Effects of Geometric Parameters on Aerodynamic Performance ...

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The KSFM Journal of Fluid Machinery: Vol. 21, No. 6, December 2018, pp.32~38(Received 18 Sep. 2018; revised 05 Oct. 2018; accepted for publication 10 Oct. 2018) 32 ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, pp.32~38, 2018(๋…ผ ๋ฌธ์ ‘์ˆ˜์ผ์ž: 2018.09.18, ๋…ผ๋ฌธ์ˆ˜์ •์ผ์ž: 2018.10.05, ์‹ฌ์‚ฌ์™„๋ฃŒ์ผ์ž: 2018.10.10) โ—Ž ๋…ผ ๋ฌธ โ—Ž Original Paper DOI: http://dx.doi.org/10.5293/kfma.2018.21.6.032 ISSN (Print): 2287-9706 ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ˜•์ƒ ๋ณ€์ˆ˜๊ฐ€ ๊ณต๋ ฅํ•™์  ์„ฑ๋Šฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ ์–‘์ƒํ˜ธ * โ‹…๊น€๊ฒฝ์—ฝ ** โ‹…ํ—ˆ๋งŒ์›… *** โ€  1) Effects of Geometric Parameters on Aerodynamic Performance of a High Pressure Axial Flow Fan Sang-Ho Yang * โ€  , Kyung-Yup Kim ** , Man-Woong Heo *** Key Words : Axial flow fan(์ถ•๋ฅ˜ํ™ด), Pitch angle(ํ”ผ์น˜๊ฐ๋„), Hub ratio(ํ—ˆ๋ธŒ ๋น„), Number of blades(๋‚ ๊ฐœ ์ˆ˜), Efficiency(ํšจ์œจ), RANS equations(๋ ˆ์ด๋†€์ฆˆ ํ‰๊ท  ๋‚˜๋น„์–ด-์Šคํ†ก์Šค ๋ฐฉ์ •์‹) ABSTRACT This study was carried out to investigate the effects of the number of rotors and stators as well as hub ratio of the rotor on the aerodynamic characteristics of a high-pressure axial flow fan using three-dimensional Reynolds-averaged Navierโ€“Stokes equations. The shear stress transport turbulence model was used for the analysis of turbulence. Finite volume method and unstructured hexahedral grids were used in the numerical analysis. An optimal grid system was selected in the computational domain through a grid-dependency test. Performance tests for the axial flow fan were conducted, and its results were compared with those of the numerical analysis . From the results of the flow analysis, it was determined that the number and hub ratio of rotor have more significant effects on the performance of high-pressure axial flow fans than the number of stator. 1. ์„œ ๋ก  ์ตœ๊ทผ ์„ธ๊ณ„ ๊ฐ๊ตญ์—์„œ๋Š” ๊ณ ์†ํ™” ์ฒ ๋„ ๋ฐ ๋„๋กœ ๋“ฑ์˜ ๊ณ ์†์šด์†ก ๊ฐœ๋ฐœ ์ˆ˜์š”๊ฐ€ ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ํ•ดํ˜‘์„ ํšก๋‹จํ•˜๋Š” ํ•ด์ €ํ„ฐ๋„์˜ ์ˆ˜ ์š”๊ฐ€ ๋น ๋ฅด๊ฒŒ ์ฆ๊ฐ€ํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ์ดˆ์žฅ๋Œ€ ํ„ฐ๋„์˜ ๋‚ด๋ถ€ ํ™˜๊ธฐ ์„ฑ ๋Šฅ์— ๋Œ€ํ•œ ์ค‘์š”์„ฑ์ด ๋Œ€๋‘๋˜๊ณ  ์žˆ๋‹ค. ๊ณ ์†์ฒ ๋„ ํ„ฐ๋„์˜ ๊ฒฝ์šฐ ์ „๋™์—ด์ฐจ์—์„œ ๋ฐœ์ƒํ•˜๋Š” ์—ด๋ถ€ํ•˜์˜ ํ™˜๊ธฐ๋Š” ๋ฌผ๋ก ์ด๊ณ  ํ„ฐ๋„์—์„œ ํ™”์žฌ ๋ฐœ์ƒ ์‹œ ๋ฐฐ์—ฐ ๋ฐ ์ œ์—ฐ์„ ํ†ตํ•ด ์ธ๋ช…ํ”ผํ•ด๋ฅผ ์ค„์ด๊ธฐ ์œ„ํ•œ ๊ณต์ต์„ค๋น„๋กœ์„œ ์ถ•๋ฅ˜ํŒฌ์˜ ์—ญํ• ์€ ๋งค์šฐ ์ค‘์š”ํ•˜๋‹ค. ํ˜„์žฌ ์„ธ๊ณ„ ์ตœ ์žฅ ํ•ด์ €ํ„ฐ๋„์€ ์˜๊ตญ-ํ”„๋ž‘์Šค๋ฅผ ์—ฐ๊ฒฐํ•˜๋Š” ์œ ๋กœํ„ฐ๋„๋กœ ํ•ด์ €๊ตฌ ๊ฐ„์˜ ์ด ๊ธธ์ด๋Š” 38 km์ด๋‹ค. 2014๋…„ 2์›” 14์ผ ์ฐจ์ด๋‚˜ ๋ฐ์ผ๋ฆฌ ๋“ฑ ์ค‘๊ตญ์˜ ์–ธ๋ก ์— ๋”ฐ๋ฅด๋ฉด ๋žด์˜ค๋‹์„ฑ ๋‹ค๋ Œ์‹œ์™€ ์‚ฐ๋‘ฅ์„ฑ ์˜Œํƒ€์ด ๋ฅผ ์—ฐ๊ฒฐํ•˜๋Š” 123 km์˜ ํ„ฐ๋„ ๊ฑด์„ค๊ณ„ํš์ด ๋ฐœํ‘œ๋˜์—ˆ๋‹ค. 2015 ~2016๋…„ ๊ณต์‚ฌ๋ฅผ ์‹œ์ž‘ํ•ด์„œ ์ด 10๋…„ ์ด๋‚ด ์™„๊ณต์„ ๋ชฉํ‘œ๋กœ ํ•ด์ € ํ„ฐ๋„์€ ์ด 3๊ฐœ์˜ ๋…ธ์„ ์œผ๋กœ ๋˜์–ด์žˆ์œผ๋ฉฐ ๊ณ ์†์ฒ ๋„๋กœ 2๊ฐœ ๋…ธ์„ , ๋‚˜๋จธ์ง€๋Š” ์˜ˆ๋น„ ๋ฐ ๋น„์ƒ์„ ๋กœ๋กœ ์ด์šฉ๋  ์˜ˆ์ •์ด๋‹ค. (1) ์ด์™€ ๊ฐ™์ด ํ„ฐ๋„์ด ์ดˆ์žฅ๋Œ€ํ™” ๋จ์— ๋”ฐ๋ผ ํ™˜๊ธฐ ๋ฐ ๋ฐฐ์—ฐ์„ ์œ„ํ•œ ๊ณ ์ •์•• ์ถ• ๋ฅ˜ํŒฌ์˜ ์„ฑ๋ŠฅํŠน์„ฑ์— ๋Œ€ํ•œ ์ดํ•ด๊ฐ€ ์š”๊ตฌ๋˜๊ณ  ์ด๋ฅผ ์œ„ํ•œ ๋‹ค์–‘ํ•œ ์—ฐ๊ตฌ๋“ค์ด ์ˆ˜ํ–‰๋˜๊ณ  ์žˆ๋‹ค. ์–‘์ƒํ˜ธ ๋“ฑ (2) ์€ ์ผ๋ฐฉํ–ฅ ์ œํŠธํ™ด์˜ ๊ณต๋ ฅํ•™์  ํŠน์„ฑ์— ๋Œ€ํ•œ ๋™ ์ต ํ”ผ์น˜๊ฐ ๋ฐ ๋””ํ“จ์ € ๊ฐ๋„์˜ ์˜ํ–ฅ์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•œ ์—ฐ๊ตฌ๋ฅผ ์ˆ˜ํ–‰ํ•˜์˜€์œผ๋ฉฐ, ์–‘์ƒํ˜ธ ๋“ฑ (3) ์€ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ’๋Ÿ‰ ๋ฐ ์••๋ ฅ ์„ ํ‰๊ฐ€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์ƒ์‚ฌ๋ฒ•์น™์„ ์ด์šฉํ•œ ์„ค๊ณ„ ๋ฐฉ๋ฒ•์„ ๊ฒ€ํ† ํ•˜ ์˜€๋‹ค. Chun ๋“ฑ (4) ์€ ํ„ฐ๋„ ๋‚ด์— ๋‹ค์ˆ˜์˜ ์ถ•๋ฅ˜ํŒฌ์„ ์„ค์น˜ํ•  ๊ฒฝ ์šฐ ์ƒํ˜ธ๊ฐ„ ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•ด ํ‰ํ–‰ํ•˜๊ฒŒ ์œ„์น˜ ํ•œ ์ถ•๋ฅ˜ํŒฌ๋“ค์˜ ์„œ์ง€(surge)์™€ ์‹ค์†(stall)์— ๋Œ€ํ•œ ์—ฐ๊ตฌ๋ฅผ ์ˆ˜ํ–‰ํ•˜์˜€๊ณ , Karki ๋“ฑ (5) ์€ ํ„ฐ๋„ ๋‚ด ํ™”์žฌ๋ฐœ์ƒ ์ƒํ™ฉ์—์„œ ์ œ ํŠธํ™ด์— ์˜ํ•œ ํ„ฐ๋„ ๋‚ด๋ถ€ ์œ ๋™ํŠน์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•ด ์ˆ˜์น˜ํ•ด ์„์„ ์ˆ˜ํ–‰ํ•˜๊ณ  ์‹คํ—˜ ๊ฒฐ๊ณผ์™€ ๋น„๊ตํ•˜์˜€๋‹ค. ๊ทธ๋ฆฌ๊ณ  Se ๋“ฑ (6) ์€ ์ˆ˜์น˜ํ•ด์„์„ ํ†ตํ•ด ์ œํŠธํ™ด์˜ ์„ค์น˜์œ„์น˜ ๋ณ€ํ™”๊ฐ€ ํ„ฐ๋„ ๋‚ด ํ™”์žฌ ์˜ ๊ตฌ์กฐ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ์กฐ์‚ฌํ•˜์˜€๋‹ค. Betta ๋“ฑ (7) ์€ ํ„ฐ๋„ ์ฒœ์ •์— ์„ค์น˜ํ•œ ์ œํŠธํ™ด์˜ ์ถœ๊ตฌ ๊ฐ๋„ ๋ณ€ํ™”๊ฐ€ ํ„ฐ๋„ ๋‚ด ํ™˜๊ธฐ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•œ ์ˆ˜์น˜ํ•ด์„์„ ์ˆ˜ํ–‰ํ•˜์˜€์œผ๋ฉฐ, Mutama์™€ Hall (8) ์€ ํ„ฐ๋„ ๋‚ด๋ถ€์— ์„ค์น˜๋œ ์ œํŠธํ™ด์˜ ๋ฒฝ์œผ๋กœ * ํ•œ๊ตญ์‚ฐ์—…๊ธฐ์ˆ ๋Œ€ํ•™๊ต ์ง€์‹๊ธฐ๋ฐ˜๊ธฐ์ˆ  โ€ง ์—๋„ˆ์ง€๋Œ€ํ•™์›, (์ฃผ)์‚ผ์›์ด์•ค๋น„ ๊ธฐ์ˆ ์—ฐ๊ตฌ์†Œ(Graduate School of Knowledge-based Technology and Energy, Korea Polytechnic University, Institute of Technology Samwon E & B Co., Ltd.) ** ํ•œ๊ตญ์‚ฐ์—…๊ธฐ์ˆ ๋Œ€ํ•™๊ต ๊ธฐ๊ณ„๊ณตํ•™๊ณผ(Department of Mechanical Engineering, Korea Polytechnic University) *** ๊ฑด์„ค๊ธฐ๊ณ„๋ถ€ํ’ˆ์—ฐ๊ตฌ์›(Korea Construction Equipment Technology Institute) โ€  ๊ต์‹ ์ €์ž, E-mail : [email protected], [email protected]

Transcript of Effects of Geometric Parameters on Aerodynamic Performance ...

Page 1: Effects of Geometric Parameters on Aerodynamic Performance ...

The KSFM Journal of Fluid Machinery: Vol. 21, No. 6, December 2018, pp.32~38(Received 18 Sep. 2018; revised 05 Oct. 2018; accepted for publication 10 Oct. 2018)32 ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, pp.32~38, 2018(๋…ผ๋ฌธ์ ‘์ˆ˜์ผ์ž: 2018.09.18, ๋…ผ๋ฌธ์ˆ˜์ •์ผ์ž: 2018.10.05, ์‹ฌ์‚ฌ์™„๋ฃŒ์ผ์ž: 2018.10.10)

โ—Ž ๋…ผ ๋ฌธโ—Ž Original Paper

DOI: http://dx.doi.org/10.5293/kfma.2018.21.6.032

ISSN (Print): 2287-9706

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ˜•์ƒ ๋ณ€์ˆ˜๊ฐ€ ๊ณต๋ ฅํ•™์  ์„ฑ๋Šฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ

์–‘์ƒํ˜ธ*

โ‹…๊น€๊ฒฝ์—ฝ**

โ‹…ํ—ˆ๋งŒ์›…***โ€ 

1)

Effects of Geometric Parameters on AerodynamicPerformance of a High Pressure Axial Flow Fan

Sang-Ho Yang*โ€ , Kyung-Yup Kim**, Man-Woong Heo***

Key Words : Axial flow fan(์ถ•๋ฅ˜ํ™ด), Pitch angle(ํ”ผ์น˜๊ฐ๋„), Hub ratio(ํ—ˆ๋ธŒ ๋น„), Number of blades(๋‚ ๊ฐœ ์ˆ˜), Efficiency(ํšจ์œจ),

RANS equations(๋ ˆ์ด๋†€์ฆˆ ํ‰๊ท  ๋‚˜๋น„์–ด-์Šคํ†ก์Šค ๋ฐฉ์ •์‹)

ABSTRACT

This study was carried out to investigate the effects of the number of rotors and stators as well as hub ratio of the rotor

on the aerodynamic characteristics of a high-pressure axial flow fan using three-dimensional Reynolds-averaged Navierโ€“Stokes

equations. The shear stress transport turbulence model was used for the analysis of turbulence. Finite volume method and

unstructured hexahedral grids were used in the numerical analysis. An optimal grid system was selected in the computational

domain through a grid-dependency test. Performance tests for the axial flow fan were conducted, and its results were compared

with those of the numerical analysis . From the results of the flow analysis, it was determined that the number and hub ratio

of rotor have more significant effects on the performance of high-pressure axial flow fans than the number of stator.

1. ์„œ ๋ก 

์ตœ๊ทผ ์„ธ๊ณ„ ๊ฐ๊ตญ์—์„œ๋Š” ๊ณ ์†ํ™” ์ฒ ๋„ ๋ฐ ๋„๋กœ ๋“ฑ์˜ ๊ณ ์†์šด์†ก

๊ฐœ๋ฐœ ์ˆ˜์š”๊ฐ€ ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ํ•ดํ˜‘์„ ํšก๋‹จํ•˜๋Š” ํ•ด์ €ํ„ฐ๋„์˜ ์ˆ˜

์š”๊ฐ€ ๋น ๋ฅด๊ฒŒ ์ฆ๊ฐ€ํ•˜๊ณ  ์žˆ์œผ๋ฉฐ, ์ดˆ์žฅ๋Œ€ ํ„ฐ๋„์˜ ๋‚ด๋ถ€ ํ™˜๊ธฐ ์„ฑ

๋Šฅ์— ๋Œ€ํ•œ ์ค‘์š”์„ฑ์ด ๋Œ€๋‘๋˜๊ณ  ์žˆ๋‹ค. ๊ณ ์†์ฒ ๋„ ํ„ฐ๋„์˜ ๊ฒฝ์šฐ

์ „๋™์—ด์ฐจ์—์„œ ๋ฐœ์ƒํ•˜๋Š” ์—ด๋ถ€ํ•˜์˜ ํ™˜๊ธฐ๋Š” ๋ฌผ๋ก ์ด๊ณ  ํ„ฐ๋„์—์„œ

ํ™”์žฌ ๋ฐœ์ƒ ์‹œ ๋ฐฐ์—ฐ ๋ฐ ์ œ์—ฐ์„ ํ†ตํ•ด ์ธ๋ช…ํ”ผํ•ด๋ฅผ ์ค„์ด๊ธฐ ์œ„ํ•œ

๊ณต์ต์„ค๋น„๋กœ์„œ ์ถ•๋ฅ˜ํŒฌ์˜ ์—ญํ• ์€ ๋งค์šฐ ์ค‘์š”ํ•˜๋‹ค. ํ˜„์žฌ ์„ธ๊ณ„ ์ตœ

์žฅ ํ•ด์ €ํ„ฐ๋„์€ ์˜๊ตญ-ํ”„๋ž‘์Šค๋ฅผ ์—ฐ๊ฒฐํ•˜๋Š” ์œ ๋กœํ„ฐ๋„๋กœ ํ•ด์ €๊ตฌ

๊ฐ„์˜ ์ด ๊ธธ์ด๋Š” 38km์ด๋‹ค. 2014๋…„ 2์›” 14์ผ ์ฐจ์ด๋‚˜ ๋ฐ์ผ๋ฆฌ

๋“ฑ ์ค‘๊ตญ์˜ ์–ธ๋ก ์— ๋”ฐ๋ฅด๋ฉด ๋žด์˜ค๋‹์„ฑ ๋‹ค๋ Œ์‹œ์™€ ์‚ฐ๋‘ฅ์„ฑ ์˜Œํƒ€์ด

๋ฅผ ์—ฐ๊ฒฐํ•˜๋Š” 123 km์˜ ํ„ฐ๋„ ๊ฑด์„ค๊ณ„ํš์ด ๋ฐœํ‘œ๋˜์—ˆ๋‹ค. 2015

~2016๋…„ ๊ณต์‚ฌ๋ฅผ ์‹œ์ž‘ํ•ด์„œ ์ด 10๋…„ ์ด๋‚ด ์™„๊ณต์„ ๋ชฉํ‘œ๋กœ ํ•ด์ €

ํ„ฐ๋„์€ ์ด 3๊ฐœ์˜ ๋…ธ์„ ์œผ๋กœ ๋˜์–ด์žˆ์œผ๋ฉฐ ๊ณ ์†์ฒ ๋„๋กœ 2๊ฐœ ๋…ธ์„ ,

๋‚˜๋จธ์ง€๋Š” ์˜ˆ๋น„ ๋ฐ ๋น„์ƒ์„ ๋กœ๋กœ ์ด์šฉ๋  ์˜ˆ์ •์ด๋‹ค.(1) ์ด์™€ ๊ฐ™์ด

ํ„ฐ๋„์ด ์ดˆ์žฅ๋Œ€ํ™” ๋จ์— ๋”ฐ๋ผ ํ™˜๊ธฐ ๋ฐ ๋ฐฐ์—ฐ์„ ์œ„ํ•œ ๊ณ ์ •์•• ์ถ•

๋ฅ˜ํŒฌ์˜ ์„ฑ๋ŠฅํŠน์„ฑ์— ๋Œ€ํ•œ ์ดํ•ด๊ฐ€ ์š”๊ตฌ๋˜๊ณ  ์ด๋ฅผ ์œ„ํ•œ ๋‹ค์–‘ํ•œ

์—ฐ๊ตฌ๋“ค์ด ์ˆ˜ํ–‰๋˜๊ณ  ์žˆ๋‹ค.

์–‘์ƒํ˜ธ ๋“ฑ(2)์€ ์ผ๋ฐฉํ–ฅ ์ œํŠธํ™ด์˜ ๊ณต๋ ฅํ•™์  ํŠน์„ฑ์— ๋Œ€ํ•œ ๋™

์ต ํ”ผ์น˜๊ฐ ๋ฐ ๋””ํ“จ์ € ๊ฐ๋„์˜ ์˜ํ–ฅ์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•œ ์—ฐ๊ตฌ๋ฅผ

์ˆ˜ํ–‰ํ•˜์˜€์œผ๋ฉฐ, ์–‘์ƒํ˜ธ ๋“ฑ(3)์€ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ’๋Ÿ‰ ๋ฐ ์••๋ ฅ

์„ ํ‰๊ฐ€ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์ƒ์‚ฌ๋ฒ•์น™์„ ์ด์šฉํ•œ ์„ค๊ณ„ ๋ฐฉ๋ฒ•์„ ๊ฒ€ํ† ํ•˜

์˜€๋‹ค. Chun ๋“ฑ(4)

์€ ํ„ฐ๋„ ๋‚ด์— ๋‹ค์ˆ˜์˜ ์ถ•๋ฅ˜ํŒฌ์„ ์„ค์น˜ํ•  ๊ฒฝ

์šฐ ์ƒํ˜ธ๊ฐ„ ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•ด ํ‰ํ–‰ํ•˜๊ฒŒ ์œ„์น˜

ํ•œ ์ถ•๋ฅ˜ํŒฌ๋“ค์˜ ์„œ์ง€(surge)์™€ ์‹ค์†(stall)์— ๋Œ€ํ•œ ์—ฐ๊ตฌ๋ฅผ

์ˆ˜ํ–‰ํ•˜์˜€๊ณ , Karki ๋“ฑ(5)

์€ ํ„ฐ๋„ ๋‚ด ํ™”์žฌ๋ฐœ์ƒ ์ƒํ™ฉ์—์„œ ์ œ

ํŠธํ™ด์— ์˜ํ•œ ํ„ฐ๋„ ๋‚ด๋ถ€ ์œ ๋™ํŠน์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•ด ์ˆ˜์น˜ํ•ด

์„์„ ์ˆ˜ํ–‰ํ•˜๊ณ  ์‹คํ—˜ ๊ฒฐ๊ณผ์™€ ๋น„๊ตํ•˜์˜€๋‹ค. ๊ทธ๋ฆฌ๊ณ  Se ๋“ฑ(6)

์€

์ˆ˜์น˜ํ•ด์„์„ ํ†ตํ•ด ์ œํŠธํ™ด์˜ ์„ค์น˜์œ„์น˜ ๋ณ€ํ™”๊ฐ€ ํ„ฐ๋„ ๋‚ด ํ™”์žฌ

์˜ ๊ตฌ์กฐ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ์กฐ์‚ฌํ•˜์˜€๋‹ค. Betta ๋“ฑ(7)์€ ํ„ฐ๋„

์ฒœ์ •์— ์„ค์น˜ํ•œ ์ œํŠธํ™ด์˜ ์ถœ๊ตฌ ๊ฐ๋„ ๋ณ€ํ™”๊ฐ€ ํ„ฐ๋„ ๋‚ด ํ™˜๊ธฐ์—

๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•œ ์ˆ˜์น˜ํ•ด์„์„ ์ˆ˜ํ–‰ํ•˜์˜€์œผ๋ฉฐ,

Mutama์™€ Hall(8)

์€ ํ„ฐ๋„ ๋‚ด๋ถ€์— ์„ค์น˜๋œ ์ œํŠธํ™ด์˜ ๋ฒฝ์œผ๋กœ

* ํ•œ๊ตญ์‚ฐ์—…๊ธฐ์ˆ ๋Œ€ํ•™๊ต ์ง€์‹๊ธฐ๋ฐ˜๊ธฐ์ˆ  โ€ง ์—๋„ˆ์ง€๋Œ€ํ•™์›, (์ฃผ)์‚ผ์›์ด์•ค๋น„ ๊ธฐ์ˆ ์—ฐ๊ตฌ์†Œ(Graduate School of Knowledge-based Technology

and Energy, Korea Polytechnic University, Institute of Technology Samwon E & B Co., Ltd.)

** ํ•œ๊ตญ์‚ฐ์—…๊ธฐ์ˆ ๋Œ€ํ•™๊ต ๊ธฐ๊ณ„๊ณตํ•™๊ณผ(Department of Mechanical Engineering, Korea Polytechnic University)

*** ๊ฑด์„ค๊ธฐ๊ณ„๋ถ€ํ’ˆ์—ฐ๊ตฌ์›(Korea Construction Equipment Technology Institute)

โ€  ๊ต์‹ ์ €์ž, E-mail : [email protected], [email protected]

Page 2: Effects of Geometric Parameters on Aerodynamic Performance ...

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ˜•์ƒ ๋ณ€์ˆ˜๊ฐ€ ๊ณต๋ ฅํ•™์  ์„ฑ๋Šฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ

ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, 2018 33

DescriptionsDesign

specificationsTest results

Diameter of impeller, mm 1992 1992

Tip clearance, mm 4 4

Blade tip angle, deg. 23 23

Hub ratio, % 56 56

Air volume, m3/min 5,220 5,251

Total pressure, mmAq 287 292

Rotational speed, r/mim 1,185 1,185

Shaft power, kW 302 301.5

Total pressure efficiency, % >81 >83.1

Motor power, kW(Poles) 390(6) 390(6)

Number of blades, EA 16 16

Number of stator, EA 17 17

Table 1 Design specifications and test results of the prototype

axial flow fan

Fig. 1 ฯ†2000 x 390 kW prototype axial flow fan

Fig. 2 Axial flow fan performance test duct (by KS B 6311)

Fig. 3 ฯ†2000 x 390kW prototype axial flow fan actual test scene

๋ถ€ํ„ฐ์˜ ๊ฑฐ๋ฆฌ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ํ„ฐ๋„ ๋‚ด์˜ ์œ ๋™ ํŠน์„ฑ์„ ๋ถ„์„ํ•˜์˜€

๋‹ค. ๋˜ํ•œ, ์„œ์ค€์› ๋“ฑ(9)์€ 2๋‹จ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์— ๋Œ€ํ•ด ์ˆ˜์น˜ํ•ด

์„์„ ํ†ตํ•ด ์„ฑ๋Šฅํ‰๊ฐ€ ๋ฐ ๋‚ด๋ถ€ ์œ ๋™์žฅ ๋ถ„์„์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

์ด์™€ ๊ฐ™์ด ํ„ฐ๋„ ๋‚ด ํ™˜๊ธฐ ๋ฐ ๋ฐฐ์—ฐ์„ ์œ„ํ•ด ์‚ฌ์šฉ๋˜๋Š” ์ถ•๋ฅ˜ํŒฌ

์— ๋Œ€ํ•œ ๋‹ค์–‘ํ•œ ์—ฐ๊ตฌ๋“ค์ด ์ˆ˜ํ–‰๋˜๊ณ  ์žˆ์ง€๋งŒ, ๊ตญ๋‚ด์—์„œ๋Š” 30

km ์ด์ƒ ์ดˆ์žฅ๋Œ€ ํ•ด์ €ํ„ฐ๋„์˜ ํ™˜๊ธฐ ๋ฐ ์ œ์—ฐ๊ธฐ๋Šฅ์„ ์ˆ˜ํ–‰ ํ•  ์ˆ˜

์žˆ๋Š” 4.0kPa ์ด์ƒ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ์„ฑ๋ŠฅํŠน์„ฑ์„ ์ดํ•ดํ•˜๊ธฐ ์œ„

ํ•œ ์ฒด๊ณ„์ ์ธ ์—ฐ๊ตฌ๋Š” ๋ฏธ๋ฏธํ•œ ์‹ค์ •์ด๋‹ค. 4.0kPa ์ด์ƒ ๊ณ ์„ฑ๋Šฅ

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์„ ์„ค๊ณ„ํ•˜๊ธฐ ์œ„ํ•ด์„œ๋Š” ์ฒด๊ณ„์ ์ธ ๋ถ„์„์ด ์ด๋ฃจ

์–ด์ ธ์•ผ ํ•œ๋‹ค.

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ ์‹œ์ œํ’ˆ์˜ ์„ฑ๋Šฅ์‹œํ—˜ ๊ฒฐ๊ณผ๋ฅผ

๋ฐ”ํƒ•์œผ๋กœ ์œ ๋™ํ•ด์„์„ ์‹ค์‹œํ•˜์—ฌ ๊ณต๋ ฅ์„ฑ๋Šฅ์„ ํ™•์ธํ•˜์˜€๊ณ , ๊ณ ์ •

์•• ์ถ•๋ฅ˜ํŒฌ์˜ ๋™์ต(rotor) ๋ฐ ์ •์ต(stator)์˜ ๋‚ ๊ฐœ ์ˆ˜, ๊ทธ๋ฆฌ๊ณ 

ํ—ˆ๋ธŒ ๋น„(hub ratio) ๋ณ€ํ™”๊ฐ€ ๊ณต๋ ฅํ•™์  ์„ฑ๋Šฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ๋ถ„

์„ํ•˜์˜€๋‹ค. ์œ ๋™ํŠน์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์‚ผ์ฐจ์› Reynolds-

averaged Navier- Stokes (RANS) ํ•ด์„์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค.

2. ์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ์˜ ์ œ์› ๋ฐ ์„ฑ๋Šฅ์‹œํ—˜

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” 4.0 kPa ์ด์ƒ ์ „์••๋ ฅ ์„ฑ๋Šฅ์„ ๊ฐ–๋Š” ์‹ค ์†กํ’

๊ธฐ(full scale actual fan)์˜ ์ง๊ฒฝ ฯ† 3,200 ๋Œ€๋น„ 62.5% ์˜ ์ถ•

์†Œ ๋ชจ๋ธ๋กœ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์„ ์„ค๊ณ„ํ•˜์˜€๋‹ค. ์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ์€

ฯ† 2,000 , ํŒ ๊ฐ๋„ 23 ยฐ, ๋™๋ ฅ 390kW, ๋‚ ๊ฐœ ๋งค์ˆ˜ 16, ๊ทธ๋ฆฌ๊ณ 

ํšŒ์ „์ˆ˜ 1185 rpm์ด๋ฉฐ ํ† ์ถœ ์ธก์— ์ง๊ฒฝ 2500mm์˜ ํ™•์‚ฐ๊ด€์„

๋ถ€์ฐฉํ•œ ํ˜•์ƒ์ด๋ฉฐ, KS B 6311 ์†กํ’๊ธฐ ์‹œํ—˜๋ฐฉ๋ฒ• ๊ทœ์ •์˜ ํ† ์ถœ

๋•ํŠธ ์‹œํ—˜๋ฐฉ๋ฒ•์— ์˜ํ•ด ์„ฑ๋Šฅ์‹œํ—˜์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค. ์„ฑ๋Šฅ์‹œํ—˜ ๊ฒฐ

๊ณผ ํ’๋Ÿ‰ 5,251m3/min, ์ „์••๋ ฅ(total pressure) 292mmAq,

์ถ•๋™๋ ฅ 301.5 kW, ์ „์••ํšจ์œจ(total pressure efficiency)์€

83.1 %์ด๋ฉฐ, ๋ฒ ์–ด๋ง ์ง„๋™์€ 2.5mm/s๏ฝž3.1mm/s(rms)์˜ ๊ฒฐ

๊ณผ๋ฅผ ์–ป์—ˆ๊ณ  ์ž์„ธํ•œ ์‚ฌํ•ญ์€ Table 1์— ์ •๋ฆฌํ•˜์˜€๋‹ค. Fig. 1์—

์ถ•์†Œ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ ์‹œ์ œํ’ˆ ์™ธ๊ด€ ํ˜•์ƒ์„ ๋‚˜ํƒ€๋‚ด์—ˆ๊ณ , ์ถ•๋ฅ˜ํŒฌ์˜

๊ณต๋ ฅ์„ฑ๋Šฅ ์„ฑ๋Šฅ์‹œํ—˜ ์žฅ์น˜๋Š” Fig. 2์™€ ๊ฐ™์€ ํ˜•์ƒ์œผ๋กœ KS B

6311 ๊ทœ์ •์— ๋”ฐ๋ผ ์ œ์ž‘ํ•˜์˜€๋‹ค.

Fig. 3์€ ฯ† 2,000ร—390kW ์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ ์‹œ์ œํ’ˆ์˜ ์‹ค๋ถ€

ํ•˜ ์„ฑ๋Šฅ์‹œํ—˜ ๊ด‘๊ฒฝ์„ ๋ณด์—ฌ์ค€๋‹ค.

์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ์˜ ์„ฑ๋Šฅ์‹œํ—˜์—์„œ ์–ป์–ด์ง„ ์„ฑ๋Šฅ์€ AMCA

802 ๊ทœ์ •์— ๋”ฐ๋ผ ์‹ค ์†กํ’๊ธฐ์˜ ์„ฑ๋Šฅ์œผ๋กœ ํ™˜์‚ฐ ํ•  ์ˆ˜ ์žˆ๋‹ค. ์ถ•

๋ฅ˜ํŒฌ์˜ ์ง๊ฒฝ์„ ฯ†3,200, ํšŒ์ „์ˆ˜ 885 r/min์œผ๋กœ ํ•˜์—ฌ ์„ฑ๋Šฅ์„

ํ™˜์‚ฐ ํ•  ๊ฒฝ์šฐ ํ’๋Ÿ‰ 16,063 m3/min, ์ „์••(total pressure)

417mmAq, ์ถ•๋™๋ ฅ 1,317 kW, ์ „์••ํšจ์œจ(total pressure

efficiency)์€ 83.1% ์ด์ƒ์˜ ์„ฑ๋Šฅ์„ ์–ป์„ ์ˆ˜ ์žˆ๋‹ค.

3. ์œ ๋™ํ•ด์„๋ฐฉ๋ฒ•

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ํ•ด์ €ํ„ฐ๋„์šฉ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ๋™์ต ๋ฐ ์ •์ต

์˜ ๊ฐœ์ˆ˜ ๊ทธ๋ฆฌ๊ณ  ํ—ˆ๋ธŒ ๋น„์˜ ๋ณ€ํ™”๊ฐ€ ๊ณต๋ ฅํ•™์  ํŠน์„ฑ์— ๋ฏธ์น˜๋Š”

์˜ํ–ฅ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์œ ๋™์žฅ์„ ๋น„์••์ถ•์„ฑ ์‚ผ์ฐจ์› ์ •์ƒ ์ƒ

Page 3: Effects of Geometric Parameters on Aerodynamic Performance ...

์–‘์ƒํ˜ธโ‹…๊น€๊ฒฝ์—ฝโ‹…ํ—ˆ๋งŒ์›…

34 ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, 2018

Fig. 4 Computational domain of an axial flow fan

Fig. 5 Structure of grid system

Fig. 6 Comparison between experimental data and CFD results

ํƒœ๋กœ ๊ฐ€์ •ํ•˜๊ณ  ์ƒ์šฉ CFD ์ฝ”๋“œ์ธ ANSYS CFX 17.010์„ ์‚ฌ์šฉ

ํ•˜์—ฌ ์ •๋ฐ€ ์œ ๋™ํ•ด์„์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค. ๋ณธ ์—ฐ๊ตฌ ๋Œ€์ƒ์ธ ๊ณ ์ •์••

์ถ•๋ฅ˜ํŒฌ์˜ ์œ ๋™ํ•ด์„์„ ์œ„ํ•œ ๊ณ„์‚ฐ์˜์—ญ์€ Fig. 4์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์€ ์ž…๊ตฌ ์•ˆ๋‚ด ๊นƒ(Inlet guide vane), ๋™์ต,

๊ทธ๋ฆฌ๊ณ  ์ •์ต์œผ๋กœ ๊ตฌ์„ฑ๋˜๋ฉฐ, ๊ณ„์‚ฐ์˜์—ญ์€ ํšŒ์ „์˜์—ญ(๋™์ต)๊ณผ ์ •

์ง€์˜์—ญ(์ž…๊ตฌ๋ถ€ ๋ฒจ๋งˆ์šฐ์Šค, ์ž…๊ตฌ ์•ˆ๋‚ด ๊นƒ, ์ •์ต, ๊ทธ๋ฆฌ๊ณ  ํ† ์ถœ

ํ™•์‚ฐ๊ด€)์„ ๊ตฌ๋ถ„ํ•˜์—ฌ ์ •์˜ํ•˜์˜€๋‹ค. ๊ธฐ์ค€ํ˜•์ƒ์˜ ์ถ•๋ฅ˜ํŒฌ์€ 16๋งค

์˜ ๋™์ต๊ณผ 17๋งค์˜ ์ •์ต์„ ๊ฐ€์ง€๋ฉฐ, ์ž„ํŽ ๋Ÿฌ์˜ ์ง๊ฒฝ์€ 1,992

mm, ํŒ ๊ฐ„๊ทน(tip clearance)์€ 4mm์ด๋‹ค.

๋™์ต์€ 1,185 r/min์˜ ์†๋„๋กœ ํšŒ์ „ํ•˜๋ฉฐ, ํ—ˆ๋ธŒ ๋น„๋Š” 0.56

์ด๋‹ค. ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์— ๋Œ€ํ•œ ์ž์„ธํ•œ ์„ค๊ณ„์‚ฌ์–‘ ๋ฐ ์‹œํ—˜๊ฒฐ๊ณผ๋Š”

Table 1์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

์œ ๋™ํ•ด์„์„ ์œ„ํ•ด ์ž‘๋™์œ ์ฒด๋Š” ํ‘œ์ค€์ƒํƒœ์˜ 25โ„ƒ ๊ณต๊ธฐ๋กœ ๊ฐ€

์ •ํ•˜์˜€์œผ๋ฉฐ, ๊ณ„์‚ฐ ์˜์—ญ์˜ ์ž…๊ตฌ์™€ ์ถœ๊ตฌ์—๋Š” ๊ฐ๊ฐ ์ „์••๋ ฅ(total

pressure)๊ณผ ์œ ๋Ÿ‰ ๊ฒฝ๊ณ„์กฐ๊ฑด์„ ์ ์šฉํ•˜์˜€๋‹ค. ํšŒ์ „์˜์—ญ๊ณผ ๊ณ ์ •์˜

์—ญ ์‚ฌ์ด์˜ ๊ฒฝ๊ณ„๋ฉด ์ฒ˜๋ฆฌ๋Š” stage interface ๊ธฐ๋ฒ•์„ ์ ์šฉํ•˜์˜€

๊ณ , ๋ชจ๋“  ๋ฒฝ๋ฉด์—๋Š” ์ ์ฐฉ์กฐ๊ฑด(no-slip condition)์„ ์ ์šฉํ•˜์˜€

๋‹ค. ๋‚œ๋ฅ˜ํ•ด์„์„ ์œ„ํ•ด์„œ๋Š” SST(shear stress transport) k-ฯ‰

๋‚œ๋ฅ˜๋ชจ๋ธ์„ ์‚ฌ์šฉํ•˜์˜€๋‹ค. SST ๋ชจ๋ธ์€ k-ฯ‰ ๋ชจ๋ธ๊ณผ k-ฮต ๋ชจ๋ธ

์˜ ์žฅ์ ๋งŒ์„ ๊ฒฐํ•ฉํ•œ ๊ฒƒ์œผ๋กœ ๋ฒฝ ๊ทผ์ฒ˜ ์˜์—ญ์—๋Š” k-ฯ‰ ๋ชจ๋ธ์„

์‚ฌ์šฉํ•˜๊ณ  ๋ฒฝ ๊ทผ์ฒ˜๋ฅผ ์ œ์™ธํ•œ ์˜์—ญ์—์„œ๋Š” k-ฮต ๋ชจ๋ธ์„ ์‚ฌ์šฉํ•˜

๊ฒŒ ๋œ๋‹ค.

๋ณธ ์—ฐ๊ตฌ์˜ ์ˆ˜์น˜ํ•ด์„์„ ์œ„ํ•œ ๊ณ„์‚ฐ์˜์—ญ์— ๋Œ€ํ•œ ๊ฒฉ์ž๊ณ„๋Š”

Fig. 5์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๊ณ„์‚ฐ์˜ ๊ฒฝ์ œ์„ฑ์„ ๊ณ ๋ คํ•˜์—ฌ ๋™์ต๊ณผ ์ •

์ต์€ ๋‹จ์ผ ์œ ๋กœ(single passage)๋งŒ์„ ๊ณ ๋ คํ•˜์—ฌ ๊ฒฉ์ž๋ฅผ ์ƒ์„ฑ

ํ•˜๊ณ  ํšŒ์ „๋ฐฉํ–ฅ์œผ๋กœ ์ฃผ๊ธฐ์กฐ๊ฑด(rotational periodicity interface

method)์„ ์ฃผ์–ด ๊ณ„์‚ฐํ•˜์˜€๋‹ค. ๊ณ„์‚ฐ์˜์—ญ์€ ์œก๋ฉด์ฒด ๊ฒฉ์ž๋ฅผ ์‚ฌ

์šฉํ•˜์—ฌ ๊ตฌ์„ฑํ•˜์˜€์œผ๋ฉฐ, ๋ฒฝ๋ฉด ์ฒซ ๋ฒˆ์งธ ๊ฒฉ์ž์ ์—์„œ์˜ y+๊ฐ’์ด 2

์ดํ•˜๋กœ ์œ ์ง€๋˜๋„๋ก ํ•˜์˜€๋‹ค. ๋˜ํ•œ, ๊ณ„์‚ฐ ๊ฒฐ๊ณผ์— ๋Œ€ํ•œ ๊ฒฉ์ž์˜

์˜์กด์„ฑ์„ ๋ฐฐ์ œ์‹œํ‚ค๊ธฐ ์œ„ํ•˜์—ฌ ์ˆ˜ํ–‰ํ•œ ๊ฒฉ์ž์˜์กด์„ฑ์‹œํ—˜์„ ๊ฒฉ์ž

์ˆ˜ 1,000,000~25,000,000๊ฐœ ๋ฒ”์œ„์—์„œ ๋ณ€ํ™”์‹œ์ผœ ๋น„๊ตํ•˜์˜€

์œผ๋ฉฐ, ์•ฝ 2,200,000๊ฐœ์˜ ๊ฒฉ์ž ์ˆ˜ ์ด์ƒ์—์„œ ๊ณ„์‚ฐ ๊ฒฐ๊ณผ์˜ ์ฐจ

์ด๋ฅผ ๋ณด์ด์ง€ ์•Š์•„ ์ˆ˜์น˜ํ•ด์„์„ ์œ„ํ•œ ์ตœ์ ์˜ ๊ฒฉ์žํฌ๊ธฐ๋กœ ๊ฒฐ์ •

ํ•˜์˜€๋‹ค. ๋ชจ๋“  ํ•ด์„์€ ์งˆ๋Ÿ‰๋ณด์กด๋ฐฉ์ •์‹์˜ RMS(root mean

square) ์ž‰์—ฌ๊ฐ’(residual)์ด 10E-6 ์ดํ•˜๊ฐ€ ๋˜์—ˆ์„ ๋•Œ ๋งŒ์กฑ

์Šค๋Ÿฌ์šด ์ˆ˜๋ ด ๊ฐ’์„ ๋„์ถœํ•  ์ˆ˜ ์žˆ์—ˆ๋‹ค.

4. ๊ฒฐ๊ณผ ๋ฐ ๊ฒ€ํ† 

4.1 ์„ฑ๋Šฅ์‹œํ—˜ ๊ฒฐ๊ณผ ๋น„๊ต

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์— ๋Œ€ํ•œ ์ˆ˜์น˜ํ•ด์„ ๊ฒฐ๊ณผ์˜ ์‹ ๋ขฐ์„ฑ์„ ๊ฒ€์ฆํ•˜

๊ธฐ ์œ„ํ•˜์—ฌ ์œ ๋™ํ•ด์„ ๊ฒฐ๊ณผ์™€ ์„ฑ๋Šฅ์‹œํ—˜ ๊ฒฐ๊ณผ๋ฅผ ๋น„๊ตํ•˜์—ฌ Fig.

6์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค.

์„ค๊ณ„์ ์—์„œ์˜ ํšจ์œจ ๊ฐ’์„ ๋น„๊ตํ•˜๋ฉด ์ˆ˜์น˜ํ•ด์„ ๊ฒฐ๊ณผ์™€ ์‹คํ—˜

๊ฐ’์€ ์•ฝ 0.5%์˜ ์˜ค์ฐจ๋ฅผ ๋ณด์ด๋ฉฐ ์ž˜ ์ผ์น˜ํ•˜์˜€๋‹ค. ๋˜ํ•œ ์ˆ˜์น˜ํ•ด

์„ ๊ฒฐ๊ณผ๋Š” ์•ฝ 5.8% ๊ฐ์†Œํ•œ ์ „์••๋ ฅ ๊ฐ’์„ ์˜ˆ์ธกํ•˜์˜€์œผ๋ฉฐ, ์„ฑ๋Šฅ

๊ณก์„ ์—์„œ ์ •์„ฑ์ ์œผ๋กœ ์ž˜ ์ผ์น˜ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€๋‹ค.

4.2 ๋™์ต ๋‚ ๊ฐœ ์ˆ˜์˜ ์˜ํ–ฅ์„ฑ ๋ถ„์„

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ๊ณต๋ ฅํ•™์  ํŠน์„ฑ์— ๋Œ€ํ•œ ๋™

์ต ๋‚ ๊ฐœ ์ˆ˜(Nr)์˜ ์˜ํ–ฅ์„ฑ์„ ์กฐ์‚ฌํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์‚ผ์ฐจ์› ์ •๋ฐ€ ์œ 

๋™ํ•ด์„์„ ์ˆ˜ํ–‰ํ•˜์˜€๋‹ค. Nr์„ 7~16๋งค๋กœ ๋ณ€๊ฒฝ์‹œ์ผœ ์‹(1)๊ณผ ๊ฐ™

์ด ์„ฑ๋Šฅํ•จ์ˆ˜๋กœ์„œ ์ •์˜ํ•œ ์ถ•๋ฅ˜ํŒฌ์˜ ํšจ์œจ(efficiency, ฮท) ๋ฐ ์ „

์••๋ ฅ์„ ๋น„๊ตํ•˜์˜€๋‹ค.

โˆ™

โˆˆโˆ™

(1)

์—ฌ๊ธฐ์„œ, P, Q, ฯ„ ๊ทธ๋ฆฌ๊ณ  ฯ‰๋Š” ๊ฐ๊ฐ ์ „์••๋ ฅ, ์œ ๋Ÿ‰, ํ† ํฌ, ๊ฐ

์†๋„๋ฅผ ์˜๋ฏธํ•œ๋‹ค.

Page 4: Effects of Geometric Parameters on Aerodynamic Performance ...

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ˜•์ƒ ๋ณ€์ˆ˜๊ฐ€ ๊ณต๋ ฅํ•™์  ์„ฑ๋Šฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ

ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, 2018 35

Fig. 9 Pressure contours on 50% span for the different Nr

Fig. 7 Efficiency for the different number of rotor blades

Fig. 8 Total pressure for the different number of rotor blades

Nr ์˜ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ์ถ•๋ฅ˜ํŒฌ ํšจ์œจ ๊ฐ’์˜ ๋ณ€ํ™”๋ฅผ Fig. 7์— ๋‚˜

ํƒ€๋‚ด์—ˆ๋‹ค. Nr ์ด ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ํšจ์œจ์€ ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด

์ด๋ฉฐ, Nr ์ด 14๋งค ์ด์ƒ์—์„œ๋Š” ํšจ์œจ์ด ๋น„์Šทํ•œ ๊ฐ’์„ ๋ณด์˜€๋‹ค.

์ „์••๋ ฅ์˜ ๊ฒฝ์šฐ, Fig. 8์— ๋‚˜ํƒ€๋‚ธ ๊ฒƒ๊ณผ ๊ฐ™์ด Nr ์ด 7๋งค ์—์„œ

16๋งค๋กœ ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ์ „์••๋ ฅ๋„ ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€๋‹ค.

Fig. 9๋Š” Nr ์˜ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ๋™์ต๊ณผ ์ •์ต์˜ 50% span์—์„œ์˜

์••๋ ฅ๋ถ„ํฌ๋ฅผ ๋น„๊ตํ•ด ๋ณด์—ฌ์ค€๋‹ค. Nr ๊ฐ€ 7๋งค์ผ ๊ฒฝ์šฐ์—๋Š” ๋™์ต์˜

ํก์ž…๋ฉด(suction surface)์—์„œ ๋งค์šฐ ๋‚ฎ์€ ์••๋ ฅ๋ถ„ํฌ๊ฐ€ ๋„“๊ฒŒ ๋ถ„

ํฌํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ด๋Ÿฌํ•œ ๋‚ฎ์€ ์••๋ ฅ๋ถ„ํฌ๋Š” Nr

์ด ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ์ค„์–ด๋“œ๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ, ์ •์ต

์˜ ์••๋ ฅ๋ฉด(pressure surface)์—์„œ๋„ Nr ์ด ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ์ •

์••์ด ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์ธ๋‹ค. ์ด์— ๋”ฐ๋ผ ์ถ•๋ฅ˜ํŒฌ์˜ ์ „์••๋ ฅ์ด

์ฆ๊ฐ€ํ•˜๊ณ  ํšจ์œจ ๊ฐ’์ด ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค.

4.3 ์ •์ต ๋‚ ๊ฐœ ์ˆ˜์˜ ์˜ํ–ฅ์„ฑ ๋ถ„์„

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ์ •์ต ๋‚ ๊ฐœ ์ˆ˜(Ns)์˜ ๋ณ€ํ™”์— ๋”ฐ๋ฅธ ํšจ์œจ ๋ฐ

์ „์••๋ ฅ์˜ ๋ณ€ํ™”๋ฅผ Figs. 10๊ณผ 11์— ๊ฐ๊ฐ ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ํšจ์œจ

์˜ ๊ฒฝ์šฐ, Ns ๊ฐ€ 15๋งค์—์„œ ๊ฐ€์žฅ ๋†’์€ ํšจ์œจ ๊ฐ’์„ ๋ณด์˜€์œผ๋ฉฐ, Ns

๊ฐ€ 15๋งค ์ด์ƒ์ผ ๋•Œ๋Š” ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ํšจ์œจ ๊ฐ’์ด ๊ฐ์†Œํ•˜๋Š” ๊ฒฝ

ํ–ฅ์„ ๋ณด์˜€๋‹ค. ์ „์••๋ ฅ๋„ Ns ๊ฐ€ 15๋งค์—์„œ ๊ฐ€์žฅ ํฐ ๊ฐ’์„ ๋ณด์˜€์œผ

๋ฉฐ, 15๋งค ์ด์ƒ์—์„œ ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์ธ๋‹ค.

๊ทธ๋Ÿฌ๋‚˜ Ns์˜ ๋ณ€ํ™”์— ๋”ฐ๋ผ ํšจ์œจ๊ณผ ์ „์••๋ ฅ์˜ ๋ณ€ํ™”๋Š” Nr ์˜

๋ณ€ํ™”์— ๋น„๊ตํ•˜๋ฉด ํฌ์ง€ ์•Š์€ ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค. ์ด์— ๋”ฐ๋ผ ๊ณ ์ •

์•• ์ถ•๋ฅ˜ํŒฌ์˜ ์„ฑ๋Šฅ์€ Ns ์™€ ๋น„๊ตํ•˜์—ฌ Nr ์— ๋Œ€ํ•ด ๋”์šฑ ๋ฏผ๊ฐํ•˜

๊ฒŒ ์˜ํ–ฅ์„ ๋ฐ›๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์—ˆ๋‹ค.

Ns ์˜ ๋ณ€ํ™”๊ฐ€ ์†๋„์žฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ 50

% span์—์„œ์˜ ์†๋„์žฅ์„ Fig. 12์— ํ‘œ์‹œํ•˜์˜€๋‹ค. Ns ๊ฐ€ 11๋งค

์ผ ๊ฒฝ์šฐ, ์ •์ต์˜ ํ›„๋‹จ์— ๋‚ฎ์€ ์†๋„๋ฅผ ๊ฐ–๋Š” ์˜์—ญ์ด ๋„“๊ฒŒ ๋ถ„ํฌ

ํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค. Ns ๊ฐ€ ์ฆ๊ฐํ•จ์— ๋”ฐ๋ผ ์ด๋Ÿฌํ•œ ๋‚ฎ์€

์†๋„ ๋ถ„ํฌ ์˜์—ญ์€ ์ค„์–ด๋“œ๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€์ง€๋งŒ ์ •์ต์˜ ์••๋ ฅ๋ฉด

์— ๋‚ฎ์€ ์†๋„ ์˜์—ญ์ด ๋ถ„ํฌํ•˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•˜์˜€๋‹ค. Ns ์˜ ๋ณ€ํ™”

๊ฐ€ ์ •์ต ํ›„๋‹จ ๋ฐ ์••๋ ฅ๋ฉด์˜ ์œ ๋™์žฅ์— ๋™์‹œ์— ์˜ํ–ฅ์„ ๋ฏธ์น˜๊ฒŒ

Page 5: Effects of Geometric Parameters on Aerodynamic Performance ...

์–‘์ƒํ˜ธโ‹…๊น€๊ฒฝ์—ฝโ‹…ํ—ˆ๋งŒ์›…

36 ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, 2018

Fig. 10 Efficiency for the different number of stator blades

Fig. 11 Total pressure for the different number of stator blades

Fig. 12 Velocity contours on 50% span for the different Ns

๋˜์–ด ํšจ์œจ ๋ฐ ์ „์••๋ ฅ์˜ ๋ณ€ํ™”์— ํฌ๊ฒŒ ๊ธฐ์—ฌํ•˜์ง€ ์•Š์€ ๊ฒƒ์„ ์•Œ

์ˆ˜ ์žˆ์—ˆ๋‹ค.

4.4 ํ—ˆ๋ธŒ ๋น„์˜ ์˜ํ–ฅ์„ฑ ๋ถ„์„

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ—ˆ๋ธŒ ๋น„์˜ ์˜ํ–ฅ์„ฑ์„ ๋ถ„์„ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ํ—ˆ

๋ธŒ ๋น„(HR)๋ฅผ 62%์™€ 65%๋กœ ์ฆ๊ฐ€์‹œ์ผœ ์ด์— ๋”ฐ๋ฅธ ์„ฑ๋Šฅ์„ ๋น„

๊ตํ•˜์˜€๋‹ค. ๊ธฐ์ค€ ํ˜•์ƒ์˜ HR์€ 56%์ด๋‹ค. ๋™์ต์˜ HR์„ ๋ณ€ํ™”

์‹œํ‚ฌ ๊ฒฝ์šฐ ์ž…๊ตฌ ๋ฒจ๋งˆ์šฐ์Šค, ์ž…๊ตฌ ์•ˆ๋‚ด ๊นƒ ๋ฐ ์ •์ต์˜ ํ—ˆ๋ธŒ ์ง๊ฒฝ

๋„ ๋™์ต์˜ ํ—ˆ๋ธŒ ์ง๊ฒฝ ๋ณ€ํ™”์— ๋งž์ถฐ ๊ฐ™์ด ๋ณ€ํ™”์‹œ์ผฐ๋‹ค. HR์˜

๋ณ€ํ™”๊ฐ€ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ์„ฑ๋Šฅํ•จ์ˆ˜๋“ค์— ๋Œ€ํ•œ ์˜ํ–ฅ์„ฑ์„ Fig.

13์— ๋‚˜ํƒ€๋‚ด์—ˆ๋‹ค. ๋™์ผ ํšŒ์ „์ˆ˜์™€ ์„ค๊ณ„์œ ๋Ÿ‰์—์„œ ๋น„๊ตํ•œ ๊ฒƒ์œผ

๋กœ ์ „์••๋ ฅ๊ณผ ํšจ์œจ์€ HR์ด 56~65%์˜ ๋ฒ”์œ„์—์„œ HR์ด ์ฆ๊ฐ€

ํ•จ์— ๋”ฐ๋ผ ๊ฐ์†Œํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€๋‹ค.

Fig. 14๋Š” ๋™์ต๊ณผ ์ •์ต์˜ ์ž์˜ค๋ฉด(meridional plane) ์ƒ์—

์„œ HR์˜ ์ฆ๊ฐ€์— ๋”ฐ๋ฅธ ์ „์••๋ ฅ ๋ถ„ํฌ์˜ ๋ณ€ํ™”๋ฅผ ๋น„๊ตํ•˜์—ฌ ๋ณด์—ฌ

์ค€๋‹ค. ๋™์ต์˜ ์˜ํ–ฅ์œผ๋กœ ํ›„๋ฅ˜์—์„œ ์ „์••๋ ฅ์ด ์ž˜ ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒƒ์„

ํ™•์ธํ•  ์ˆ˜ ์žˆ์œผ๋ฉฐ, ๋Œ€์ฒด์ ์œผ๋กœ ๋™์ต ํ›„์—ฐ(trailing edge)์˜

hub์—์„œ shroud์™€ ๋น„๊ตํ•˜์—ฌ ํฐ ์ „์••๋ ฅ ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋Š” ๊ฒƒ์„

์•Œ ์ˆ˜ ์žˆ๋‹ค. ๋˜ํ•œ, HR๊ฐ€ ์ž‘์„์ˆ˜๋ก ์ „์••๋ ฅ์ด ์ž˜ ์ƒ์Šนํ•˜๋Š” ๊ฒƒ

์„ ์•Œ ์ˆ˜ ์žˆ์œผ๋ฉฐ, ์ด๋Ÿฌํ•œ ๊ฒฝํ–ฅ์€ Fig. 15์— ๋ณด์ด๋Š” ๊ฒƒ๊ณผ ๊ฐ™์ด

์ •์•• ๋ถ„ํฌ์—์„œ๋„ ํ™•์ธํ•  ์ˆ˜ ์žˆ๋‹ค.

HR์˜ ๊ฐ์†Œ์— ์˜ํ•œ ์ •์••์˜ ์ฆ๊ฐ€๊ฐ€ ์ „์••๋ ฅ์˜ ์ƒ์Šน์— ์˜ํ–ฅ์„

๋ฏธ์น˜๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜ ์žˆ์—ˆ๋‹ค. ์ •์•• ๋ถ„ํฌ์˜ ๊ฒฝ์šฐ, ๋™์ต ์ „์—ฐ

(leading edge)์˜ hub ๋ถ€๊ทผ์— ๋‚ฎ์€ ์ •์•• ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋ฉฐ, ์ด

๋‚ฎ์€ ์ •์•• ์˜์—ญ์€ HR๊ฐ€ ํด์ˆ˜๋ก ์ปค์ง€๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€๋‹ค.

๊ทธ๋ฆฌ๊ณ  ์ž์˜ค๋ฉด ์ƒ์˜ ์†๋„ ๋ถ„ํฌ ๋ณ€ํ™” ๋น„๊ต๋ฅผ Fig. 16์— ๋‚˜

ํƒ€๋‚ด์—ˆ๋‹ค. HR์ด ์ปค์งˆ์ˆ˜๋ก ์ž์˜ค๋ฉด ์ƒ์˜ ์†๋„ ๋ถ„ํฌ๋Š” ์ƒ๋Œ€์ 

์œผ๋กœ ๋†’์€ ์†๋„ ๋ถ„ํฌ๋ฅผ ๋ณด์ด๋ฉฐ, ์ด๋Š” HR์˜ ์ฆ๊ฐ€์— ๋”ฐ๋ฅธ ์œ 

๋กœ๊ฐ€ ์ข์•„์ ธ ์œ ์†์ด ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒƒ์ž„์„ ์•Œ ์ˆ˜ ์žˆ๋‹ค.

๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ—ˆ๋ธŒ ๋น„์˜ ๋ณ€ํ™”๊ฐ€ ์„ฑ๋Šฅ๊ณก์„  ๋ณ€ํ™”์— ๋ฏธ์น˜

๋Š” ์˜ํ–ฅ์„ ํ™•์ธํ•˜๊ธฐ ์œ„ํ•˜์—ฌ Fig. 17๊ณผ ๊ฐ™์ด ๋น„๊ตํ•˜์˜€๋‹ค.

์ „์ฒด์ ์œผ๋กœ HR์ด ์ฆ๊ฐ€ํ• ์ˆ˜๋ก ์œ ๋Ÿ‰์— ๋”ฐ๋ฅธ ํšจ์œจ ๊ฐ’์ด ๊ฐ์†Œ

ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€์œผ๋ฉฐ, ์ตœ๋Œ€์œ ๋Ÿ‰์ด ์ค„์–ด๋“œ๋Š” ๊ฒƒ์„ ํ™•์ธํ•  ์ˆ˜

์žˆ์—ˆ๋‹ค. ๋˜ํ•œ ์ตœ๋Œ€ํšจ์œจ์ ์ด HR์˜ ์ฆ๊ฐ€์— ๋”ฐ๋ผ ์ €์œ ๋Ÿ‰์ ์œผ

๋กœ ์ด๋™ํ•˜๋Š” ๊ฒƒ์„ ์•Œ ์ˆ˜ ์žˆ์—ˆ๋‹ค.

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๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ํ˜•์ƒ ๋ณ€์ˆ˜๊ฐ€ ๊ณต๋ ฅํ•™์  ์„ฑ๋Šฅ์— ๋ฏธ์น˜๋Š” ์˜ํ–ฅ

ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, 2018 37

Fig. 13 Performance parameters for the different HR

Fig. 14 Total pressure contours on meridional plane with the

variance of HR

Fig. 15 Pressure contours on meridional plane with the

variance of HR

5. ๊ฒฐ ๋ก 

๋ณธ ์—ฐ๊ตฌ์—์„œ๋Š” 30km ์ด์ƒ ์ดˆ์žฅ๋Œ€ ํ•ด์ €ํ„ฐ๋„์—์„œ ์žฅ๊ฑฐ๋ฆฌ

๋ฐฐ์—ฐ์„ ์œ„ํ•œ ํ™˜๊ธฐ ๋ฐ ์ œ์—ฐ์šฉ์œผ๋กœ ์‚ฌ์šฉ๋˜์–ด์ง€๋Š” 4.0 kPa ๊ธ‰

๊ณ ์ •์•• ๊ณ ํšจ์œจ ์ถ•๋ฅ˜ํŒฌ์„ ๊ฐœ๋ฐœํ•˜์˜€์œผ๋ฉฐ ์‹ค ์†กํ’๊ธฐ ๋Œ€๋น„

62.5% ์ถ•์†Œ ๋ชจ๋ธ ์‹œ์ œํ’ˆ์„ ์ œ์ž‘ํ•˜์—ฌ ๊ณต๋ ฅ์„ฑ๋Šฅ์‹œํ—˜์„ ์‹ค์‹œํ•˜

์˜€๋‹ค. ๋˜ํ•œ ์‚ผ์ฐจ์› RANS ํ•ด์„์„ ํ†ตํ•ด ๋™์ต๊ณผ ์ •์ต์˜ ๋‚ ๊ฐœ

์ˆ˜์™€ ํ—ˆ๋ธŒ ๋น„๋ฅผ ํ˜•์ƒ๋ณ€์ˆ˜๋กœ ๊ณ ๋ คํ•˜์—ฌ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์˜ ๊ณต๋ ฅ

์„ฑ๋Šฅ์— ๋Œ€ํ•œ ์˜ํ–ฅ์„ฑ์„ ํ‰๊ฐ€ํ•˜์˜€๋‹ค. ์ด๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ ๋‹ค์Œ๊ณผ ๊ฐ™

์€ ๊ฒฐ๊ณผ๋ฅผ ํ™•์ธํ•˜์˜€๋‹ค.

1) ์‹ค ์†กํ’๊ธฐ ๋Œ€๋น„ 62.5%์˜ ์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ์œผ๋กœ ์„ฑ๋Šฅ์‹œ

ํ—˜ ํ•œ ๊ฒฐ๊ณผ๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ AMCA 802 ๊ทœ์ •์— ์˜ํ•ด ์„ฑ๋Šฅ์„

ํ™˜์‚ฐํ•˜๋ฉด ์ง๊ฒฝ ฯ† 2350 x 1,185 r/min๊ณผ ฯ† 3,200 x 885

r/min ํฌ๊ธฐ์˜ ์ถ•๋ฅ˜ํŒฌ์—์„œ ๊ฐ๊ฐ 4kPa (408 mmAq)

์ด์ƒ์˜ ์••๋ ฅ๊ณผ 83.1% ์ด์ƒ ๊ณ ํšจ์œจ ์„ฑ๋Šฅ์„ ์–ป์„ ์ˆ˜ ์žˆ

์„ ๊ฒƒ์œผ๋กœ ํŒ๋‹จ๋œ๋‹ค.

2) ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์— ๋Œ€ํ•œ RANSํ•ด์„ ๊ฒฐ๊ณผ์˜ ์‹ ๋ขฐ์„ฑ์„ ๊ฒ€

์ฆํ•˜๊ธฐ ์œ„ํ•˜์—ฌ ์ถ•์†Œ ๋ชจ๋ธ ์ถ•๋ฅ˜ํŒฌ์˜ ์„ฑ๋Šฅ์‹œํ—˜ ๊ฒฐ๊ณผ ๊ฐ’

๊ณผ ์ˆ˜์น˜ํ•ด์„ ๊ฒฐ๊ณผ๋ฅผ ๋น„๊ตํ•˜์˜€์œผ๋ฉฐ, ํšจ์œจ ๋ฐ ์ „์••๋ ฅ์€

์„ค๊ณ„์ ์—์„œ ๊ฐ๊ฐ 0.5% ๋ฐ 5.8%์˜ ์˜ค์ฐจ๋ฅผ ๋ณด์˜€๋‹ค. ์„ฑ

๋Šฅ๊ณก์„  ๊ฒฐ๊ณผ๋Š” ์ „์ฒด์ ์œผ๋กœ ์ž˜ ์ผ์น˜ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์—ฌ

์ˆ˜์น˜ํ•ด์„ ๊ฒฐ๊ณผ์˜ ์‹ ๋ขฐ์„ฑ์„ ๊ฒ€์ฆํ•˜์˜€๋‹ค.

3) ๋™์ต์˜ ๋‚ ๊ฐœ ์ˆ˜๋ฅผ 7~16๋งค๋กœ ๋ณ€ํ™”์‹œ์ผœ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ

์˜ ํšจ์œจ ๋ฐ ์ „์••๋ ฅ์„ ๋น„๊ตํ•˜์˜€๋‹ค. ํšจ์œจ์˜ ๊ฒฝ์šฐ ๋‚ ๊ฐœ ์ˆ˜

๊ฐ€ 14๋งค ์ด์ƒ์—์„œ๋Š” ํฐ ๋ณ€ํ™”๊ฐ€ ์—†์—ˆ์œผ๋ฉฐ, ์ „์••๋ ฅ์€ ๋™

์ต์˜ ๋‚ ๊ฐœ ์ˆ˜๊ฐ€ ์ฆ๊ฐ€ํ•จ์— ๋”ฐ๋ผ ์ฆ๊ฐ€ํ•˜๋Š” ๊ฒฝํ–ฅ์„ ๋ณด์˜€๋‹ค.

4) ์ •์ต์˜ ๋‚ ๊ฐœ ์ˆ˜ ๋ณ€ํ™”์˜ ์˜ํ–ฅ์„ฑ์„ ํŒŒ์•…ํ•˜๊ธฐ ์œ„ํ•˜์—ฌ

11~23๋งค๋กœ ๋ณ€ํ™”์‹œ์ผœ ์ถ•๋ฅ˜ํŒฌ์˜ ํšจ์œจ ๋ฐ ์ „์••๋ ฅ์„ ๋น„๊ต

ํ•˜์˜€์œผ๋ฉฐ, ์ด๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ ์ •์ต์˜ ๋‚ ๊ฐœ ์ˆ˜ ๋ณ€ํ™”๋Š” ์ถ•๋ฅ˜

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์–‘์ƒํ˜ธโ‹…๊น€๊ฒฝ์—ฝโ‹…ํ—ˆ๋งŒ์›…

38 ํ•œ๊ตญ์œ ์ฒด๊ธฐ๊ณ„ํ•™ํšŒ ๋…ผ๋ฌธ์ง‘: ์ œ21๊ถŒ, ์ œ6ํ˜ธ, 2018

Fig. 16 Velocity contours on meridional plane with the

variance of HR

Fig. 17 Comparison of performance curves for different HR

์˜ ๊ณต๋ ฅ์„ฑ๋Šฅ์— ํฐ ์˜ํ–ฅ์„ ๋ฏธ์น˜์ง€ ์•Š๋Š” ๊ฒƒ์„ ํ™•์ธํ•˜์˜€๋‹ค.

5) ํ—ˆ๋ธŒ ๋น„๋ฅผ 56~65%๋กœ ๋ณ€ํ™”์‹œ์ผœ ์ถ•๋ฅ˜ํŒฌ์˜ ํšจ์œจ ๋ฐ ์ „

์••๋ ฅ์„ ๋น„๊ตํ•˜์˜€์œผ๋ฉฐ, ํ—ˆ๋ธŒ ๋น„๋ฅผ ์ฆ๊ฐ€์‹œํ‚ฌ์ˆ˜๋ก ํšจ์œจ

๋ฐ ์ „์••๋ ฅ์˜ ๊ฐ์†Œ๋ฅผ ํ™•์ธํ•˜์˜€๋‹ค.

์ด์ƒ์˜ ์—ฐ๊ตฌ๊ฒฐ๊ณผ๋ฅผ ๋ฐ”ํƒ•์œผ๋กœ ์ถ”ํ›„์— 30km ์ด์ƒ์˜ ์ดˆ์žฅ๋Œ€

ํ•ด์ €ํ„ฐ๋„์ด๋‚˜ ์œก์ƒํ„ฐ๋„, ์ฒ ๋„ํ„ฐ๋„, ์ง€ํ•˜์ฐจ๋„ ๋“ฑ์˜ ํ™˜๊ธฐ ๋ฐ ์ œ์—ฐ

์šฉ ์†กํ’๊ธฐ๋กœ์„œ 4.0kPa ์ด์ƒ์˜ ๊ณ ์ •์•• ์ถ•๋ฅ˜ํŒฌ์œผ๋กœ ์‚ฌ์šฉ์ด ๊ฐ€๋Šฅ

ํ•˜๋ฉฐ, ๊ณ ํšจ์œจ ์ตœ์ ์„ค๊ณ„ ๋ฐ ์‹œ๋ฆฌ์ฆˆํ™” ์„ค๊ณ„๋กœ ๊ด‘์‚ฐ์ด๋‚˜ ์‚ฐ์—…์šฉ

์ถ•๋ฅ˜ํŒฌ์œผ๋กœ ์ ์ฐจ ์‚ฌ์šฉ ์šฉ๋„๋ฅผ ๋„“ํž ์ˆ˜ ์žˆ์„ ๊ฒƒ์œผ๋กœ ์‚ฌ๋ฃŒ๋œ๋‹ค.

ํ›„ ๊ธฐ

๋ณธ ์—ฐ๊ตฌ๋Š” ๊ตญํ† ๊ตํ†ต๋ถ€ ๊ตญํ† ๊ตํ†ต๊ณผํ•™๊ธฐ์ˆ ์ง„ํฅ์›์˜ ๊ฑด์„ค๊ธฐ

์ˆ ์—ฐ๊ตฌ์‚ฌ์—…(๊ณ ์ˆ˜์•• ์ดˆ์žฅ๋Œ€ ํ•ด์ €ํ„ฐ๋„ ๊ธฐ์ˆ ์ž๋ฆฝ์„ ์œ„ํ•œ ํ•ต์‹ฌ์š”

์†Œ ๊ธฐ์ˆ ๊ฐœ๋ฐœ, 13๊ฑด์„ค์—ฐ๊ตฌT01)์˜ ์ง€์›์œผ๋กœ ์ˆ˜ํ–‰๋˜์—ˆ์Šต๋‹ˆ๋‹ค.

References

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