Kathmandu University

International Symposium on Current Research in Hydraulic Turbines

(CRHT-V)

Development of Hill Chart Diagram for Francis Turbine model of Jhimruk

Hydropower using Computational Method

Supervised by:

DR. HARI PRASAD NEOPANE

MR. KRISHNA PRASAD SHRESTHA

MR. RAVI KOIRALA

Authors:

MAHESH KANDEL

PRASHANT NEOPANE

SUMAN SAPKOTA

23 March 2015

CRHT V, 2015 Kathmandu University

Background: Operational Scenario

overall efficiency of turbine increases with increasing discharge,

reaches maximum at design discharge and then starts decreasing

in part and full load the efficiency drop significantly

Maximum use of energy by minimum energy consumption

Developing technologies advanced simulation technologies

Performance testing prior to turbine manufacturing

CRHT V, 2015 Kathmandu University

Objectives

Performance analysis of Francis turbine

model of Jhimruk Hydropower by plotting

Hill Chart using Computational Method

CRHT V, 2015 Kathmandu University

Methodology: Research and Development

S/No. Research and

Developmental Stage Objectives Methods

1. Development of theoretical

foundations.

To have vision to

understand the theory

behind CFD.

1.1 Literature review

1.2 Discussion and Solving

CFD problem

2. Computer Aided

Simulations

To predict the

performance of the

turbine.

2.1 Theory and Literature

activity for understanding

ANSYS

2.2 CFD Computer simulation

using ANSYS 15 Package

CRHT V, 2015 Kathmandu University

Methodology: Tools used

S/No. Research Tools Objectives Methods

1. CAD (Solidworks)

Designing the Francis

turbine’s domain (Stay

vanes, Guide vanes, Runner

Blades, Draft tube).

1.1 Importing the coordinates

1.2 Designing the

components for the same.

2. CFD and CFX solver Performance analysis

through simulation

2.1 By using tools and

techniques in ANSYS 15.

3. MS Excel Determination of

Performance curves.

3.1 By plotting Graph

between the parameters.

4. MATLAB Development of Hill Chart.

4.1 Using the Graph

developed from Excel to

determine Hill Chart.

CRHT V, 2015 Kathmandu University

Model Description: Francis Turbine

CRHT V, 2015 Kathmandu University

CAD modeling

Runner

Stay Vanes Guide Vanes

Draft Tube

CRHT V, 2015 Kathmandu University

Meshing: Runner (ANSYS MESH)

CRHT V, 2015 Kathmandu University

Meshing, Boundary Conditions &

Solver Details

Mesh Size 8 mm

Advanced Size function Off

Relevence Center Fine

Method Hex Dominant

Inlet Mass Flow rate

Outlet 1 atm Pressure

Stay Vanes & Guide Vanes Frame Change = None

Guide Vanes & Runner Frame Change = Frozen rotor

Runner & Draft Tube Frame Change = Frozen rotor

Minimum iterations 1

Maximum iterations 2000

Tolerance e-4

Parallel Processors 4

Meshing

Boundary Conditions

Interfaces (Pitch Ratio = 1)

Convergence

Solution

CRHT V, 2015 Kathmandu University

Grid Independent Test

(Total nodes Selected 1082147) 279.9469 279.9064 279.8466

278.8048 278.6968

278.6

278.8

279

279.2

279.4

279.6

279.8

280

0 500000 1000000 1500000 2000000 2500000 3000000 3500000 4000000

Hea

d

Grid Number

CRHT V, 2015 Kathmandu University

Results: Discharge factor VS Speed factor

0

0.02

0.04

0.06

0.08

0.1

0.12

0.14

0.16

0.18

0 5 10 15 20

Qed

Ned

CRHT V, 2015 Kathmandu University

Results: Efficiency VS Speed factor

0

10

20

30

40

50

60

70

80

90

100

0 5 10 15 20

Eff

icie

ncy

(in

%)

Ned

CRHT V, 2015 Kathmandu University

REFERENCES

Patel K., Desai J., Chauhan V. and Charnia S. (2011) “Development of Francis Turbine using

Computational Fluid Dynamics”, The 11th Asian International Conference on Fluid Machinery

and the 3rd Fluid Power Technology Exhibition, November 21- 23, 2011, IIT Madras, Chennai,

India.

Jain S., Saini R. P. and Kumar A. (2010), CFD Approach for prediction Of Efficiency Of Francis

Turbine, IGHEM-2010, Oct 21- 23,2010, AHEC, IIT Roorkee, India.

Čarija Z., Mrša Z. and Fućak S. (2008), Validation of Francis water turbine CFD simulations,

Croatia.

Vu C. Thi., Koller M., Gauthier M., Deschênes C. (2010), Flow simulation and efficiency hill chart

prediction for a Propeller turbine at various design and off-design conditions, Switzerland.

Laín S., García M., Quintero B., Orrego S. (2008), CFD Numerical simulations of Francis

turbines, Columbia.

Neopane H. (2013), Lecture Slides on Hydraulic Turbines, Kathmandu University, Nepal.

Pudasaini S., Pathak A., Chaudhary B. (2013), Proposal on CFD Analysis of Pelton Turbine,

Kathmandu University, Nepal.

Paulsen J., FSI-analysis of a Francis turbine, NTNU, Norway.

Adhikari S., Report on Job Training at Waterpower Laboratory, NTNU, Nepal.

Barstad L. (2012), CFD analysis of a Pelton turbine, NTNU, Norway.

High Pressure Hydraulic Machinery (2009), Water Power Laboratory, NTNU, Norway

<Online retrieved> http://en.wikipedia.org/wiki/Francis_turbine, 2 October 2014

Kathmandu University

Thank you for your attention!