Progetto e prima verifica operativa di una µ-turbina Wells ... · PDF fileNew class of...

M. Bassetti, A. Corsini, G. Delibra, F. Rispoli

Progetto e prima verifica operativadi una µ-turbina Wells per il Mar Mediterraneo

FMGroup @ DMA-SapienzaCRAS Sapienza

M. Ruggeri

This research has been carried out in the framework of the POSEIDONE consortium, under the auspices of MATTM

Workshop ENEA – Energia dal mare: Le nuove tecnologie per I mari italiani, Roma 1 luglio 2014

FMGroup @ DMA-Sapienza

Outline

Motivations and aims

Description of the POSEIDONE project

CFD based DIMA FP-TW turbine aerodynamic design

DIMA FP-TW turbine manufacturing

DIMA FP-TW test-rig & experimental validation campaignsDIMA FP-TW acoustic characterization

POSEIDONE Project

Motivations, why Ocean Energy in Mediterranean sea


Corsini A., et al Space-Time Mapping Of Wave Energy

Conversion Potential In Mediterranean Sea States. ASME-ATI-

UIT 2010

POSEIDONE Project

State-of-the-art class of wave energy converters

State-of-the-art Wells turbine, mono-plane

• self-rectifying turbine

• narrow operating margin

• designed for ocean conditions

above 30 kW/m

POSEIDONE Project

State-of-the-art OWC chamber

• standard OWC chamber features small period of oscillationdifficult resonance in case of near-shore waves

• reduced structural resistenceowing to the geometrical configuration

• opening in OWC attenuates energyconversion from small period waves



New class of wave energy converters (i)

POSEIDONE Project

POSEIDONE project

This programme of research aims at the definition of a technology standard

for on-shore WEC suited for Mediterranean sea states and port breakwater

caisson integrationin a view to develop the first Italian full-scale prototype and a open-ocean test-rig @ NOEL Lab in Reggio Calabria

The proposed WEC defines a RES for µ-power generation (1 - 100 kWe)

The WEC is based on the combination

an innovative resonant caisson (U-OWC or REWEC3) designed by

P. Boccotti and industrialized by WavEnergy.it s.r.l. (pat. n.

1332519)

Wells turbine concept tailored to cope with low-energy wave conditions

Boccotti P., 2007. Part I: Theory. Ocean Engineering. vol. 34, pp. 806-819.

Boccotti P., Filianoti P, Fiamma V, Arena F. 2007. Part II: A small-scale field experiment. Ocean Engineering. vol. 34, pp. 820-841.

New class of wave energy converters (ii), turbine

Design challenges for Mediterraneanapplications

• optimization of torque @ low flow rate

• stall resistent turbine

• compact unit at high rotational speed

• extension of duty time

POSEIDONE Project

experiments

Setoguchi T. Santhakumar S. Takao M. Kim T.H. Kaneko K. 2003 “A modified

Wells turbine for wave energy conversion” Renewable Energy


Efficiency

New class of wave energy converters (iii), turbine

POSEIDONE Project

Torque coefficient

3600 rpm

3000 rpm

Design challenges for Mediterraneanapplications

• optimization of torque @ low flow rate

• stall resistent turbine

• compact unit at high rotational speed

• extension of duty time

NACA0015

NACA0020

Design data requirements

Blade profile: NACA 0015Configuration: Monoplane

Outer diameter: 0.5 m

Rotational frequency: 3000 to 36000 rpm

Bulk velocity (design): 9.1 m/s

FMGroup @ DIMA-Sapienza

Target peak turbine power 2 kW

DIMA-FP TW1.5 turbine

Aerodynamic design process

Solidity checkCaisson hydrodynamic interface

Torque & power

Self-starting

Hub design

CFD-aided IGV-OGV design


POSEIDONE Project


Sensitivity to solidity

Blade solidity (σ) 0.64/0.5

Blade count (z) 3/4/7/8/9

Hub to tip ratio (÷) 0.75-0.5


POSEIDONE Project


Self-starting

shub c z L (m) T (N m) Paer(W) Pmecc (W) ηηηη

0.64 0.75 7 0.117

BEM simulation

5.20

BEM simulation

2215.00

BEM simulation

1960.00

BEM simulation

0.8

DIMA-FP TW1.5 turbine, CFD based design

POSEIDONE Project

Inflow velocity radial profileFMGroup @ DMA-Sapienza


CFD based design of IGV-OGV

POSEIDONE Project

FMGroup @ DMA-Sapienza A. Corsini, OWEMES2012, Rome, Italy, Sept 2012

TKE

(Peak flow expiration phase)

Velocity isolines

(Peak flow expiration phase)



CFD based design of IGV-OGV performance

POSEIDONE Project

DIMAFP-TW1.5

CFD rotor only

DIMAFP-TW1.5design

DIMAFP-TW1.5field data

(NOEL Lab)

Q[m3/s]

1.0178 0.948

∆∆∆∆p [Pa] 2679 2578 2707

Cm[Nm]

4.48 5.07

P [W] 1408 1592 1401




Proto-type manufacturing

Poseidone test rig @ Faggiolati Pumps

Aerodynamic measurements

Forced draft fan

inverter & chopper


Aerodynamic characterization

Experiments vs design

IGV Aerodynamic characterization

Experiments vs design

Acoustic mesaurments at the turbine exhaust in uni-directional operating mode

DIMA-FP 1.5 TW in rotor only configuration

Rotational frequency: n = 2000 rpm - 3000 rpm

Operating points: Q1 = 1000 m3/h, Q2 = 2000 m3/h, Q3 = 3000 m3/h, Q4 = 4000 m3/h (stall)

4 mic locations @ 5.32 m: A, B, C, D

Acoustic characterizationPOSEIDONE Project


3000 rpm (25°) - SPL frequencyspectra low-pass filtered @ 300 Hz

POSEIDONE Project


3000 rpm, Portata Q3 - SPL frequency spectra low-pass filtered@ 300 Hz

Rotational frequency:n = 3000 rpm

Flow rate:Q1 = 1000 m3/h, Q2 = 2000 m3/h, Q3 = 3000 m3/h, Q4 = 4000 m3/h (stall)

POSEIDONE Project


Acoustic characterization

Directivity of noise emission

XFOILturbine design

BET AnalysisModule

Boundary Layer Module

Integral Quantities Analysis

BPM Aeroacustic Model

BPM noise prediction

• TBL-SE, trailing-edge noiseturbulent BL

• LBL-VS, vortex noise

• S-S, stall and separation noise



BPM

experiments

Q3

POSEIDONE Project



Experiments vs BPM model

POSEIDONE Project


DIMA FP TW futures

DIMA-FP TW 25

Brevetto dep. controllo attivo del flusso e dell’inerzia, marzo 2014

Development of a wave energy converterfor Mediterraneanoperation

FMGroup @ DMA-SapienzaCRAS Sapienza

This research has been carried out in the framework of the POSEIDONE consortium, under the auspices of MATTM

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