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

FMGroup @ DMA-Sapienza

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

FMGroup @ DMA-Sapienza

FMGroup @ DMA-Sapienza

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

FMGroup @ DMA-Sapienza

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

DIMA-FP TW1.5 turbine

POSEIDONE Project

FMGroup @ DMA-Sapienza

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

DIMA-FP TW1.5 turbine

POSEIDONE Project

FMGroup @ DMA-Sapienza

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

DIMA-FP TW1.5 turbine

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)

FMGroup @ DMA-Sapienza

DIMA-FP TW1.5 turbine

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

FMGroup @ DMA-Sapienza

FMGroup @ DMA-Sapienza

DIMA-FP TW1.5 turbine

Proto-type manufacturing

Poseidone test rig @ Faggiolati Pumps

Aerodynamic measurements

Forced draft fan

inverter & chopper

FMGroup @ DMA-Sapienza

Aerodynamic characterization

Experiments vs design

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

FMGroup @ DMA-Sapienza

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

POSEIDONE Project

FMGroup @ DMA-Sapienza

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

FMGroup @ DMA-Sapienza

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

FMGroup @ DMA-Sapienza

Acoustic characterization

BPM

experiments

Q3

POSEIDONE Project

FMGroup @ DMA-Sapienza

Acoustic characterization

Experiments vs BPM model

POSEIDONE Project

FMGroup @ DMA-Sapienza

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