D.G. PHILLIPS, P.J. RICHARDS and R.G.J.FLAY

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Presentation transcript:

D.G. PHILLIPS, P.J. RICHARDS and R.G.J.FLAY DIFFUSER DEVELOPMENT FOR A DIFFUSER AUGMENTED WIND TURBINE USING COMPUTATIONAL FLUID DYNAMICS D.G. PHILLIPS, P.J. RICHARDS and R.G.J.FLAY

The University of Auckland, New Zealand

The Vortec 7 Diffuser Augmented Wind Turbine Originally designed by Grumman Aerospace in the early 80’s, but built in New Zealand in 1997.

New Zealand is a long way from anywhere! There is very little of anything to slow the wind.

Diffuser Augmented Wind Turbines (DAWT) Conventional Bare Wind Turbine

Geometry of the Vortec 7 Diffuser Outlet Flange Secondary Slot Turbine Blade Inlet Truss Structural Inlet Ring Diffuser Outlet Flange Inlet Slot Original Vortec 7 Instep C

Geometry of the Vortec 7 Diffuser Outlet Flange Secondary Slot Turbine Blade Inlet Truss Structural Inlet Ring Diffuser Outlet Flange Inlet Slot Original Vortec 7 Instep C

Geometry of the Vortec 7 Diffuser Outlet Flange Secondary Slot Turbine Blade Inlet Truss Bullnose Structural Inlet Ring Diffuser Outlet Flange Inlet Slot Original Vortec 7 Modifications Instep Nosecone C

Modelling the as-built Vortec 7

Modelling the modified Vortec 7

Vector Map for the modified Vortec 7

Wind Tunnel Modelling

CFD modelling of the new diffuser

Original comparison

Comparison including blockage effects.

Latest Design

CONCLUSIONS Computational modelling has proved to be a valuable tool in the development of diffuser designs for a diffuser augmented wind turbine. The combination of computational modelling, wind tunnel modelling and full-scale testing has made it possible to identify deficiencies in the other techniques.

3rd International Symposium on Computational Wind Engineering University of Birmingham, England 4-7 September 2000 COMPETITION To model the flow around a 6m Cube in a rural atmospheric boundary layer www.pfconsultants.co.uk/cwe2000