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

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Presentation on theme: "DIFFUSER DEVELOPMENT FOR A DIFFUSER AUGMENTED WIND TURBINE USING COMPUTATIONAL FLUID DYNAMICS D.G. PHILLIPS, P.J. RICHARDS and R.G.J.FLAY."— Presentation transcript:

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

2 The University of Auckland, New Zealand

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

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

5 Diffuser Augmented Wind Turbines (DAWT) Conventional Bare Wind Turbine

6

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

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

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

11 Modelling the as-built Vortec 7

12 Modelling the modified Vortec 7

13 Vector Map for the modified Vortec 7

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15 Wind Tunnel Modelling

16 CFD modelling of the new diffuser

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18 Original comparison

19 Comparison including blockage effects.

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22 Latest Design

23 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.

24 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


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