Journal of Fundamentals of Renewable Energy and Applications
Open Access
ISSN: 2090-4541
+44 1300 500008
ISSN: 2090-4541
+44 1300 500008
V V Dighe, J Tang and G J W van Bussel
Delft University of Technology, Netherlands
Posters & Accepted Abstracts: J Fundam Renewable Energy Appl
This study presents a numerical investigation of diffuser augmented wind turbines (DAWT) using wind tunnel validated Computational Fluid Dynamics (CFD). A set of experiments on the ΓΆΒ?Β?donQi Urban Windmill 1.5ΓΆΒ?Β? DAWT model have been conducted in the low-speed closed-loop open-jet (OJF) wind tunnel located at the Aerodynamics Department within the Delft University of Technology. The pressure drop at the turbine location was imposed with the aid of porous mesh screen, having a porosity, p = 40% and averaged thrust co-efficient, CT = 0.84. The flow is modelled through solution of Reynolds-averaged Navier Stokes (RANS) equations; turbine is represented by an actuator disc. Flow measurements were carried using pitotstatic probe in the axial and radial direction inside the duct, and dynamic pressure was recorded for different flow velocities. Using the dynamic pressure head at the screen, the pressure jump co-efficient, C2 was derived and used as an input boundary condition for the CFD model. Leading edge separation as encountered by the smoke visualization method, and was rightly captured by the CFD method. Also, the velocity measurements for the CFD data inside the duct were in good agreement with the wind tunnel measurements. More precisely, an alternative computationally less expensive method is formulated to understand and visualize the flow around the DAWT.
Email: V.V.Dighe@tudelft.nl