University of Twente Student Theses


Double wake model for separated flows over airfoils

Vaithiyanathasamy, Mr. Rajesh (2017) Double wake model for separated flows over airfoils.

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Abstract:Industry standard aerodynamic design tool RFOIL's performance can be improved at high angles of attack by incorporating the double wake inviscid model in the separated flow region. As a precursor, single wake inviscid model is developed using 2-D panel method to replicate the outcome of the standard tools. Then the double wake inviscid model is established on top with changes in the Kutta condition and local vorticity at the separation point. The solution is calculated by iterative procedure by establishing two wake sheets one from the trailing edge and the other from the separation point. The wake shapes are established from induced velocities of the airfoil vorticity distribution. The double wake inviscid model could establish better results than XFOIL and results closer to the experiment in the separated flow region over airfoils. This model can be combined with the viscous effects to mitigate the convergence problem at very high angles of attack with separated flows. Furthermore, improvement in the prediction of the lift coefficient is expected when this model is coupled with viscous effects calculations of RFOIL. As a second major study a dynamic stall model for pitching airfoils using modified Beddoes-Leishman method for wind turbine application is implemented. The implementation combines the best of two previous implementations. The model successfully predicts the dynamic stall phenomena with small discrepancies when compared with experimental data.
Item Type:Essay (Master)
Energy Research Centre of the Netherlands, Petten, Netherlands
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Sustainable Energy Technology MSc (60443)
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