Numerical Simulation of The Aerodynamic Performance of Horizontal-Axis Wind Turbine (HAWT) Blades

  • 李 孟賢

Student thesis: Master's Thesis

Abstract

The purpose of this study is to investigate the differences of the aerodynamic performance on the horizontal-axis wind turbine blades of two different type of geometry shape One of the blade is designed by blade element momentum theory (BEMT) and the other blade is a non-twisted with a constant chord length which is called Baseline blade In order to investigate on the BEMT designed blade in which has a great performance of power coefficient than Baseline blade Therefore the effect of the aerodynamic performance on the blades would be investigated in this study It would use the wind tunnel experiment to measure the power coefficients of these two blades for the numerical simulation to verify the experimental data In the numerical simulation the appropriate y^+ value is found by 2D simulation and the value would apply in 3D simulation in order to find the appropriate turbulence model In addition the aerodynamic performances of the blades are obtained by using the SST k-ω turbulence models of 2^nd upwind scheme with SIMPLE algorithm method to solve the Reynolds-averaged Navier Stokes (RANS) equations It would observe the flow fields phenomenon on blade surface for explaining the differences of the aerodynamic performance by using the numerical simulation From observing the flow fields on the blades it can be seen that the BEMT designed blade would reduce the separated flow occurrence at the root due to the twist angle of the blade At the wind speed of 10 m/s with the tip speed ratio of 5 236 which is very close to the design tip speed ratio of 5 the BEMT designed blade has a greater power coefficient than Baseline blade because the flow field on the suction side of the blade is not occurred the separation
Date of Award2014 Aug 20
Original languageEnglish
SupervisorYui-Chuin Shiah (Supervisor)

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