| With the development of the society, the consumption of energy also increases rapidly.Wind power as a kind of renewable clean energy got more and more attention. Windturbine as the main equipment of wind power generation, it is important to accuratelypredict its aerodynamic performance and structure which has very important engineeringsignificance. With the development of modern computer technology and improvement ofturbulent flow simulation technology, CFD method was widely used. This thesis took thewind utilization direction and small high-speed centrifugal fan application project as thebacking ground, and adopted the method of numerical simulation to research the horizontalaxis wind turbine and centrifugal fan.Firstly, it is studied the airfoil S809which was used on NREL Phase â…¥. The Cstructure grid was chosen because it can guarantee the near wall grid y+<1. The flow nearthe airfoil wall was simulated directly. Through the contrast with the experimental data, theresults showed that the SST turbulence model was more suitable than S-A for flowsimulation with stall condition. The results showed that both blunt trailing edge methodscould improve the aerodynamic performance of airfoil at high Angle of attack range.Adopting DES SST turbulence model, NREL Phase VI was researched underdifferent wind speed and got the wind pressure distribution and streamline distribution ofblade surface. According to the simulation results,3d rotating effect was analyzed.Considering the problem to the safe operation of wind turbines, through flow structurecoupling method, the stress and deformation of the whole rotor was studied. The staticsanalysis results showed that the wind turbines can operate safely for a long time. |
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