合成射流对钝尾缘翼型气动特性的影响

研究吸力面存在合成射流的情况下,钝尾缘翼型TR-4000-2000流场结构的变化及其升阻力系数等气动特性参数的变化趋势。在相同射流入口速度条件下,采用计算流体力学软件Fluent对相同来流速度不同攻角情况下翼型流场进行非定常数值模拟计算,分析射流前后翼型升阻力系数变化及翼型表面压力的波动状况;在此基础上,对不同射流频率和不同射流速度情况下翼型流场进行模拟计算,寻求最佳射流参数。结果表明,由于射流及尾缘涡的相互作用导致翼型的升阻力特性不断变化,钝尾缘翼型吸力面合成射流有明显的增升减阻效果,在15°攻角时尤为明显,升力系数提高约40%,阻力系数减小约25%。在量纲一射流速度和量纲一射流频率均为1时,射流对翼型的增升减阻效果最佳。

Influence of Synthetic Jet on Aerodynamic Characteristics of Blunt Trailing Edge Wind Turbine Airfoil

A study on blunt trailing edge wind turbine airfoil TR-4000-2000 is lunched to investigate the changing trend of flow filed structure and aerodynamic characteristics when the synthetic jet existing on suction surface. Keeping the constant velocity of jet, unsteady numerical simulation of airfoil flow field in different attack corner is performed by the mean of Computational Fluid Dynamics software FLUENT, and the influence caused by jet on aerodynamic characteristics and the pressure fluctuation on airfoil surface are analyzed, based on this, the best jet parameters are determined threw numerical simulation in different jet velocity and frequency. The analytic results show that the lift and drag characteristic of the airfoil constant changes because of interaction between the synthetic Jet and the trailing edge vortex, the synthetic jet on suction surface has significant effect on lift promotion and drag reduction, and the result is particularly obvious at attack angle of 15, where lift coefficient increases 40%, and drag coefficient decreases 15%. Besides, the best jet effect occurs when the dimensionless jet velocity and the dimensionless frequency are both 1.