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以风力机专用翼型的动态失速为对象,采用一种基于流场当地变量的Gamma-Theta转捩模型配合SSTk-ω湍流模型进行数值模拟,研究转捩对动态失速性能的影响和动态失速下的转捩规律。结果表明,使用考虑转捩效应,能够使动态失速过程中上仰段大迎角状态下失速和下俯段气流再附的模拟得到改善。在动态失速上仰段,上表面转捩由后缘分离泡向前缘分离泡的转变过程较快,导致转捩点迅速前移;而在下俯段,前缘分离泡向后缘分离泡的转变过程中经过了自然转捩和再层流化的过渡,因此转捩点的移动较上仰段平滑。
Taking the dynamic stall of airfoil dedicated to wind turbine as an example, a Gamma-Theta transition model based on the local variables of flow field was used in conjunction with the SSTk-ω turbulence model to study the effect of stalling on dynamic stalling performance and dynamic stall Turn rule. The results show that the simulation of stalling at the high angle of attack and reattachment of the subducting zone during the dynamic stall can be improved by considering the transition effect. In the dynamic stall on the Yang paragraph, the upper surface of the transition from the trailing edge of the separation bubble to the front edge of the rapid separation of the bubble transition, leading to transition point quickly forward; and in the next section, the front edge of the separation bubble separation bubble separation process After the natural transition and re-fluidization of the transition, so turning point of the move than the upsurge section smooth.