翼型大攻角的振动对气动性能影响的初步分析

通过求解非定常Navier-Stokes方程,模拟了风洞实验中模型振动条件下的流场,以翼型振动对流场和气动力的影响为突破口,研究了模型振动对流场、尤其是大迎角流场的影响,并考虑了模型弹性轴不同位置对结果的影响。研究结果表明:在临近传统定常失速迎角的大迎角条件下,翼型的振动可以引起翼型大尺度的分离,导致翼型失速的提前发生,其提前量取决于振动的幅度、频率。风洞模型设计中的弹性轴所处的翼型弦向位置也对结果有一定影响。其研究结果对大展弦比机翼的风洞实验结果分析、模型设计有指导意义。

Primary Analysis of Vibration Aerodynamic on a Airfoil at High Attack

Based on the unsteady Reynolds-Averaged Navier-Stokes equations,the flow field and aerodynamic characteristics of an airfoil at high attack are investigated which is consideration of vibrations for wind-tunnel models,especially for the wind-tunnel airplane with high aspect ratio wing.The considered two vibration models for the airfoil are plunging and pitching motions,and the phase delay between the different vibrations is also studied.It is shown that the vibrations of the airfoil can cause large scale uns...