翼型低速动态气动特性的实验技术研究

The Experiment Technology Investigation of Low-speed Airfoil Dynamic Aerodynamic Characters

飞行器超过失速迎角后,其动态失速气动特性与静态气动特性迥然不同。为了分析飞行器失速后的非定常气动特性,文中设计了一种翼型低速动态测压实验方法,通过改变翼型的振幅和振动频率,研究了翼型俯仰、沉浮振动的非定常气动特性,分析了各种因素对动态失速特性的影响。俯仰运动时,翼型升力随振动频率的增加而增大,失速延迟。在沉浮运动中,当频率较小时,翼型的升力和失速迎角受振幅的影响较为明显。

The aircraft＇s dynamic stall aerodynamic characteristics are different from static aerodynamic characteristics after stall. In order to analyze the unsteady characteristics of airfoil, an experimental method of low-speed airfoil dynamic was presented briefly in this paper. By changing the attack angle and vibration frequency, the unsteady aerodynamic characteristics of airfoil during pitch-up movement and plunge movement were researched, and the influence of various factors was analyzed. With increase of vibration frequency, the lift will increase and stall angle will be delayed during pitch-up movement. When the frequency is small, the impact of amplitude to lift and attack angle of stall are obvious during plunge movement