基于涡流发生器的翼型风洞试验侧壁干扰控制研究

Research on Sidewall Interference Control in Airfoil Wind Tunnel Test Based on Vortex Generator

大厚度翼型风洞试验的侧壁干扰严重,需对侧壁边界层进行控制。本文首次使用被动式涡流发生器(VG)对大厚度翼型FX77-W-400的侧壁干扰效应进行控制,提出两种基于VG的侧壁干扰控制构型:侧壁VG和翼面VG,研究VG安装位置对翼型气动性能以及压力场细节的影响;使用本征正交分解(POD)技术对翼型表面压力场结构进行研究。结果表明:本文使用的被动式VG可对侧壁干扰进行有效控制;侧壁VG和翼面VG对翼型表面的吸力峰值有影响,在本文研究范围内,升力系数和吸力峰值之间存在显著的线性相关性;本文使用的侧壁干扰控制形式保持了基准翼型表面流动的主要结构。

The wind tunnel sidewall boundary layer needs to be controlled since the sidewall interference in the wind tunnel test of the large-thickness airfoil is serious.In this paper,passive vortex generators(VG)are used at first time to control the sidewall interference effect on the large-thickness airfoil FX77-W-400,and two VG-based sidewalls interference control configurations are proposed,i.e.sidewall VG and airfoil VG.The effects of the VG installation position on the airfoil aerodynamic performance and pressure field details are studied,and the proper orthogonal decomposition(POD)is used to study the airfoil surface pressure field structure.The research shows that:the passive VG used in this work can effectively control the sidewall interference.The peak suction of the airfoil surface is affected by sidewall VG and airfoil VG.There is a significant linear correlation between the lift coefficient and the peak suction within the scope of this study.The sidewall interference control method used in this work maintains the main structure of the reference airfoil surface flow.The research is of certain guiding significance for the wind tunnel test and theoretical research.