翼身连接处几何参数优化匹配的流动机理仿真

Flow Mechanism Simulation of Optimization and Matching of Geometric Parameters at Wing Body Junction

飞机由各个部件组装成为一个整体,在各个连接部位彼此气流互相干扰,会导致干扰阻力增加,严重影响飞机大迎角下的气动性能,因此,优化连接部位几何参数匹配对减小干扰阻力及改善飞机大迎角流动具有重要的工程应用价值。以某一特定飞机的机翼-机身的连接部位着陆构型为研究对象,采用数值模拟的方法,从连接部位的前缘、展向中段及后段3个方面开展几何参数优化匹配。结果表明:合适的前缘相对厚度、前缘后掠角和前缘整流长度、展向中段整流长度及后段翼根型面曲率能够有效地改善连接部位的气流分离,减小了干扰阻力,改善了升力特性和升阻力特性。

The aircraft is assembled by various components as a whole,and the air flow interferes with each other in each connection,which will increase the interference resistance and seriously affect the aerodynamic performance of the aircraft at high angle of attack.Therefore,it has important engineering application value to optimize the matching of geometric parameters at the joint to reduce the interference resistance and improve the flow of aircraft at high angle of attack.The wing fuselage joint of a certain aircraft and the landing configuration are taken as the research object,Numerical simulation method is used to optimize the geometric parameters matching from the leading edge,spanwise middle and back section of the joint.The results show that the appropriate leading edge relative thickness,leading edge sweep angle,leading edge rectification length,spanwise rectification length and trailing airfoil root profile curvature can effectively improve the flow separation at the junction,reduce the interference resistance,and improve the lift and lift drag characteristics.