头部波系对气动舵颤振特性的影响研究

Effects of Head Wave Structure on Flutter Characteristics of Control Surface

以分析头部波系对气动舵颤振的影响为目的,采用CFD/CSD耦合算法。在耦合中采用保形动网格策略保持弹身和舵面的几何外形。对单独舵面和舵身组合体计算发现:与单独舵面相比,舵身组合体颤振边界随马赫数升高下降更快;在Ma=7时,单独舵面尚未颤振而组合体中的舵面已颤振。其机理为头部波系对气动舵的影响:马赫数升高,头部圆锥激波内移,膨胀低压区缩小,舵面上激波和外流场的总影响区扩大,气动舵更易颤振。

This paper aims at analyzing the effects of shock and expansion wave structure of head on flut- ter characteristics of aerodynamic rudder. Computational fluid dynamics/computational structural dynamics（CFD/CSD） coupling algorithm has been used to achieve that purpose. The shape preserving method is adopted in coupling analysis to avoid destruction of body and rudder＇s shape. The results of sole rudder and rudder- body combination show that the flutter boundary of rudder- body combination decreases faster compared to sole rudder as the Mach number increases and that rudder- body combination flutters at Ma = 7 while sole rudder is still stable. The mechanism is the effects of shock and expansion wave structure of head on the rudder which means the rudder is more liable to flutter as Mach number increases which causes conical head shock moves inward leading to that expansion area shrinks and the influence area of shock and external flow expands.