机头顶点对战斗机大迎角航向气动特性影响研究

Study on the effect of different nose tip on the yaw characteristics of aircraft at high angles of attack

就机头微扰动、表面粗糙度、机头顶点形状等因素对战斗机大迎角航向气动特性的影响进行了试验研究。结果表明:大迎角下飞机的航向气动特性对机头表面粗糙度和顶点形状较敏感,不同表面粗糙度和不同机头顶点形状使飞机大迎角下的侧向力和偏航力矩有较大差异,圆头机头对消除和控制飞机在大迎角下的侧向力和偏航力矩效果明显;机头颗粒和顶点细微不对称对大迎角下飞机的航向气动特性微扰动作用明显,使大迎角偏航力矩方向和极值基本确定。

The test study on the effect of different nose tip on the yaw characteristics of aircraft at high angles of attack is introduced.It is shown that different nose surface roughness and nose tip have great influence on the yaw characteristics of aircraft at high angles of attack,with bluntness of nose tip,the magnitude of the side force and yawing moment decrease obviously.The small particle and minute asymmetry of the nose tip have great micro perturbation effect on the yaw characteristics and determinate the side force and yawing moment.