翼吊低平尾飞机尾迹测量研究

平尾是影响全机纵向力矩的首要部件,翼吊低平尾飞机平尾处的流场受到翼身组合体尾迹的影响.为了摸清尾迹的特点,利用七孑探针测量平尾处的动压及下洗角,得到平尾处流场动压损失以及下洗角随飞机迎角变化的气动特点.结果表明:在接近最大升力系数时,平尾处流场动压损失严重,降低了平尾的气动效率,导致全机的纵向力矩失稳.研究结果对大飞机的气动特性优化工作具有指导意义.

The Survey on the wake of the civil Wing-hung and Low-HTP Airplane and the Investigation of Longitudinal Moment Characteristic

The longitudinal moment has an big influence on the stability and safety of the plane. During the research of Wing-hung and Low-HTP(horizontal tail plane) airplane the longitudinal moment stability declines along the lift increases. the HTP is an principal part which provides the longitudinal moment and the longitudinal characteristics of the whole plane is changing due to the HTP. The seven-hole probe is carried out to measure the dynamic press loss and down-wash angle of the HTP to find the reason. Results show that the loss of the dynamic press of the HTP at the angle which is before the maximum lift is bigger than original pressure. The test results are agreed with the calculated ones, and it could be used to optimize aerodynamic characteristics.