典型超声速/高超声速动导数计算方法研究  

Computing dynamic derivatives for supersonic and hypersonic models based on local piston theory

作　　者：秦之轩 史爱明[1] 安富强[1] 裴扬[1] 

机构地区：[1]西北工业大学翼型叶栅空气动力学国家重点实验室,陕西西安710072

出　　处：《飞行力学》2016年第3期17-20,共4页Flight Dynamics

基　　金：国家自然科学基金资助(10602046);航天CAST-BISEE基金资助(2015MC0175);西北工业大学毕业设计重点项目资助(W002223)

摘　　要：以当地流活塞理论为基础完成超声速/高超声速动导数计算公式推导,发展了一种高效的动导数计算方法。选取1个超声速、2个高超声速动导数算例标模,计算了超声速/高超声速下飞行器动导数变化规律。研究结果表明：BFM超声速流动算例的俯仰组合动导数绝对值随马赫数的增大而减小,计算重心位置后移亦会导致俯仰组合动导数绝对值减小,纵向动稳定性降低;在0°~20°迎角范围内,高超声速流动中的尖锥和钝头旋成体俯仰组合动导数绝对值随迎角的增大而增大,纵向动稳定性增强;所提方法计算时间约为双时间动导数计算方法的1/27。Based on the local piston theory,the formulas derivation of dynamic derivatives for supersonic and hypersonic models was completed and an effective dynamic derivatives method was developed. A supersonic model and two hypersonic models were selected and their dynamic derivatives change laws were calculated. Research results show that,the absolute value of pitching dynamic derivatives of BFM supersonic flow modulus are decreased with the increasing of Mach number and the center of gravity moved backward,the longitudinal dynamic stability is reduced. The absolute value of pitching dynamic derivatives of the cone and HBS hypersonic flow modulus of pitching derivative are increased with the increasing of AOA when the AOA are located at 0° ~ 20°,the longitudinal dynamic stability is enhanced. The method takes only 1 /27 calculation time of dual time domain dynamic derivatives computing method.

关 键 词：超声速 高超声速 当地流活塞理论 动导数 

分 类 号：V211.3[航空宇航科学与技术—航空宇航推进理论与工程]