Computing dynamic derivatives for supersonic and hypersonic models based on local piston theory
QIN Zhi-xuan;SHI Ai-ming;AN Fu-qiang;PEI Yang;National Key Laboratory of Aerodynamic Design and Research,NWPU;
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.
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