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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (4): 123545-123545.doi: 10.7527/S1000-6893.2019.23545

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Extremely efficient prediction technique of dynamic derivatives for super/hypersonic flight vehicles

LI Zhengzhou1,2, GAO Chang1, XIAO Tianhang2, MA Zicheng1, XIAO Jiliang2, ZHU Jianhui2   

  1. 1. Science and Technology on Scramjet Laboratory, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. Aeronautics Engineering College, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2019-10-08 Revised:2019-11-29 Online:2020-04-15 Published:2020-04-22
  • Supported by:
    Foundation of Science and Technology on Screamjet Laboratory(STS-MY-2018-007)

Abstract: In the early stage of aircraft design, it is necessary to predict the dynamic stability derivatives under a large number of operating conditions. An extremely efficient prediction technique of dynamic stability derivatives for high-speed flight vehicles is developed in this paper. Firstly, based on the local piston theory, the unsteady aerodynamics of high-speed flight vehicles can be divided into the non-disturbance aerodynamic component and the disturbance aerodynamic component. Secondly, the local surface inclination method and the isentropic flow relation after a shock wave are employed to solve the surface flow variables, and then the unsteady aerodynamic forces are calculated by combining the unsteady motion. Finally, the dynamic derivatives are extracted and identified from unsteady aerodynamic forces using the undetermined coefficient method. Our method overcomes the time-consuming of the traditional CFD method that is dependent and coupled with numerical simulation flow field variables. Typical test cases indicate that our method can predict the trend of dynamic derivatives well under both supersonic and hypersonic conditions. At last, our method is successfully applied to dynamic derivatives prediction of flight vehicles with complex shape, and the error sources with CFD method are discussed. The efficient dynamic derivatives prediction technique in this paper can be used to screen layout of high-speed flight in conceptual design stage.

Key words: dynamic derivatives, forced vibration motion, dynamic stability, local piston theory, hypersonic, supersonic

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