导航

ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2020, Vol. 41 ›› Issue (4): 123588-123588.doi: 10.7527/S1000-6893.2019.23588

• Fluid Mechanics and Flight Mechanics • Previous Articles     Next Articles

Characteristics of air-breathing hypersonic vehicle in force-pitch and free-roll coupling motion

CONG Rongfei1, YE Youda2,3, ZHAO Zhongliang1   

  1. 1. High Speed Aerodynamics Institute, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    2. State Key Laboratory of Aerodynamics, China Aerodynamics Research and Development Center, Mianyang 621000, China;
    3. National Laboratory for Computational Fluid Dynamics, Beijing 100083, China
  • Received:2019-10-17 Revised:2019-12-04 Online:2020-04-15 Published:2019-11-28

Abstract: In this paper, the pitch/roll coupling motion of an air-breathing hypersonic aircraft similar to the SR-72 configuration is studied. Through the numerical simulation, the static stability, dynamic stability and the two-degree-of-freedom coupling dynamic stability under the forced pitching/free rolling motion are obtained. The influence of rotary inertia and pitch frequency on the coupling motion is studied, and the mechanism of coupling motion is analyzed. It is found that although the model has both static and dynamic rolling stability, in the process of forced pitch/free rolling motion, small amplitude oscillations and large amplitude oscillations occur alternately in the rolling channel, the maximum roll angle exceeds 70°. The small amplitude oscillation occurres in the upper half period of the pitch oscillation, the oscillation frequency decreases with the increase of axial inertia, the amplitude increases with the pitching oscillation frequency. The large amplitude oscillation occurred in the lower half period of the pitch oscillation, the amplitude is basically unchanged, while the oscillation frequency is consistent with the pitch oscillation. This phenomenon is basically unaffected by inertial coupling, and can be considered to be dominated by aerodynamic forces.

Key words: air-breathing hypersonic vehicle, pitch and roll coupling motion, static stability, dynamic stability, double degree-of-freedom

CLC Number: