The research on the influence of multi-physical effect on the dynamic stability of high speed vehicle

Abstract

In this paper, a kind of high speed vehicle similar to HTV-2 configuration is taken as the research object, and the influence of chemical non-equilibrium effect and rarefied flow effect on the vehicle's three-channel dynamic derivative and yaw channel free motion stability is studied by using the dynamic numerical simulation method based on rigid dynamic grid. The sensitivity of three-channel dynamic stability to multi-physical effects is analyzed, and the influence of multi-physical effects on the dynamic stability of high speed vehicle is obtained. The research results show that the rarefied flow effect and chemical non-equilibrium effect have a small impact on the dynamic derivatives of pitch and roll channels, and a relatively significant impact on the dynamic derivatives of yaw. Compared with the dynamic derivatives of yaw under the condition of complete gas without slip, the deviation of slip results is - 45.2%, and that of chemical non-equilibrium gas with slip results is - 65.9%; The yaw channel has dynamic stability under the condition of complete gas with slip, and the yaw dynamic stability under the condition of chemical non-equilibrium gas with slip is further enhanced, which is consistent with the stability trend represented by the dynamic derivative results; Under the condition of complete gas without slip, the result of dynamic derivative is characterized by dynamic stability, while the result of free yaw oscillation is characterized by dynamic instability; The dynamic derivatives of yaw and the numerical simulation results of free yaw under different inflow conditions show that the dynamic stability of yaw channel is more sensitive to multi-physical effects than that of pitch and roll channels.