基于无翼载荷的火箭橇多场耦合特性分析

Wingless payload is a common type of payload in the rocket sled test system, which is susceptible to head-up and head-down phenomena during separation due to the multi-field coupling of unsteady aerodynamics,vibration and aeroacoustic noise during the horizontal running in a wide speed domain. The,acoustic-vibration force coupling of horizontal boost glide in a wide speed domain (Mach number of 0. 4-2. 0) is numerically simulated by taking a wingless payload test system of double-track rocket sled as the research object. The results show that a low-pressure region is generated between the payload and the booster during running,and the range of action is continuously expanded with the running speed. The aerodynamic load of high-speed flow field gradually makes the rocket sled produce large deformation at the head and tail positions of the payload,which is mainly manifested as a “head-up” phenomenon. The aerodynamic noise of the horizontal booster running in the wide speed domain increases with the running speed,and the high sound pressure level region gradually expands from the center to the periphery. The relevant research can provide technical support for the design of new generation of hypersonic rocket sled test system and the high-precision ground dynamic test.