Numerical Investigation on Unsteady Shock Wave/Vortex/Turbulent Boundary Layer Interactions of a Hypersonic Vehicle during Its Shroud Separation

Abstract

Hypersonic vehicles are drawing more and more attention now and for the near future, especially in the low-altitudes near space, from 20 km to 45 km. The reliable separation of the protecting shroud from the hypersonic vehicle is a prerequisite and critical issue for the success of the entire flight mission. The unsteady multi-body separation characteristics and flow characteristics of hypersonic shroud separation at Mach 7.0 are investigated based on numerical simulation in this paper. The improved delayed detached eddy simulation (IDDES) method, dynamic hybrid overset mesh method, and HLLE++ numerical scheme are used to ensure numerical accuracy. Numerical results show that there are four types of vortexes and three types of shock waves inside the shrouds during the separation process, which generate complex shock wave/vortex/boundary layer interactions. Further, an unsteady process of the expansion-transfer-dissipation of an A-type vortex is found, which is the result of strong shock/vortex/boundary layer interactions. The adverse pressure gradient is the root cause driving the generation and transfer of the A-type vortex during the shroud separation. Furthermore, the transfer process of the A-type vortex only lasts for 5.52 ms but causes a large disturbance to the aerodynamic force of the shroud. The results of this paper could provide a reference for the design of near-space hypersonic vehicles.

Flow Characteristic Study on Wake Flow of High-speed vehicles

“…In the development process of FlowStar software, a large number of standard models and engineering actual shape assessment and calibration have been carried out. Figure 4 gives out FlowStar soft thing to AIAA (Aircraft Industries Association of America) the fifth calculation flow of strength resistance prediction work conference [10] and AIAA second high The official statistical results of the lift prediction working conference [11] showed that the FlowStar software performed very well, and the results were near the statistical average of all the results of the conference, which was comparable to the well-known international CFD software in the industry [12]. (1) Strong shear layer.…”