Investigation on the drag reduction and thermal protection properties of the porous opposing jet in the supersonic flow: A parametric study with constant mass flow rate

The studies of the influencing factors of the porous opposing jet on drag reduction and thermal protection have shown that an important performance of the drag reduction variation and thermal protection effect caused by structural parameters is the variation of mass flow rate. Therefore, this paper takes the mass flow rate of the porous opposing jet as the main influencing parameter, and discusses the influence of the variation of different structural parameters on the drag reduction and thermal protection effect with the constant mass flow rate through numerical study. The obtained results show that the flow field pattern similar to the long penetration mode (LPM) in the single orifice opposing jet appears with the variation of the PR value. With the constant mass flow rate, the minimum value of the drag coefficient all appears in the transition stage from LPM to SPM, and the wall areas are all in the environment of low temperature by adjusting the structural parameters, which is the desired effect of the thermal protection.