NUMERICAL STUDY OF RAMP-BASED SHOCK-INDUCED SEPARATION CONTROL IN HYPERSONIC FLOWS

The shock-induced boundary-layer separation creates undesirable phenomena in supersonic/hypersonic flow applications such as shock unsteadiness, enhanced surface drag, and pressure recovery losses. Thus, the present investigation is carried out to control the shock-induced boundary-layer separation in a two-dimensional ramp configuration. Two flow-control techniques, namely pressure feedback technique (PFT) and recirculation cavity technique (RCT), are tested, and their separation controllability is compared. Implementing these flow-control techniques introduces addi-tional injection shock in the shock structure of the ramp-induced shock wave boundary-layer interaction. The point of upstream influence is found to shift downstream with the control technique implementation due to the shortened separation region. In the present investigation, PFT and RCT lessen the length of the separation bubble by 12.15% and 31.42%, respectively, considering similar dimensions of PFT and RCT. For identical flow areas, PFT and RCT offer similar separation controllability.