Pseudo Shock Wave in a Slotted Duct of Constant Area

Abstract

The flow inside a supersonic intake comprises a series of bifurcated compression waves and followed by an adverse pressure gradient region. This phenomenon referred to as pseudo shock wave (PSW). This complex flow feature mainly affects the performance and efficiency of the supersonic intake. The PSW mainly depends on various parameters like duct length and diameter, inlet and outlet conditions such as Mach number, pressure ratio, and boundary layer parameters. Understanding the flow features of PSW in a constant area duct is more important to develop a method to control to obtain optimum efficiency. There are several methods to control shock/boundary layer interaction like active or passive methods. In the present study, an attempt has been made to control pseudo shock wave using stream-wise slotted wall computationally. The Reynolds-averaged Navier–Stokes (RANS) simulation on controlled and uncontrolled pseudo shock wave has been carried out. The stream-wise slot can develop a counter rotating stream-wise vortices which energize the boundary layer and subsequently lead to smearing of shock foot and also preventing separation in the downstream region. The present simulations are carried out with a stream-wise slot in a constant area duct at different pressure ratio. The length of the pseudo shock wave is analyzed with and without slotted control.