To control the flow separation of a CARET inlet

the boundary layer suction slots at the throat of the inlet were designed. The commercial CFD software Fluent was used to simulate the flow field at the design point (Mach number of 2.0). Total pressure recovery and distortion at exit of inlet were used to evaluate the effectiveness of different devices. Simulation results indicated that boundary layer suction in throat can fix the normal shock in the throat and form a stable flow field. It can weaken the shockwave/ boundary layer interaction

suppress flow separation

remarkably increase the total pressure recovery and reduce the total pressure distortion at exit surface of inlet. The front placing slots at the throat section can decrease the distortion of exit surface obviously compared with a rear position. As the suction mass flow increased

the inlet performance firstly became better

and then leveled off.