Effects of Configuration and Slot Angle of the Bleed System on the Performance of Hypersonic Inlet

The numerical simulation of a typical two-dimensional hypersonic inlet was carried out to study the effects of configuration and slot angle of the bleed system on the performance of hypersonic inlet. It is found that the use of more bleed slots can achieve a greater increase in total pressure recovery coefficient with less flow loss on the premise that the total flow path height remains unchanged, and the greatest total pressure recovery can be achieved with single flow path height lower than 0.4H_th. Furthermore the bleed flow rate decreases with the increase of the slot angle when 30° ≤ θ ≤ 120°, and increases when 120° ≤ θ ≤ 150°. The result also shows that the total pressure recovery coefficient of throat decreases while the throat pressure ratio increases with the increase of the slot angle when 30° ≤ θ ≤ 150°. Therefore, the use of multiple bleed slots with single flow path height of 0.2H_th to 0.4H_th is re-commended, and the slot angle can be selected according to actual needs.