关键词: 超声速进气道;泄流;自起动能力;抗反压能力

Abstract: The numerical simulation of a typical 2D supersonic inlet is carried out to study the effects of the bleed position in the internal contraction section on the self-starting performance and limiting backpressure of the inlet. The results show that the mechanism of the bleed chamber to improve the self-starting performance and anti-backpressure ability of the inlet is different. The position of the bleed chamber determines the discharge of the inlet in the critical unstarting state, the critical unstarting mode and the discharge flow in the critical back pressure state, in which the discharge flow and the critical unstarting mode in the critical unstarting state jointly affect the self-starting performance of the inlet， while the anti-back pressure ability of the inlet is mainly determined by the discharge flow of critical back pressure state. In the scope of this study， when the dimensionless axial distance from the leading edge of the discharge chamber to the intersection point of the inlet entrance and the inlet down wall is equal to 0.31, the self-starting performance of the inlet is the best, and the critical pressure ratio and total pressure recovery coefficient are the highest when it is equal to 0.15.

Key words: Supersonic inlet;Bleed;Self-start ability;Anti-backpressure ability