通过附面层泄除提高定几何混压式进气道性能的方法研究

研究了附面层泄除对定几何混压式进气道起动马赫数、起动点性能和巡航点性能的影响,分析了放气槽的轴向位置、开口面积、出口面积和放气槽与当地气流夹角对进气道性能的影响,研究表明放气槽的轴向位置和出口面积对进气道性能影响较大,且在低马赫数下附面层泄除的影响更明显。最后设计了带放气槽的进气道,在典型状态下,总压恢复系数较原方案提高约7%。

Study on Improving the Performance of Mixed-Compression Inlet with Fixed-Geometry through Boundary-Layer Bleed

In this paper the effect of boundary-layer bleed is studied on the mixed-compression inlet with fixed-geometry. The variety of the inlet＇ s starting Mach number and performance in starting and cruise state is analyzed when the bleed-slot changes the axial position, exit-area, entry-area and angle be- tween bleed-slot and flow-direction. The results show that the variable axial position and exit-area is more effective to change the performance of the inlet than the variable entry-area and angle between bleed-slot and flow-direction. In low-Mach flow the effect of boundary-layer bleed is more obvious. Finally redesign the inlet with bleed-slot, and it＇s total pressure recovery coefficient increase 7% in cruise state.