基于分布式边界层放气的激波/边界层干扰控制方法

Control Methods of Incident Shock Wave/Boundary Layer Interaction Induced by Distributed Bleed

摘要:

进气道内唇罩激波诱导产生的入射激波/边界层干扰现象(Incident Shock Wave/Boundary Layer Interaction, ISWBLI)会对进气道性能产生显著影响。为实现对进气道内 ISWBLI更有效地控制,文章通过数值仿真方法研究了分布式边界层放气的控制机理及流动控制规律。研究表明,相比单个放气腔,分布式放气能够在更广泛的激波入射位置范围内保持较好的控制效果和效率,其能够通过抑制放气缝的气流倒流现象提升对流动分离的控制能力。文章对放气腔个数和放气腔进出口面积比对分布式放气控制效果和控制效率的影响进行了讨论,最后提出一种相对最优的分布式放气方案,能够更好地满足激波入射位置在一定范围内移动时的流动控制要求。

Abstract:

The incident shock wave/boundary layer interaction (ISWBLI) induced by the cowl shock wave in the inlet has a significant impact on the performance of the intake. To achieve more effective control of ISWBLI in inlet, the control mechanism and flow control rules of distributed boundary layer bleed through numerical simulation methods is studied. The study shows that compared to a single bleed chamber, distributed bleed has better control effects and efficiency over a wider range of shock impingement positions by suppressing the backflow phenomenon in bleed slots, thus enhancing the control ability of flow separation. The impact of the number of bleed chambers and the ratio of bleed inlet and outlet areas on the control effects and efficiency of distributed bleed is discussed, and an optimal distributed bleed scheme is proposed finally, which can better meet the flow control requirements when the shock impingement position moves within a certain range.