中文摘要：

针对三维侧压进气道开展了方转圆研究,通过数值模拟对比了矩形出口、隔离段方转圆和内收缩段方转圆这3种方案进气道的基本性能和流场结构,分析了方转圆过程对进气道性能和流场结构的影响规律.结果表明：采用方转圆隔离段的三维侧压进气道总体性能要优于原型进气道,而在两个方转圆方案中,将内收缩段和隔离段视为一个整体进行方转圆的方案3,要优于从喉部截面开始方转圆的方案2;3种方案进气道隔离段二次流动的共同特点是在底板附近存在方向相反的两个流向涡,它们的强弱关系决定了底板低能流动的分布;始于侧板前缘根部的方转圆过程较始于喉部的方转圆过程对靠近侧板的流向涡的增强作用更大,这个涡提供的“下卷”作用具有改善角区低能流动的效果.

英文摘要：

The effect of rectangular-to-circular on the performance and flow field of three-dimensional sidewall compression hypersonic inlet is investigated in this article.The basic performance and flow field of the original inlet with rectangular out-let,the inlet rounding from throat,and the inlet rounding from the front of sidewall root,are compared with each other through numerical simulation.The results reveal that the gross performance of inlets with rectangular-to-circular isolator are better than the original inlet,and in the two rectangular-to-circular inlets,Scheme 3 that takes the internal converging portion and isolator as a whole is superior to Scheme 2 that rounding from throat,the common characteristics of secondary flow in the isolator of the three schemes is that nearby the bottom wall exist two opposite flow-directional vortices,and the relationship between them determines the distribution and development of the bottom low-energy flow region,rectangular-to-circular process from the front of side wall root has a stronger enhancement on the side wall vortex than that from throat,which produces the roll-down effect so that it can improve the corner low-energy flow.