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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。
For the three-dimensional side-pressure inlet, a round-turning study was carried out. The numerical simulation was performed to compare the basic performance and flow field structure of the inlet of the rectangular outlet, the segmented and the contracted segments. The effect of square turn process on the performance of inlet and the structure of flow field. The results show that the overall performance of the three-dimensional side-pressure inlet with side-to-side circular isolation section is better than that of the prototype inlet section. In the two side-turn scheme, the inner contraction section and the isolation section are regarded as a whole. Circular scheme 3 is superior to scheme 2 that turns from the beginning of the throat section. The common characteristic of the secondary flow of the three isolation inlet sections of the three schemes is that there are two flow vortices in opposite directions near the bottom plate, and their strong Weak relation determines the distribution of low-energy flow in the floor. The square-turn process from the root of the front side of the side plate enhances the flow vortex near the side plate more than the square-turn process from the throat. The “ Under the roll ”effect has the effect of improving low-angle corner flow.