Unthrottled Flows with Complex Background Waves in Curved Isolators
Unthrottled Flows with Complex Background Waves in Curved Isolators
复制标题
弯曲隔离器中具有复杂背景波的无节流流动
DOI：
10.2514/1.j055735
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发表时间：
2017-09-01
期刊：
影响因子：
2.5
通讯作者：
Sheng, Fa-jia
中科院分区：
文献类型：
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作者：
Huang, He-xia;Tan, Hui-jun;Sheng, Fa-jia
对弯曲隔振器内的非节流流动进行了实验和数值研究。风洞试验是在自由流马赫数为4.92下进行的。对内部流场进行了可视化和测量。在进气中观察到了较大规模的分离气泡，并发现下游通道的曲率可以通过降低分离气泡下游的局部压力来减小分离气泡的尺寸。在这些隔振器中出现了复杂的背景波，且管道曲率的增大有加剧反射冲击的趋势。特别是，在管道曲率的影响下，背景激波沿激波方向的强度分布表现出不同的特性。对于右行激波，随着管道曲率的增大，其强度分布由下降趋势变为上升趋势，而左行激波的强度总是随着速度的增加而下降。背景冲击的强度尤其与左翼经济扩张有关。
The unthrottled flows in curved isolators are studied experimentally and numerically. Wind-tunnel tests are conducted at a freestream Mach number of 4.92. The internal flowfield is visualized and measured. Large-scale separation bubbles in the inlet are observed, and the downstream duct curvature is found to be able to decrease the separation bubble size via lowering the local pressure downstream of the separation bubble. Complex background waves appear in these isolators, and the increase of duct curvature tends to intensify the reflected shocks. Particularly, the strength distributions along the shock direction of the background shocks behave differently under the influence of duct curvature. For the right-running shocks, the strength distribution changes from a descending trend to an ascending trend with the increase of duct curvature, whereas the strength of left-running shocks always descends with an increasing speed. The strength of background shocks is particularly related to the left-running expan...