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为了了解大扩张波瓣流动分离及其控制方法,对引射式波瓣混合器的扩张角与波瓣内部流动分离的关系进行了研究,得到了引射式波瓣混合器出现分离的临界瓣角,进而提出了对存在流动分离的波瓣喷管进行斜切处理的方法,有效地抑制了引射式大扩张角波瓣喷管主流侧瓣顶内存在的流动分离现象,同时还对斜切波瓣与存在流动分离的基准波瓣喷管的引射系数和波瓣出口处的总压损失进行了研究。总的来看,对于存在主流侧流动分离的引射式大瓣角波瓣喷管而言,斜切处理一种是提高其引射效果、降低流动损失的合理方案。
In order to understand the flow separation and control method of large expansion lobe, the relationship between the expansion angle of the ejector lobe mixer and the flow separation inside the lobe was studied. The critical lobe Then, a method of beveling the lobed nozzle with flow separation is put forward, which can effectively restrain the flow separation existing in the apex of the main flow side of the ejecting large-angle lobed nozzle, and at the same time, The eigenvalue of the shear lobe and the reference lobed nozzle with flow separation and the total pressure loss at the lobe exit were studied. In general, for the large-bore lobed nozzle with flow separation on the mainstream side, one of the beveling treatments is a reasonable solution to improve the ejecting effect and reduce the flow loss.