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结合现有交变波瓣喷管的特点对基准波瓣喷管进行处理,设计了一种新型交变波瓣喷管——剑形深波谷交变波瓣喷管.采用数值方法研究了扇形处理和斜切处理对剑形深波谷交变波瓣喷管射流掺混的作用.结果显示,随着扇形处理和斜切处理各自改型程度的增加,波峰尾流区掺混速度变快,而核心区主流完全掺混所需距离略有增加.斜切处理促进掺混能力优于扇形处理,扇形处理后引射能力和流动损失基本不变,斜切处理后引射能力和流动损失稍有减小.计算结果还表明流向涡的形态对掺混效率的影响大于流向涡的强弱.
In the light of the characteristics of the existing alternating lobe nozzle, a new type of alternating lobed nozzle, sword-shaped deep valleys alternating lobe nozzle, was designed to deal with the reference lobed nozzle.The numerical method was used to study the fan shape The results show that with the increase of the remodeling degrees of fan-shaped and bevel-cut, the mixing speed of the wavy wake region becomes faster, While the distance needed for complete mainstream blending in the core area increased slightly.The beveling treatment was better than the fanning treatment in mixing ability, the ejection ability and flow loss remained unchanged after the fanning treatment, and the ejection ability and flow loss slightly after the beveling treatment The results also show that the influence of the shape of the flow vortex on the mixing efficiency is greater than that of the flow vortex.