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结合现有交变波瓣的特点对基准波瓣喷管进行处理,设计了一种新型波瓣喷管——剑形深波谷交变波瓣喷管。采用数值方法对基准波瓣喷管、平端面交变波瓣喷管、斜切交变波瓣喷管、剑形深波谷交变波瓣喷管、斜切交变波瓣喷管扇形处理的射流掺混进行模拟,研究了交变波瓣喷管高效掺混的机理。结果表明,交变波瓣喷管除了深、浅波谷之间的尾流区和较小的核心区代替了基准波瓣喷管较大的核心区以外,在侧壁尾流区产生更饱满的流向涡,以及深波谷端次流前锋的刺入或在深波谷端产生流向涡,都对提高掺混效率起重要作用。交变波瓣喷管射流掺混中横向流动程度越大造成的流动损失越大,其关系为初始流向涡量每增加0.1,总压恢复系数将减小0.0001。
In the light of the characteristics of the existing alternating lobes, the reference lobed nozzle is treated, and a new type of lobed nozzle - sword-shaped deep valleys alternating lobe nozzle is designed. The numerical method is applied to the processing of the reference lobed nozzle, flat face alternating lobed nozzle, bevelling alternating lobed nozzle, sword-shaped deep valley alternating lobe nozzle, bevelling alternating lobe nozzle fan-shaped processing The jet mixing is simulated to study the mechanism of high efficiency mixing of the alternating lobed nozzle. The results show that the alternating lobe nozzle produces more fuller fulcrum in the wail region of the sidewall besides the larger core region of the reference lobed nozzle, except for the wake region and the smaller core region between the deep and shallow troughs The flow vortices, as well as the piercing of the secondary flow front in the deep trough valley or the flow vortex in the deep trough valley, play an important role in improving the blending efficiency. The greater the loss of flow caused by the greater degree of lateral flow in the mixing of the alternating lobe nozzle jets, the greater the loss of total pressure recovery by 0.0001 for every 0.1 increase in initial flow vorticity.