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首页> 外文期刊>Journal of aerospace engineering >Flow Control on Bowed Compressor Cascades Using Vortex Generator Jet at Different Incidences
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Flow Control on Bowed Compressor Cascades Using Vortex Generator Jet at Different Incidences

机译：涡流发生器射流在不同事故发生时对弓形压气机叶栅的流量控制

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Vortex generator jets (VGJs) have been used to suppress the flow separations in bowed compressor cascades at different incidences via numerical calculations. The results show that with momentum injection and streamwise vortex produced by VGJ, the total losses in the bowed blades effectively decrease whereas the static pressure ratios increase. For the positively bowed blade, at -5 degrees incidence, with slight flow separation, the mixing loss caused by VGJ is dominant and the loss increases by 1%; with an incidence ranging from 0 degrees to +5 degrees, the regions of the flow separations all decrease, and the total losses decrease by 2.7 and 5.4%, respectively; with the incidence increasing to +7 degrees, the separation type converts from closed to open, and the loss decreases by 6.8%; when the incidence is +10 degrees, one concentrated shedding vortex disappears, and the loss decreases by 9.27%. For the negatively bowed one, as the incidence increases from -5 degrees to +7 degrees, the flow separations are all effectively suppressed when all the separation types are closed, and the losses decrease by 2.9, 9.1, 17.5, and 19.75%, respectively. When the incidence increases to +10 degrees, however, because of the huge range of flow separation, there is no improvement in the flow field, but the total loss increases by 1.37%. (C) 2017 American Society of Civil Engineers.
机译：涡流发生器射流（VGJs）已用于通过数值计算来抑制不同频率下弓形压缩机叶栅中的气流分离。结果表明，随着动量注入和VGJ产生的涡流，弓形叶片中的总损耗有效降低，而静压比则增加。对于正弯弓叶片，入射角为-5度，气流分离很小，由VGJ引起的混合损失占主导，损失增加1％。入射角在0度到+5度之间，分流区域均减小，总损失分别减小2.7％和5.4％。随着入射角增加到+7度，分离类型从闭合转变为开放，损失减少6.8％。当入射角为+10度时，一个集中的脱落涡消失，损失减少9.27％。对于负弯弓，当入射角从-5度增加到+7度时，所有分隔类型都关闭时，流动分隔都得到有效抑制，损耗分别减少了2.9％，9.1％，17.5％和19.75％。 。但是，当入射角增加到+10度时，由于流分离的范围很大，流场没有任何改善，但总损失却增加了1.37％。 （C）2017年美国土木工程师学会。

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