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为了缩短超燃冲压发动机隔离段长度以及提高它的耐反压能力,采用数值模拟方法研究了一种带抽吸狭缝的新型短隔离段,获得了隔离段的缩短程度以及耐反压能力提高的程度。结果表明,通过流向狭缝抽吸隔离段角流区内的低能附面层,可不降低隔离段耐反压能力而将其长度缩短30%左右。同一隔离段采用狭缝抽吸后,能够承受的最大反压从来流静压的3.46倍上升到3.74倍,提高了8%左右。合理的狭缝位置应在厚附面层一侧的隔离段前部角流区内,前倾角对隔离段性能的影响呈非线性特征,抽吸背压在亚临界范围时对隔离段性能的影响较明显,而在超临界范围时的影响则不明显。
In order to shorten the length of the isolation section of scramjet and improve its anti-backpressure capability, a new type of short isolation section with suction slit was studied by numerical simulation. The shortening of isolation section and the improvement of anti-backpressure capability Degree. The results show that the length of the low-energy interface layer can be shortened by about 30% without reducing the anti-backpressure capability of the isolation section by pumping the low-energy surface layer in the angular flow area of the isolation section through the slit. The same isolation segment with slit suction, the maximum pressure that can withstand the static flow pressure from 3.46 times to 3.74 times, increased by about 8%. Reasonable slit position should be in the thick surfacing zone in front of the isolation section on the side of the thick surfacing layer. The effect of anteversion on the performance of the isolation section is nonlinear. When the suction pressure is in the subcritical range, the performance of the isolation section The effect is more obvious, but the influence in the supercritical range is not obvious.