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针对涵道比为8的涡扇发动机无阻流门叶栅式反推装置,利用CFD技术,计算分析了二次射流孔的位置、角度、孔数以及流量对反推力性能和外涵通道内流场流动特征的影响。计算结果表明:外涵流体与二次射流相互作用后,在二次射流下游产生了一个主涡和副涡,阻碍外涵气体向下游流动;射流孔位置对涡扇发动机的影响不仅体现在反推力效率,而且影响上游风扇后的气体压力不均匀度和背压;二次流射流角度对反推力性能的影响在诸多影响因素中占主导地位,存在一个最佳射流角度;二次流质量流量增加,反推力效率呈增加趋势;二次流入射孔的个数关系到相邻入射气流在周向的覆盖程度,从而影响反推效率;二次流射流位置、角度以及流量对反推性能的影响是相互耦合的,在反推力装置设计时需要综合考虑三者间的相互影响;在研究参数范围内,最佳的射流孔位置范围L=110mm~150mm,最佳射流角度α在10°~20°范围内。
Aiming at the unvented vane cascade thrust reverser of turbofan engine with a bypass ratio of 8, the position, angle and hole number of secondary jet hole and the effect of flow rate on thrust reversal performance and external flow channel Effect of field flow characteristics. The calculated results show that the interaction between the external fluid and the secondary jet produces a main vortex and a secondary vortex downstream of the secondary jet, hindering the outward flow of the external gas. The position of the jet orifice on the turbofan engine is not only reflected in the anti Thrust efficiency, but also affect the gas pressure non-uniformity and back pressure after the upstream fan; the influence of the secondary jet angle on the thrust performance dominates in many factors, there is an optimum jet angle; secondary flow mass flow The number of secondary inflow holes is related to the circumferentially coverage of the adjacent incident airflow and thus affects the efficiency of the thrust reversal; the position, angle and flow rate of the secondary flow jet to the performance of the reverse thrust In the design of thrust reverser, the interaction between the three should be considered comprehensively. Within the range of the research parameters, the optimal jet orifice location range L = 110mm ~ 150mm, the best jet angle α at 10 ° ~ 20 ° range.