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本文利用数值模拟方法详细研究了缩放型流道叶栅中从六个不同轴向位置处以不同的质量流量比喷射冷气对叶栅流场性能的影响,对比分析了能量损失系数、叶表静压分布、流道内马赫数分布等,结果表明冷气喷射对叶栅性能的影响和内伸波的影响是不同的。叶栅性能的变化主要是由于冷气喷射导致叶型损失的变化引起的,当冷气从吸力面内伸波作用位置附近及前缘滞止线附近喷射时,冷气与主流的掺混剧烈且持续到叶栅出口处,使得叶栅损失增加;当冷气从压力面和吸力面喉口位置处射流时,叶栅损失减小。在吸力面内伸波反射点附近射流时,由于冷气的滞止作用使得冷气孔前的压力增大,进而减小内伸波前后压差,减弱内伸波强度。
In this paper, numerical simulation is used to study the influence of jet cooling air flow on the flow field of cascade at different mass flow ratios at six different axial positions in a scaled flow path cascade. The energy loss coefficient, Distribution and Mach number distribution within the runner. The results show that the effect of cold air injection on the performance of cascades is different from that of impulse waves. The change of cascade performance is mainly caused by the change of the airfoil loss due to the air-jet injection. When the air-cooled air is jetted from the position near the pull-in wave in the suction surface and near the stagnation line of the front edge, the air- At the outlet of the cascade, the loss of the cascade increases. When the air is jetted from the pressure and suction throat, the cascade loss decreases. When the jet near the reflection point of the stretching wave in the suction surface is jetted, the pressure before the cold air hole increases due to stagnation of the cooling air, thereby reducing the pressure difference before and after the inward extension wave and weakening the intensity of the inward extension wave.