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采用数值模拟方法,研究了某亚声速涡轮内部下游导叶位势场与动叶端区二次流和叶尖泄漏流的非定常相互作用,详细分析了不同时刻的流动特性。结果表明:受下游导叶的非定常位势作用影响,动叶出口瞬时时刻二次涡结构呈现明显的周期性变化,并导致动叶出口熵增和效率均随时间改变,文中利用旋涡运动学理论对产生这一现象的流动机理进行了深入探讨。
The numerical simulation method is used to study the unsteady interaction between the potential field of the guide vane downstream of a subsonic speed turbine and the secondary flow and tip leakage flow at the end of the rotor blade. The flow characteristics at different moments are analyzed in detail. The results show that the influence of the unsteady potential of the downstream guide vane is affected by the unsteady potential of the downstream guide vane. The secondary vortex structure at the outlet of the rotor blade exhibits a significant cyclical change and the entropy increase and efficiency of the outlet of the rotor blade change with time. In this paper, The theory explores the flow mechanism that produces this phenomenon.