针对低压涡轮级联的气动性能影响的入射适应性涡流扫描

Xuejian Li, Xinglong Fang, Le Cai, Lan Wang, Xinlei Hu, Yingjie Chen, Songtao Wang
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引用次数: 0

摘要

为了研究涡轮级环境下下游级联通道中的非稳态唤醒的输运规律,本研究以自行设计的非稳态唤醒发生器为基础,以低压涡轮级联为研究对象。研究通过实验和数值模拟相结合的方式进行。结果表明,在入射角-50°至20°范围内,叶片吸入面没有分离现象,总压力损失系数较低,级联对入射角的适应性较好。当入流为负入射角时,上游不稳定尾流对下游不稳定尾流的传输基本相同;非负入射角时也是如此。当上游非稳定唤醒在级联通道中向下传输时,级联吸入面附近的唤醒会沿着迂回路线进行,几乎不会与主流流体发生相互作用。通过数值计算得到的总压力损失波动值具有良好的周期性,因此上游尾流扫掠作用下的非稳态级联效应非常明显。
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Incidence Adaptation to the Influence of Wake Sweeps on the Aerodynamic Performance of a Low-Pressure Turbine Cascade
In order to investigate the transport law of an unsteady wake in a downstream cascade channel in a turbine stage environment, this study was based on a self-designed unsteady wake generator, and a low-pressure turbine cascade was the research object. The research was carried out through a combination of experiments and numerical simulation. The results show that in the range of −50° to 20° inflow incidence, there is no separation on the blade suction surface, the total pressure loss coefficient is low, and the cascade has good adaptability to the inflow incidence. When the incoming flow is at a negative incidence, the transport of the unsteady upstream wake to the downstream unsteady wake is basically the same; the same holds for a non-negative incidence. When the upstream unsteady wake is transported downstream in the cascade channel, the wake near the cascade suction surface follows a detour and barely interacts with the mainstream fluid. The total pressure loss fluctuation value obtained via numerical calculation shows good periodicity; therefore, the unsteady cascade effect under the action of upstream wake sweeping becomes very obvious.
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