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气膜冷却被广泛地应用在现代透平冷却设计中.由于叶栅环境的复杂性,叶栅气膜冷却特性与平板气膜冷却表现很不相同,主流流向压力梯度是叶栅流动的重要特征之一。本文采用PSP技术研究了不同流向压力梯度下的绝热气膜冷却效率,并同时进行了相应工况下的数值研究,来获得更详细的流场信息,以揭示流向压力梯度对气膜冷却有效度的影响机理.研究发现,低吹风比下,气膜冷却效率随流向顺压增大而提高,而高吹风比下,流向压力梯度对气膜冷却效率影响不大。
Film cooling is widely used in modern turbine cooling design.Because of the complexity of the cascade environment, the cooling performance of the cascade film is very different from that of the flat film, and the main flow pressure gradient is an important characteristic of cascade flow one. In this paper, PSP technology was used to study the adiabatic film cooling efficiency under different flow-pressure gradients, and at the same time the numerical study under the corresponding operating conditions was carried out to obtain more detailed flow field information to reveal the effect of flow pressure gradient on the film cooling effectiveness The results show that under low blowing ratio, the cooling efficiency of the film increases with the increase of the flowing pressure, while the flow pressure gradient has little effect on the film cooling efficiency under high blowing ratio.