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首页> 外文期刊>Journal of Heat Transfer >Film-Cooling Efficiency in a Laval Nozzle Under Conditions of High Freestream Turbulence
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Film-Cooling Efficiency in a Laval Nozzle Under Conditions of High Freestream Turbulence

机译：高自由流湍流条件下熔体喷嘴的薄膜冷却效率

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摘要

In the present work we experimentally examined the effect of enhanced freestream turbulence on the film-cooling efficiency in an axisymmetric supersonic nozzle. A considerable reduction in the film-cooling efficiency was observed with increasing level of flow turbulence, both in the subsonic and supersonic parts of the Laval nozzle. For instance, an increase in the freestream turbulence number from 0.2% to 15% resulted in more than twofold deterioration of film-cooling efficiency. A similar decrease of film-cooling efficiency was also observed under off-design flow conditions. At the same time, the increase in the freestream turbulence number had almost no effect on the recovery factor and on the distribution of static pressure over the length of the nozzle. The Kutateladze-Leont'ev asymptotic theory of gas cooling films was used to generalize the experimental data for nozzle flows with allowance for flow nonisothermality, compressibility, longitudinal pressure gradient, and high freestream turbulence number.
机译：在当前的工作中，我们实验性地研究了轴流超音速喷嘴中增强的自由流湍流对薄膜冷却效率的影响。在拉瓦尔喷嘴的亚音速和超音速部分中，随着湍流水平的增加，薄膜冷却效率大大降低。例如，自由流湍流数从0.2％增加到15％会导致薄膜冷却效率下降两倍以上。在非设计流量条件下也观察到了类似的膜冷却效率下降。同时，自由流湍流数的增加几乎对回收率和在喷嘴长度上的静压分布没有影响。气体冷却膜的Kutateladze-Leont'ev渐近理论用于概括喷嘴流动的实验数据，并考虑到流动的非等温性，可压缩性，纵向压力梯度和高自由流湍流数。

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