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首页> 外文会议>ASME turbo expo >FREE-STREAM EFFECTS ON THE COOLING PERFORMANCE OF CYLINDRICAL AND FAN-SHAPED COOLING HOLES
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FREE-STREAM EFFECTS ON THE COOLING PERFORMANCE OF CYLINDRICAL AND FAN-SHAPED COOLING HOLES

机译：自由流效果对圆柱形和扇形冷却孔的冷却性能

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摘要

From literature and our own studies it is known that the effects of hot gas cross-flow and in particular the turbulence of the hot gas flow highly influence the spreading of the coolant in the near hole vicinity. Moreover, the velocity of the hot gas flow expressed by a hot gas Mach number obviously plays a much more important role in case of diffuser holes than with simple cylindrical holes. To realize a certain blowing rate, a higher pressure ratio needs to be established in case of higher Mach numbers. This in turn may strongly affect the diffusion process in the expanded portion of a fan-shaped cooling hole. The said effects will be discussed in great detail. The effects of free-stream Mach number and free-stream turbulence, including turbulence intensity, integral length scale, and periodic unsteady wake flow will be considered. The comparative study is performed by means of discharge coefficients and by local and laterally averaged adiabatic film cooling effectiveness and heat transfer coefficients. Both cooling holes have a length-to-diameter ratio of 6 and an inclination angle of 30°. The fan-shaped hole has an expansion angle of 14°. The effect of the coolant cross-flow at the hole entrance is not considered in this study, i.e. plenum conditions exist at the hole entrance.
机译：从文献和我们自己的研究中，已知热气体交叉流动的影响以及特别是热气流的湍流高度影响了近孔附近的冷却剂的扩散。此外，在漫射孔的情况下，由热气马赫数表示的热气体流量的速度显然比使用简单的圆柱孔在漫射孔的情况下发挥更重要的作用。为了实现某种吹入率，需要在高马赫数的情况下建立更高的压力比。这又可能强烈地影响扇形冷却孔的膨胀部分中的扩散过程。将详细讨论所述效果。将考虑自由流马赫数和自由流湍流的影响，包括湍流强度，积分长度和周期性不稳定唤醒流程。通过放电系数和局部和横向平均的绝热膜冷却效果和传热系数进行比较研究。两个冷却孔的长度至直径比为6和倾斜角度为30°。扇形孔的膨胀角为14°。在该研究中不考虑冷却剂交叉流动在孔入口处的效果，即在孔入口处存在压力局部条件。

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