研究了基于叶片弦长的主流雷诺数和二次流-主流流量比对冷却效率的影响，并与叶片上圆柱形孔排的气膜冷却效率分布进行了对比。
The influences of re based on the blade chord length and coolant-gas flux ratio are tested, and comparison is made between the effect of the converging-expanding hole rows and cylindrical hole rows.
机器在金属薄板上冲出一排孔。
1906年，它们可以在有排孔的传送带上被压制生产，一次十二个，此后它变得更便宜。
It became cheaper still when, after 1906, they could be extruded by perforated conveyor belts a dozen at a time.
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