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Effect of nozzle geometry on critical-subcritical flow transitions

机译：喷嘴几何形状对临界-次临界流动过渡的影响

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摘要

The geometry of converging-diverging nozzles affects the conditions at which critical-subcritical flow transition occurs. The objective of this work is to develop guidelines to identify the optimum nozzle geometry that maximizes critical pressure ratio while minimizing pressure drop across the nozzle. Experiments were conducted in a facility with 1.5 in. ID PVC pipelines and a 30 ft. long lateral pipeline section. In total, 27 different nozzle geometries were tested, divided into two groups – conical and parabolic nozzles. Nozzles from the ASTAR, Deich, LJ and Moby Dick nozzle groups showed improved performance compared to other nozzle groups. It was determined that a smaller diverging angle and absence of an elongated throat resulted in a higher critical pressure ratio. Length of converging and diverging sections of nozzles did not have as much of an impact on nozzle performance as the throat diameter and shape of converging and diverging sections.
机译：会聚-扩张喷嘴的几何形状影响发生临界-亚临界流动过渡的条件。这项工作的目的是制定指导方针，以识别最佳的喷嘴几何形状，以使临界压力比最大，同时使喷嘴两端的压降最小。在具有1.5英寸ID的PVC管道和30英尺长的横向管道段的设施中进行了实验。总共测试了27种不同的喷嘴几何形状，分为圆锥形和抛物线形喷嘴两组。与其他喷嘴组相比，来自ASTAR，Deich，LJ和Moby Dick喷嘴组的喷嘴表现出更高的性能。可以确定的是，较小的发散角和不存在细长的喉咙导致较高的临界压力比。喷嘴的收敛和发散段的长度对喷嘴性能的影响不如喉部直径和收敛和发散段的形状大。

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