喷嘴取向对椭圆型三自由度射流混合特性影响的实验研究

Ella M. Morris, Seyed Sobhan Aleyasin, Neelakash Biswas, M. Tachie
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引用次数: 2

摘要

在三种喷嘴构型下,研究了喷嘴取向对椭圆型三自由射流湍流特性的影响。第一个配置有三个喷嘴都沿着小平面(3_Minor),第二个配置有两个喷嘴沿着小平面和一个沿着主平面(2_Minor_1_Major),最后一个配置有一个喷嘴沿着小平面和两个沿着主平面(1_Minor_2_Major)。实验采用锐线收缩的改进型喷嘴进行,喷嘴与喷嘴之间的距离为4.1,喷嘴等效直径为9 mm,雷诺数为10,000。讨论了喷嘴取向对平均速度、湍流强度和雷诺数剪切应力的影响。利用速度衰减、射流扩散、合并点、结合点和潜在芯长等参数表征了喷嘴取向对混合性能的影响。结果表明:3_Minor结构的潜在核长更短,并合点位置更近,表明在会聚区域混合速度更快;利用两点相关、偏度和平整度因子,深入研究了喷嘴方向对湍流结构和高阶湍流统计的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Experimental Investigation of Nozzle Orientation Effects on Mixing Characteristics of Elliptic Triple Free Jets
An experimental investigation of nozzle orientation effects on turbulent characteristics of elliptic triple free jets was carried out for three nozzle configurations. The first configuration had all three nozzles oriented along the minor plane (3_Minor), the next had two nozzles oriented along the minor plane and one along the major plane (2_Minor_1_Major) and the last configuration had one nozzle oriented along the minor plane and two along the major plane (1_Minor_2_Major). The experiments were conducted using modified contoured nozzles with a sharp linear contraction for a nozzle-to-nozzle distance of 4.1, a nozzle equivalent diameter of 9 mm and a Reynolds number of 10,000. The effects of nozzle orientation on the mean velocity, turbulence intensity and Reynolds shear stress were discussed. The velocity decay, jet spread, merging point, combined point and potential core length were used to characterize the effects of nozzle orientation on the mixing performance. The results show that the 3_Minor configuration had shorter potential core length and closer merging point location which are indicative of a faster mixing in the converging region. Two-point correlation, skewness and flatness factors were used to provide insight into the effects of nozzle orientation on turbulence structure and higher order turbulence statistics.
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