Near-field structure of underexpanded elliptic jets

被引：65

作者：

Mitchell, Daniel M. ^{[1
]}

Honnery, Damon R. ^{[1
]}

Soria, Julio ^{[1
]}

机构：

[1] Monash Univ, Lab Turbulence Res Aerosp & Combust, Melbourne, Vic 3004, Australia

来源：

EXPERIMENTS IN FLUIDS | 2013年 / 54卷 / 07期

基金：

澳大利亚研究理事会;

关键词：

PARTICLE IMAGE VELOCIMETRY; DYNAMICS;

D O I：

10.1007/s00348-013-1578-3

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Quantitative measurements of velocity for a low aspect ratio underexpanded elliptical jet are presented. Four jets at nozzle pressure ratios NPR = [2.2, 2.6, 3.4, 4.2] are studied for a smoothly contoured elliptical nozzle with an aspect ratio a/b = 2. High-resolution planar particle image velocimetry is used to extract information about the velocity fields and turbulent statistics. All four jets display the expected axis switching phenomenon, with the axis switching gaining strength with increasing pressure ratio. Evidence of regular reflection is seen for jets at pressure ratios of 2.6 and above. Measurements of fluctuating velocity indicate an oscillatory flapping mode in the minor axis plane for all but the highest pressure ratio. At the highest pressure ratio of NPR = 4.2, there is evidence of a cut-and-connect vortex bifurcation previously only observed for jets with higher aspect ratio.

引用

页数：13

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