Numerical simulation of confined laminar jet flows

被引：0

作者：

Sarma, A.S.R. ^{[1
]}

Sundararajan, T. ^{[1
]}

Ramjee, V. ^{[2
]}

机构：

[1] Department of Mechanical Engineering, Indian Institute of Technology, Madras 600 036, India

[2] Department of Applied Mechanics, Indian Institute of Technology, Madras 600 036, India

来源：

| 1600年 / John Wiley & Sons Ltd, Chichester卷 / 33期

关键词：

Air entrainment - Aspect ratio - Bifurcation (mathematics) - Computer simulation - Confined flow - Laminar flow - Oscillations - Reynolds number - Stability;

D O I：

10.1002/1097-0363(20000715)33:53.0.co;2-%23

中图分类号：

学科分类号：

摘要：

Two-dimensional incompressible jet development inside a duct has been studied in the laminar flow regime, for cases with and without entrainment of ambient fluid. Results have been obtained for the flow structure and critical Reynolds number values for steady asymmetric jet development and for the onset of temporal oscillations, at various values of the duct-to-jet width ratio (aspect ratio). It is found that at low aspect ratios and Reynolds numbers, jet development inside the duct is symmetric. For larger aspect ratios and Reynolds numbers, the jet flow at steady state becomes asymmetric with respect to the midplane, and for still higher values, it becomes oscillatory with respect to time. When entrainment is present, the instabilities of asymmetric development and temporal oscillations occur at a much higher critical Reynolds number for a given aspect ratio, indicating that the stability of the jet flow is higher with entrainment.

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