VISUALIZATION OF A FREE AND IMPINGING ROUND JET

被引：168

作者：

POPIEL, CO

TRASS, O

机构：

[1] Heat Transfer Laboratory, Technical University of Poznan

[2] Department of Chemical Engineering and Applied Chemistry, University of Toronto

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 1991年 / 4卷 / 03期

关键词：

FREE ROUND JET; IMPINGING ROUND JET; SMOKE-WIRE FLOW VISUALIZATION;

D O I：

10.1016/0894-1777(91)90043-Q

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

The smoke-wire flow visualization technique was used to gain a deeper physical insight into a regular vortex structure of free and impinging round subsonic jets. The jet issued into ambient air at rest through a bell-shaped nozzle. Toroidal vortex initiation, vortex pairing, and fluid entrainment processes are visualized, with the uniformly distributed smoke filaments providing a cross-sectional view of the jet within the first few diameters. The role of large-scale toroidal vortices in the entrainment process and the separation distance between two neighboring large-scale toroidal vortices in the jet is discussed. Interaction between the ordered large-scale toroidal vortex structure and the normally impinged flat plate is shown. At low nozzle-to-plate separations (below a jet core length), the ring-shaped wall eddies induced between toroidal vortices successively diverge in the radial direction along the plate surface.

引用

页码：253 / 264

页数：12

共 34 条

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