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ISSN オンライン: 2642-0554

EFFECTS OF INLET CONDITIONS ON SKEWED AND PITCHED JETS IN CROSS-FLOW

James P. Johnston
Department of Mechanical Engineering Stanford University Stanford, CA 94305-3030, USA

Bruce P. Mosier
Stanford University Department of Mechanical Engineering Stanford, CA 94305-3030, USA

Zia U. Khan
AT. Kearney, Inc. 153 East 53rd Street, New York NY 10022, USA

要約

An experimental study of flow downstream of round, pitched and skewed wall-jets (vortex generating jets) is presented to illustrate the effects of changing the geometric inlet conditions of the jet-holes. In one case the jet-hole has a smoothly-contoured inlet, and in the other the inlet was a sharp-edged, sudden contraction. The test region geometry, mean jet flow and cross-flow conditions were otherwise identical.
In both cases, dominant streamwise vortex structures are seen in the boundary layer downstream; the flow and turbulence is nearly the same in the far-field starting at a location where x/D > 5. In the near-field, for x/D < 5, there are significant differences; turbulence levels are higher, and the start of the dominant vortex shape is less clear for the sharp-edged case. This is believed to be the result of flow separation and free shear layer instability inside the jet-hole which is not present for the smoothly-contoured case.