Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2001, Volume8

Issue 2-3

110 pages

Issue price - $280.00

Sze Man Simon Chan
Department of Mechanical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, 890-0065, Japan

Shuichi Torii
Department of Mechanical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, 890-0065; and Department of Mechanical Engineering and Materials Science, Kumamoto University 2-39-1, Kurokami, Kumamoto, 860-8555, JAPAN

Toshiaki Yano
Department of Mechanical Engineering, Kagoshima University, 1-21-40 Korimoto, Kagoshima, 890-0065, Japan

An experimental study is performed to investigate effects of an active control technique proposed herein, named peripheral shear flow, on blowout limits and lift-off tendency of turbulent jet diffusion flames. This technique is achieved by ejecting air peripherally from a rectangular tube set at a position off the center of a fuel nozzle where a jet flame is formed. Here the main stream of air does not hit the flame directly but its periphery intervenes with the flame surface to form shear flows. It is found that (1) flame blowout limits and lift-off heights are extended and lowered, (2) the base of a lifted flame is anchored to positions desired by varying axial displacements of the tube, and (3) the above effects are attributed to mixing enhancement as well as the formation of large-scale vortices when this technique is applied.

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