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Портал Begell Электронная Бибилиотека e-Книги Журналы Справочники и Сборники статей Коллекции
Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Печать: 1065-3090
ISSN Онлайн: 1940-4336

Выпуски:
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Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2011003481
pages 165-183

EFFECTS OF WALL CONCAVITY ON OSCILLATIONS OF JET STREAMS FROM DIAMOND-SHAPED CYLINDER BUNDLES

Shinzaburo Umeda
Department of Architecture and Civil Engineering, Fukuyama University
Kazuaki Iijima
Technical Research Laboratories, Sanki Engineering Co., LTD, Shimotsuruma, Yamato-Shi, Kanagawa 242-0001, Japan
Kouichi Shinmura
Sanki Engineering Co., Ltd., Shimotsuruma, Yamato, Kanagawa, 242-0001, Japan
Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics University of Michigan, Ann Arbor, Michigan 48109-2125, U.S.A.

Краткое описание

The promotion of jet-stream diffusion may enhance the efficiency of mechanical performance in various industrial devices such as fluid machinery and combustion equipment. Both active and passive means were applied for the control of jet streams. Our previous studies disclosed that diamond-shaped cylinder bundles produce a self-excited oscillating jet-stream flow field having multiple uniform flow-rate groups. The present visualization work deals with flip-flop flow oscillation from a diamond-shaped cylinder bundle with wall concavity. It is disclosed that the presence of wall concavity resulted in a remarkable change in the jet-stream from the diamond-shaped cylinder bundle in higher turbulence levels and dispersion of individual jet-streams with respect to those without concavities.