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RESEARCH PAPERS

Three-Dimensional Vortex Structure in a Leading-Edge Separation Bubble at Moderate Reynolds Numbers

[+] Author and Article Information
Kyuro Sasaki

Department of Mining Engineering, Mining College, Akita University, Akita, 010 Japan

Masaru Kiya

Department of Mechanical Engineering, Hokkaido University, Sapporo, 060 Japan

J. Fluids Eng 113(3), 405-410 (Sep 01, 1991) (6 pages) doi:10.1115/1.2909510 History: Received July 24, 1990; Online May 23, 2008

Abstract

This paper describes the results of a flow visualization study which concerns three-dimensional vortex structures in a leading-edge separation bubble formed along the sides of a blunt flat plate. Dye and hydrogen bubbles were used as tracers. Reynolds number (Re), based on the plate thickness, was varied from 80 to 800. For 80 < Re < 320, the separated shear layer remains laminar up to the reattachment line without significant spanwise distortion of vortex filaments. For 320 < Re < 380, a Λ-shaped deformation of vortex filaments appears shortly downstream of the reattachment and is arranged in-phase in the downstream direction. For Re > 380, hairpin-like structures are formed and arranged in a staggered manner. The longitudinal and spanwise distances of the vortex arrangement are presented as functions of the Reynolds number.

Copyright © 1991 by The American Society of Mechanical Engineers
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