The study of self-sustained oscillating plane jet flow impinging upon a small cylinder |
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| Authors: | F-B Hsiao Y-W Chou J-M Huang |
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| Institution: | (1) Institute of Aeronautics and Astronautics, National Cheng Kung University Tainan, Taiwan, R.O.C., TW;(2) Aeronautical Research Laboratory Chung Shan Institute of Science and Technology Taichung, Taiwan, R.O.C., TW |
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| Abstract: | Experimental studies of a plane jet impinging upon a small circular cylinder are conducted by hot-wire measurements. The
cylinder is located on the jet centerline within the potential-core region. The jet–cylinder interactions on the instability
shear layer frequency, the cylinder wake shedding frequency, and the induced self-sustained oscillation phenomenon are carefully
investigated. Test data indicate that the self-sustained flow oscillation is mainly generated by the resonant effect of the
flow between the jet exit and the cylinder. Its resonant frequency is found to vary linearly and exhibits jump-stage pattern
as a function of the distance between the jet exit and the cylinder. The feedback mechanism and the hydrodynamic instability
theorem are proposed to predict correctly the frequency jump position, wave number and the convection speed of the self-sustained
oscillating flow for different jet exit velocities.
Received: 15 July 1998/Accepted: 9 December 1998 |
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