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The Self-Induced Oscillations of the Under Expanded Jets Impinging Upon a Cylindrical Body  

Kim, Heuy-Dong (School of Mechanical Engineering, Andong National Univrsity)
Hideo Kashimura (Department of Control and Information Systems Engineering, Kitakyushu College of Technology)
Toshiaki Setoguchi (Department of Mechanical Engineering, Saga University)
Publication Information
Journal of Mechanical Science and Technology / v.16, no.11, 2002 , pp. 1448-1456 More about this Journal
Abstract
The present study addresses the flow characteristics involved in the self-induced oscillations of the underexpanded jet impinging upon a cylindrical body. Both experiment and computational analysis are carried out to elucidate the shock motions of the self-induced oscillations and to find the associated major flow factors. The underexpanded sonic jet is made from a nozzle and a cylindrical body is placed downstream to simulate the impinging jet upon an obstacle. The computational analysis using TVD scheme is applied to solve the axisymmetric, unsteady, inviscid governing equations. A Schlieren system is employed to visualize the self-induced oscillations generated in flow field. The data of the shock motions are obtained from a high-speed video system. The detailed characteristics of the Mach disk oscillations and the resulting pressure variations are expatiated using the time dependent data of the Mach disk positions. The mechanisms of the self-induced oscillations are discussed in details based upon the experimental and computational results.
Keywords
Underexpanded Jet; Jet Impingement; Supersonic Flow; Mach Disk; Compressible Flow; Unsteady Flow; Self-Induced Oscillation;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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