Journal of Mechanical Science and Technology

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지

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)
  • Published : 2002.11.01
Download PDF
⟨ Previous Next ⟩

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

References

  1. Addy, A.L., 1981, 'Effect of Axisymmetric Sonic Nozzle Geometry on Mach Disk Characteristics,' AIAA Journal, Vol. 19, No. 1, pp. 121-122 https://doi.org/10.2514/3.7751
  2. Gummer, J.H. and Hunt, B.L., 1974, 'The Impingement of Non-Uniform, Axisymmeteric, Supersonic Jets on a Perpendicular Flat Plate,' Israel J. Tech., Vol. 12, pp. 221-235
  3. Iwamoto, J., 1990, 'Impingement of Under-Expanded Jets on a Flat Plate,' ASME J. Fluids Eng., Vol., 112, pp. 179-184 https://doi.org/10.1115/1.2909385
  4. Jennions, I.K. and Hunt, B.L., 1980, 'The Axisymmetric Impingement of Supersonic Air Jets on Cones,' Aeronautical Quarterly, Feb., pp. 26-39
  5. Jungowski, W.M., 1978, 'Some Self-Induced Supersonic Flow Oscillations,' Progress in Aero-space Sciences, Vol. 18, pp. 151-175 https://doi.org/10.1016/0376-0421(77)90005-7
  6. Kim, H.D. and Matsuo, K., 1992, 'Measurement of Oscillating Shock Wave in Supersonic Nozzle,' Proceedings of 6th International Sym-posium on Flow Visualization, pp. 612-616
  7. Kim, H.D., Kashiumra, H. and Setoguchi, T., 2001b, 'Suppression of the Self-Induced Oscilla-tions of the Underexpanded Jets Impinging upon an Object,'8th International Symp. on Sound and Vibration, June, 2001, Hongkong
  8. Kim, H.D., Lee, K.H. and Setoguchi, T., 2001b, 'Study of the Supersonic Dual Coaxal Jets,' 40th AIAA Aerospace Sciences Meeting, Reno, Nevada, Jan 2002 (submitted.)
  9. Lamont, P.J. and Hunt, B.L., 1980, 'The Impingement of Underexpanded, Axisymmetric Jet on Perpendicular and Inclined Flat Plates,' J. Fluid Mech., Vol. 100, Part 3, pp. 471-511 https://doi.org/10.1017/S0022112080001255
  10. Nishida, M. and Matsumura, Y., 1994, 'Numerical Simulation of a Supersonic Free Jet Impingement on a Flat Plate,' Computational Fluid Dynamics, Vol. 3, pp. 175-186
  11. Powell, A., 1988, 'The Sound-Producing Oscillation of Round Underexpanded Jets Imping-ing on Normal Plates,' J. Acoust. Soc. America, Vol. 83, No. 2, pp. 515-533 https://doi.org/10.1121/1.396146
  12. Sod, G.A., 1977, 'A Numerical Study of a Converging Cylindrical Shock,' J. Fluid Mech., Vol. 83, Part 4, pp. 785-794 https://doi.org/10.1017/S0022112077001463
  13. Yee, H.C., 1987, 'Upwind and Symmetric Shock-Capturing Schemes,' NASM TM 89464, pp. 1-127