Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Effect of Nozzle Configuration and Impinging Surface on the Impinging Tone Generation by Circular Jets

충돌면과 노즐의 형상이 원형충돌제트에 의한 충돌순음 발생에 미치는 영향

  • Published : 2003.06.01
Download PDF
⟨ Previous Next ⟩

Abstract

The effect of the configuration of the nozzle and the impinging surface on the characteristics of the hole-tones has been experimentally investigated. It is found that the plate-tone is a special case of hole-tones, where the hole diameter is zero. The jet velocity range for hole-tones is divided into the low velocity region associated with laminar jet and the high velocity region with turbulent jet. The frequency of the tone is that for the shear layer instability at the nozzle exit or that attainable by a cascade of vortex pairing process with increase of the impinging distance. When the distance is longer than one diameter the frequency decreases to the terminal value near the preferred frequency of the column mode instability, in the range 0.23< $St_d$<0.53, where $St_d$ is the Strouhal number defined by $fd/U_J$, f the frequency, d the nozzle diameter, and $U_J$ the exit velocity. While the convection speed of the downstream vortex, in the present study, is almost constant at low-speed laminar jet, it increases with distance at high-speed turbulent jet. As the frequency increases, the convection speed decreases in the low frequency range corresponding to the preferred mode, in agreement with the existing experimental data for a free jet.

Keywords

References

  1. Chanaud, P. C. and Powell, A., 1965, 'Some Experiments Concerning the Hole and Ring Tone,' J. Acoust. Soc. Am. Vol. 37, pp. 901-911 https://doi.org/10.1121/1.1909476
  2. Umeda, Y., Maeda, H. and Ishii, R., 1988, 'Hole Tone Generated from Almost Choked to Highly Choked Jets,' AIAA J. Vol. 26, No.9 pp. 1036-1043 https://doi.org/10.2514/3.10009
  3. Powell, A., 1988, 'The Sound-Producing Oscillations of Round Underexpanded Jets Impinging on Normal Plates,' J. Acoust. Soc. Am. Vol. 83, No. 2, pp. 515-533 https://doi.org/10.1121/1.396146
  4. Umeda, Y., Ishii, R. and Powell A., 1991, 'Change of Oscillation Modes of Circular Underexpanded Jet by Impingement on a Small Plate,' Mem. Fac. Eng. Kyoto Univ. Vol. 53, No. 4, pp. 195-214
  5. Ho, C. M. and Nosseir, N. S., 1981, 'Dynamics of an Impinging Jet : Part I. The Feedback Phenomenon,' J. Fluid Mech. 105, pp. 119-142 https://doi.org/10.1017/S0022112081003133
  6. Kwon, Y. P. and Im J. B., 1998, 'Instability of High-Speed Impinging Jets (2)-Circular Jets-', Trans. KSME B, Vol. 22, No. 4, pp. 459-467
  7. Crow, S. C. and Champange, F. H., 1971, 'Orderly Structure in Jet Turbulence,'J. Fluid Mech. Vol. 48, No. 3, pp. 547-591 https://doi.org/10.1017/S0022112071001745
  8. Ho, C.-M. and Huang L.-S., 1982, 'Subharmonics and Vortex Merging in Mixing Layers,' J. Fluid Mech. Vol. 119, pp. 443-473 https://doi.org/10.1017/S0022112082001438
  9. Cho, S., Yoo, J. Y. and Choi, H., 1997, 'Vortex Pairing in an Axisymmetric Jet Using Fundamental and Subharmonic Forcing,' Trans. KSME B, Vol. 21, No. 10, pp. 1359-1362
  10. Gutmark, E and HO, C.-M. 1983, 'Preferred Modes and the Spreading Rates of Jets,' Phys. Fluids, Vol. 26, No. 10, 2932-2938 https://doi.org/10.1063/1.864058
  11. Krothapalli, A, Karamcheti. K, Hsia. Y, and Baganoff. D, 1983, 'Edge Tones in High Speed Flows and Their Application to Multiple Jet Mixing,' AIAA Journal, Vol. 21, pp. 937-938 https://doi.org/10.2514/3.8180
  12. Kwon, Y. P., 1996, ' Phase Criterion of the Feedback Cycle of Edgetones' Trans. KSME B, Vol. 20, No.3, pp.1106-1113
  13. Kwon, Y. P., 1998, 'Instability of High-Speed Impinging Jets (1)-Plane Jets-', Trans. KSME B, Vol. 22, No. 4, pp.452-458