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A Study on the Characteristics of Edgetones by High-Speed Plane Jets

고속 평면제트에 의한 쐐기음의 특성 연구

Kwon, Young-Pil;Lee, Geun-Hee;Jang, Wook;Kim, Wook
권영필;이근희;장욱;김욱

  • Published : 2001.12.01

Abstract

The impinging tones by high-speed plane jets are experimentally investigated to study the edgetone characteristics. Experiment used a slit nozzle and a wedge system to generate edgetones. The jet in the experiment is varied from low to high subsonic speed to obtain the effect of the speed on the frequency characteristics of impinging tones. The experimental data obtained previously fur edgetones and platetones by various nozzles are compared with the present edgetone data. And the condition of tone generation, the frequency ranges, the effective source point and the sound pressure level are compared and discussed. It is found that the jet speed has no diect influence on the impinging tone characteristics. Regardless of the jet speed, the effective source point is about a quarter wavelength downstream from the edge tip. With increase in jet speed, the influence of the nozzle configuration is decreased and the operating frequencies show good coincidences by normalized parameters based on the slit thickness.

Keywords

Impinging Tone;Edgetone;Plane Jet;Frequency;Impinging Jet

References

  1. 권영필, 1998, '고속충돌제트의 불안정특성(1)-평면제트-,' 대한기계학회논문집B권, 22(4), pp. 452-458
  2. Krothapalli, A., Karamacheti, K., Hsia, Y. and Baganoff, D., 1982,'Edgetones in High-Speed Flows and Their Application to Multiple-Jet Mixing,' AIAA Jr. 21, November
  3. 권영필, Powell, A., '쐐기소리에서 분류-쐐기의 상호작용과 소리의 방사,' 대한기계학회논문집 18(3), 584-590 (1994)
  4. Young-Pil Kwon,1998, 'Feedback Mechanism of Low-Speed Edgetones,' Jr. Acoust. Soc. Am. 104(4), pp. 2084-2089 https://doi.org/10.1121/1.423722
  5. Powell, A., and Unfried, H., 1964, An Experimental Study of Low Speed Edgetones. University of California, Los Angeles, Report No.64~69
  6. Kwon, Y. P., 1996, 'Phase-Locking Condition in the Feedback Loop of Low-Speed Edgetones,' J. Acoust. Soc. Am. 100(5), pp. 3028-3032 https://doi.org/10.1121/1.417114
  7. Powell, A., 1953, 'On Edge Tones and Associated Phenomena,' Acustica 3, pp. 223-244
  8. Brown, G. B., 1935, 'The Vortex Motion causing Edge Tones,' Proc. Phys. Soc. Lond. 47, pp. 493-507 https://doi.org/10.1088/0959-5309/49/5/306
  9. Holger, D. J., Wilson, T. A. and Beavers, G. S., 1977, 'Fluid Mechanics of the Edgetone,' J. Acoust. Soc. Am. 62(5), pp. 1116-1128 https://doi.org/10.1121/1.381645
  10. Crighton, D. G., 1992, 'The Jet-Edge Feedback Cycle;Linear Theory for the Operation Stages,' Jr. Fluid Mech. 234, pp. 361-391 https://doi.org/10.1017/S002211209200082X
  11. 권영필, 1995, '쐐기소리의 피드백 사이클의 위상조건,' 대한기계학회논문집(B) 제20권 제3호, pp. 1106-1113
  12. Rockewll, D., 1983, 'Oscillations of Impinging Shear Layers,' AIAA Jr., 21(5), pp. 645-661