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

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

DOI QR Code

Effects of an Elliptic Jet Screech Reflector on an Underexpanded Sonic Jet

타원형 제트 스크리치 반사판이 과소팽창 음속 제트에 미치는 영향

  • 김정훈 (LG전자 DA연구소) ;
  • 김진화 (서울대학교 기계항공공학부 BK21사업단) ;
  • 유정열 (서울대학교 기계항공공학부)
  • Published : 2004.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

A technique of mixing enhancement by using an elliptic jet screech reflector has been examined experimentally in an underexpanded sonic round jet where jet screech tone is generated. Since jet screech is known to enhance jet spreading, a reflector was designed to focus jet screech waves near the nozzle lip at an underexpanded jet. The reflector has an elliptic cross section of which one focus is located near the nozzle lip and the other in the jet screech source region in a plane including the jet axis. In the jet with the elliptic reflector, the mass flow rate showed a significant increase in the jet entrainment when compared to that for the small disk reflector. This was attributed to the increased screech amplitude near the nozzle lip as well as the mode change of the jet. The jet mixing was also increased by the amplified jet screech at two other underexpanded jets, but the jet oscillation mode did not change.

Keywords

References

  1. Gutmark, E., Schadow, K. C. and Yu, K. H., 1995, 'Mixing Enhancement in Supersonic Free Shear Flows,' Annual Review of Fluid Mechanics, Vol. 27, pp. 375-417 https://doi.org/10.1146/annurev.fl.27.010195.002111
  2. Schadow, K. C., Gutmark, E. and Wilson, O. K., 1989, 'Combustion Related Shear Flow Dynamics in Elliptic Supersonic Jets,' AIAA Journal, Vol. 27, No. 10, pp. 1347-1353 https://doi.org/10.2514/3.10270
  3. Guirguis, R. H., Grinstein, E. F., Young, T. R., Oran, E. S. and Kailasnath, K., 1987, 'Mixing Enhancement in Supersonic Shear Layer,' AIAA Paper 87-0373
  4. Samimy, M., Zaman, K. B. M. Q. and Reeder, M. F., 1993, 'Effect of Tabs on the Flow and Noise Field of an Axisymmetric Jet,' AIAA Journal, Vol. 31, No. 4, pp. 609-619 https://doi.org/10.2514/3.11594
  5. Ibrahim, M. K. and Nakamura, Y., 2001, 'Effects of Rotating Tabs on Flow and Acoustic Fields of Supersonic Jets,' AIAA Journal, Vol. 39, No. 4, pp. 745-748 https://doi.org/10.2514/2.1373
  6. Kim, J.-H. and Samimy, M., 1999, 'Mixing Enhancement Via Nozzle Trailing Edge Modifications in a High Speed Rectangular Jet,' Physics of Fluids, Vol. 11, No. 9, pp. 2731-2742 https://doi.org/10.1063/1.870132
  7. Raman, G. and Rice, E. J., 1995, 'Supersonic Jet Mixing Enhancement Using Impingement Tones from Obstacles of Various Geometries,' AIAA Journal, Vol. 33, No. 3, pp. 454-462 https://doi.org/10.2514/3.12598
  8. Powell, A., 1953, 'On the Mechanism of Choked Jet Noise', Proceedings of the Physical Society, 66, pp. 1039-1056 https://doi.org/10.1088/0370-1301/66/12/306
  9. Poldervaart, L. J., Wijnands, A. P. J. and Bronkhorst, L., 1973, 'Aerosonic Games with the Aid of Control Elements and Externally Generated Pulses,' AGARD CP-131, (20), pp. 1-4
  10. Nagel, R. T., Denham, J. W. and Papathanasio, A. G., 1983, 'Supersonic Jet Screech Tone Cancellation,' AIAA Journal, Vol. 21, No. 11, pp. 1541-1545 https://doi.org/10.2514/3.60153
  11. Rice, E. J. and Raman, G., 1997, 'Feedback and Receptivity During Jet Screech: Influence of an Upstream Reflector,' AIAA Paper 97-0144
  12. Glass, D. R., 1968, 'Effects of Acoustic Feedback on the Spread and Decay of Supersonic Jets,' AIAA Journal, Vol. 6, No. 10, pp. 1890-1897 https://doi.org/10.2514/3.4897
  13. Krothapalli, A., Hsia, Y., Baganoff, D. and Karamcheti, K., 1986, 'The Role of Screech Tones in Mixing of an Underexpanded Rectangular Jet,' Journal of Sound and Vibration, Vol. 106, No. 1, pp. 119-143 https://doi.org/10.1016/S0022-460X(86)80177-8
  14. Ponton, M. K. and Seiner, J. M., 1992, 'The Effects of Nozzle Exit Lip Thickness on Plume Resonance,' Journal of Sound and Vibration, Vol. 154, No. 3, pp. 531-549 https://doi.org/10.1016/0022-460X(92)90784-U
  15. Powell, A., Umeda, Y. and Ishii, R., 1992, 'Observations of the Oscillation Modes of Choked Circular Jets,' Journal of Acoustical Society of America, Vol. 92, No. 5, pp. 2823-2836 https://doi.org/10.1121/1.404398
  16. Ponton, M. K. and Seiner, J. M., 1995, 'Acoustic Study of B Helical Mode for Choked Axisymmetric Nozzle,' AIAA Journal, Vol. 33, No. 3, pp. 413-420 https://doi.org/10.2514/3.12402
  17. Gutmark, E., Schadow, K. C. and Bicker, C. J., 1989, 'Mode Switching in Supersonic Circular Jets,' Physics of Fluids, Vol. 1, No. 5, pp. 868-873 https://doi.org/10.1063/1.857384
  18. Zaman, K. B. M. Q., 1999, 'Spreading Characteristics of Compressible Jets from Nozzles of Various Geometries,' Journal of Fluid Mechanics, Vol. 383, pp. 197-228 https://doi.org/10.1017/S0022112099003833
  19. Panda, J., 1999, 'An Experimental Investigation of Screech Noise Generation,' Journal of Fluid Mechanics, Vol. 378, pp. 71-96 https://doi.org/10.1017/S0022112098003383
  20. Umeda, Y. and Ishii, R., 2001, 'On the Sound Sources of Screech Tones Radiated from Choked Circular Jets,' Journal of the Acoustical Society of America, Vol. 110, No. 4, pp. 1845-1858 https://doi.org/10.1121/1.1402620