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

  • 제29권8호
  • /
  • Pages.934-939
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  • 2005
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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이차목을 갖는 초음속 이젝터 작동압력에 대한 연구

Study of Starting Pressure of a Supersonic Ejector with a Second-Throat

  • 진정근 (한국과학기술원 대학원 항공우주공학) ;
  • 권세진 (한국과학기술원 대학원 항공우주공학) ;
  • 김세훈 (한국과학기술원 항공우주공학)
  • 발행 : 2005.08.01
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초록

Starting pressure of a supersonic ejector with a second-throat was investigated. In case of mixing chamber length longer than a critical length, starting pressure is in proportion to length of the mixing chamber. In this study, we assumed that the ejector starts when the primary supersonic flow reaches inlet of the second-throat and the distance of the supersonic flow traveling can be expressed by multiplying an empirical factor to the first diamond shock length of overexpanded flow. To calculate the overexpanded supersonic flow, a mixing model was employed to compute secondary flow pressure and the result was applied to back pressure condition of overexpanded flow calculation. In the result, for three cases of primary nozzle area ratio, we could get accurate model of predicting the starting pressure by selecting a suitable empirical factors around 3.

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참고문헌

  1. Kim, S., Jin, J. and Kwon, S., 2004, 'Development of Ejector System for Chemical Lasers Operating (II)-Optimal Design of the Second-Throat Type Annular Supersonic Ejector,' Trans. of the KSME (B), Vol. 28, No. 10, pp. 1231-1237
  2. Kim, S., Jin, J., Kwon, H. and Kwon, S., 2004, 'Development of A Rational Design Procedure of Pressure Recovery System for HPCL,' GCL-HPL 2004, XV International Symposium on Gas Flow and Chemical Lasers & High Power Laser Conference, Prague, Czech Republic
  3. Kim, S., Jin, J. and Kwon, S., 2005, 'Development of an Ejector System for Operating of Chemical Lasers (III)-Development and Performance Validation of a Full-Scale Ejector System for High Power Chemical Lasers,' Trans. of the KSME (B), Vol. 29, No. 1, pp. 9-15
  4. Kim, S., Jin, J. and Kwon, S., 2004, 'Study of Ejector System for cw High Power Chemical Lasers Operating,' KSME Spring Conference, Phoenix Park
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  6. Kim, S., Jin, J. and Kwon, S., 2005, 'Estimation of Secondary Flow Pressure of an Annular Injection Type Supersonic Ejector Using Fabri-Choking,' KSPE Spring Conference, Busan National University, submitted
  7. Kim, S., Jin, J. and Kwon, S., 2005, 'An Approximation Model of Internal Flow of a Supersonic Ejector of an Annular Injection of Primary Flow,' KSME Spring Conference, BEXCO, Busan, submitted
  8. Mikkelsen, C. D., Sandberg, M. R. and Addy, A. L., 1976, 'Theoretical and Experimental Analysis of the Constant Area, Supersonic-Supersonic Ejector,' U. S. Army Research Office Grant Number DAHC 04-75-G-0046
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