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

The Korean Society of Mechanical Engineers (대한기계학회)
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Study of Starting Pressure of a Supersonic Ejector with a Second-Throat

이차목을 갖는 초음속 이젝터 작동압력에 대한 연구

  • 진정근 (한국과학기술원 대학원 항공우주공학) ;
  • 권세진 (한국과학기술원 대학원 항공우주공학) ;
  • 김세훈 (한국과학기술원 항공우주공학)
  • Published : 2005.08.01
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Abstract

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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References

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