Journal of ILASS-Korea (한국분무공학회지)

Institute for Liquid Atomization and Spray Systems-Korea (한국분무공학회)
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Effects of Propellant Phases on Atmospheric Spray Characteristics of a Pintle Injector for Throttleable Rocket Engines

가변 추력용 핀틀 분사기에서 추진제 상에 따른 상압분무 특성

  • 유기정 (한국항공대학교 대학원, 현(주)스페이스솔루션) ;
  • 손민 (한국항공대학교 대학원) ;
  • ;
  • 김희동 (안동대학교 기계공학부) ;
  • 구자예 (한국항공대학교 항공우주 및 기계공학부)
  • Received : 2016.01.14
  • Accepted : 2016.02.23
  • Published : 2016.03.31
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Abstract

Atmospheric spray characteristics were experimentally compared between liquid-gas and liquid-liquid sprays of a pintle injector. In order to study spray characteristics, water and air were used as the simulants and the visualization technic was adopted. Spray images were acquired by using a backlight method by a high-resolution CMOS camera. As a result, when the pintle opening distance increased, liquid sheets became unstabled and fluttering droplets increased. In the liquid-gas case, the breakup performance increased as the pressure of gas injected from the annular orifice increased. In the liquid-liquid case, atomization efficiency decreased as the pressure of liquid injected from the annular orifice increased. Spray angles presented a similar trend between two cases. At the same momentum ratio, the spray angle of liquid-liquid case was lower than the angle of liquid-gas case.

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References

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