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가변 추력용 핀틀 분사기에서 추진제 상에 따른 상압분무 특성
유기정 ( Kijeong Yu ),손민 ( Min Son ),( Kanmaniraja Radhakrishnan ),김희동 ( Heuy Dong Kim ),구자예 ( Jaye Koo ) 한국분무공학회 2016 한국액체미립화학회지 Vol.21 No.1
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.
핀틀 인젝터의 개도가 액체-기체 상압 분무에 미치는 영향
유기정(Kijeong Yu),손민(Min Son),구자예(Jaye Koo) 한국항공우주학회 2015 韓國航空宇宙學會誌 Vol.43 No.7
모사 추진제로 물과 공기를 사용하여 상압 상태에서 핀틀 인젝터의 개도가 액체-기체분무에 미치는 영향을 실험적으로 연구하였다. 액체 공급 압력은 0.1 bar에서 1.0 bar 까지, 핀틀 개도는 0.2 mm에서 1.0 mm 까지의 다양한 분사 상태에서 유량 계수와 질량 유량을 계산하였다. 분사각은 역광 기법을 이용하여 얻어진 분사 이미지에서 측정하였다. 핀틀 개도가 0.2 mm인 경우 정상적인 액막이 형성되지 않았고, 비 균질한 분사를 보였다. 이는 연소실 내부에 연소 불안정을 가져올 수 있다. 핀틀 개도를 이용하여 계산된 운동량 플럭스 비는 분사각에 약한 상관관계를 갖고 있고, 운동량 비는 분사각과 강한 상관관계를 갖고 있다. 운동량이 증가할수록 분사각은 지수 함수적으로 감소하였고, 분사각은 약 40도로 수렴하였다. Effects of opening distance on liquid-gas spray of pintle injector were experimentally investigated under atmospheric condition by using water and air as simulants of propellants. Discharge coefficients(C<SUB>d</SUB>) and mass flow rates were calculated with various injection conditions; 0.1 bar - 1.0 bar for water pressures and 0.2 mm - 1.0 mm for the pintle opening distances. Spray angles were measured from the spray images that were obtained by a shadowgraphy method. When opening distance is 0.2 mm, liquid sheet is not formed properly and it show non-uniform spray. than it can result in combustion instability. it has a weak correlation between the momentum flux ratio and the spray angle, while it has a strong correlation between the momentum ratio and spray angle. Finally the spray angles reduced exponentially when the momentum ratio increased and the spray angles converged to about 40 degrees.
발사체 인젝터 특별세션 : 액체-액체 모사추진제를 사용한 핀틀 인젝터의 분무 특성
유기정 ( Kijeong Yu ),손민 ( Min Son ),( Kanmaniraja Radhakrishnan ),구자예 ( Jayae Koo ) 한국액체미립화학회 2015 한국액체미립화학회 학술강연회 논문집 Vol.2015 No.-
Spray angle characteristics of a pintle injector using liquid-liquid phases were compared with the characteristics of the injector using liquid-air phases. The spray angles were measured from spray images captured by backlight method using a CMOS camera. The water and air were injected in the pressure range of 0.1 bar - 1.0 bar and pintle opening distances were controlled from 0.2 mm to 1.0 mm. The spray angles of liquid-liquid phase decreased linearly as the momentum ratios increased. While the spray angle characteristics of liquid-liquid phases had similar trend as the characteristics of liquid-gas, break up characteristics were different.