Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Experimental Investigation on Combustion Characteristics of Liquid Kerosene and Gelled Kerosene Using Shear Coaxial Injector

전단동축인젝터를 이용한 액상 케로신 및 젤 케로신의 연소특성에 대한 실험적 연구

  • Han, Seongjoo (Center for Reliability Engineering in Mechanical and Aerospace Industry, Korea Aerospace University) ;
  • Moon, Heejang (School of Mechanical and Aerospace Engineering, Korea Aerospace University)
  • Received : 2020.03.01
  • Accepted : 2020.04.19
  • Published : 2020.06.30
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Abstract

In this study, a hot-firing test of a lab-scale gel rocket motor using liquid kerosene and gelled kerosene as fuel was performed in order to analyze the discrepancy of the static and dynamic pressure between the two fuels. The static pressure, characteristic velocity, and characteristic velocity efficiency of the liquid kerosene and gelled kerosene did not show any significant difference. However, in the case of dynamic pressure characteristics, the pressure oscillation amplitude in a specific high frequency region of the gelled kerosene demonstrated a significantly higher amplitude than liquid kerosene case. This is considered to be the effect of an intrinsic combustion mechanism of the gel propellant, and it can be postulated that this may act as a dominant factor influencing the high frequency combustion instability of the gel rocket motor.

본 연구에서는 lab-scale 젤로켓모터를 이용하여 액상 케로신 연료와 이를 젤화 시킨 젤 케로신 연료의 연소시험을 수행함으로써, 각 연료별 연소실 정압특성 및 동압특성에 대해 분석하였다. 액상 케로신과 젤 케로신의 정압, 특성속도 및 특성속도 효율은 예상외로 큰 차이를 보이지 않음을 확인하였다. 그러나 액상 케로신과 젤 케로신의 동압 특성을 비교한 결과, 특정 고주파수 영역에서 젤 케로신의 압력 진폭이 액상 케로신 대비 증가하는 것을 확인하였다. 이는 젤 추진제의 고유 연소 메커니즘에 기인한 특성으로 여겨지며, 이들 압력 섭동 진폭이 추후 젤로켓모터의 고주파 연소불안정에 영향을 미치는 주요 인자로 적용될 가능성이 클 것으로 판단되었다.

Keywords

Acknowledgement

본 논문은 미래창조과학부의 지원(NRF-2017M1A3A3A02016561) 및 서울대학교 차세대 우주 추진 연구센터와 연계된 미래창조과학부의 재원으로 한국연구재단의 지원을 받아 수행한 선도 연구센터지원사업(과제번호: NRF-2013R1A5A1073861)을 받아 수행된 연구로서 지원에 감사드립니다.

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