Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Comparison between GOx/Kerosene and GN2O/Ethanol Reactive Spray in a Subscale Liquid Rocket Engine

축소형 액체로켓엔진에서 기체산소/케로신 및 기체아산화질소/에탄올 연소 분무의 비교

  • Choi, Songyi (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Shin, Bongchul (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Lee, Keonwoong (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kim, Dohun (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Koo, Jaye (School of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Park, Dong-Kun (Satellite.EW System Group, ISR.PGM R&D Center)
  • Received : 2015.06.01
  • Accepted : 2015.07.06
  • Published : 2015.08.01
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Abstract

Reactive sprays of two propellant combinations(GOx/kerosene and $GN_2O$/ethanol) were observed and compared with each other as a basic research of visualizing supercritical combustion. A shadowgraph imaging method was used to visualize the reactive sprays, and shadowgraph images were converted to density gradient magnitude images to analyse the structure of reactive sprays. The gas-liquid interface of GOx/kerosene spray showed rougher boundary and steeper density gradient near the injector face than the $N_2O$/ethanol at similar combustion chamber pressure. Spray core length was calculated from averaged density gradient magnitude images and it was revealed that spray core length of GOx/kerosene was shorter than that of $GN_2O$/ethanol, although momentum flux ratio of GOx/kerosene propellant combination was lower.

초임계 연소에 대한 기초연구로써 축소형 액체 로켓 엔진에서 기체산소/케로신, 기체아산화질소/에탄올 추진제 조합의 정상상태 연소의 분무를 관찰하고 비교하였다. 분무의 가시화에는 shadowgraph 기법을 사용하였으며 실험결과를 분석하기 위해 shadowgraph를 후처리하여 밀도구배강도 이미지를 사용하였다. 정상상태 연소압력이 동일한 조건에서 기체산소/케로신 추진제의 액체 제트 표면의 굴곡이 심하고 분사기 팁 근처에서 급격한 밀도구배를 보이는 것이 관찰되었다. 밀도구배강도의 평균 이미지에서 분무 중심 길이를 도출하였으며 더 낮은 운동량 플럭스 비 조건에서도 기체산소/케로신의 분무중심 길이가 더 짧은 것으로 나타났다.

Keywords

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