Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Configuration Design, Hot-firing Test and Performance Evaluation of 200 N-Class GCH4/LOx Small Rocket Engine (Part I: A Preliminary Design and Test Apparatus)

200 N급 GCH4/LOx 소형로켓엔진의 형상설계와 성능시험평가 (Part I: 예비설계와 시험장치)

  • Kim, Young Jin (Department of Mechanical Engineering, Pukyong National University) ;
  • Kim, Min Cheol (Department of Mechanical Engineering, Pukyong National University) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2019.10.29
  • Accepted : 2020.01.08
  • Published : 2020.02.01
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Abstract

In this study, a configuration design of a CH4/LOx small rocket engine was made and test system was established for the performance evaluation. A coaxial swirl injector was chosen because of its remarkable atomization performance and low combustion instability. Three aspect ratios for the combustion chamber configuration, i.e., 1.5, 1.8, and 2.1 were also set for the comparison of the combustion efficiency. The reliability of the thrust measurement rig was enhanced by pre-and post-calibration process. From the preliminary ground hot-firing test, the measured thrust and specific impulse values were 89.2 N and 181.8 s, respectively, which were 21.6% lower than the ideal values. In addition, the efficiency of characteristic velocity was measured as 84.2%.

메탄/산소 이원추진제 소형로켓엔진의 성능평가를 위한 형상설계 및 시험평가시스템을 구축하였다. 인젝터는 추진제 미립화 성능이 우수하고, 연소불안정성이 적은 스월 동축형(swirl-coaxial) 방식을 채택하였다. 연소효율 비교를 위해 연소실의 종횡비는 1.5, 1.8, 2.1로 각각 설정하였다. 그리고 정밀추력측정장치의 측정 신뢰성을 높이기 위해 pre/post calibration을 실시하였다. 그 결과, 예비 지상연소시험에서 추력과 비추력은 89.2 N, 181.8 s로 78.4%의 효율을 가지고, 특성속도는 84.2%의 효율을 갖는 것이 확인되었다.

Keywords

References

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