Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Test & Evaluation for the Configuration Optimization of Thrust Chamber in 70 N-class N2H4 Thruster (Part II: Pulse-mode Performance According to the Chamber Length Variation)

70 N급 하이드라진 추력기의 추력실 최적설계와 시험평가 (Part II: 추력실 길이변화에 따른 펄스모드 성능특성)

  • Jung, Hun (Department of Mechanical Engineering, Graduate School, Pukyong National University) ;
  • Kim, Jong Hyun (Department of Mechanical Engineering, Graduate School, Pukyong National University) ;
  • Kim, Jeong Soo (Department of Mechanical Engineering, Pukyong National University)
  • Received : 2013.10.02
  • Accepted : 2014.01.13
  • Published : 2014.02.01
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Abstract

A ground hot-firing test (HFT) was conducted to take out the optimal design configurations for the thrust chamber of 70 N-class liquid rocket engine under development. Monopropellant grade (purity: ${\geq}98.5%$) hydrazine was adopted as a propellant for the HFT, and three kinds of thrust chambers having characteristic lengths ($L^*$) of 2.79, 2.95, and 3.13 m were selected for their performance evaluation. It is revealed through the test and evaluation that the increase of the $L^*$ leads to a performance degradation in the test condition specified, and pulse response performance of the development model shows superior characteristics to commercialized hydrazine thrusters.

70 N급 액체로켓엔진 개발모델의 추력실 최적설계형상 도출을 위한 지상연소시험을 수행하였다. 단일추진제급(순도: ${\geq}98.5%$) 하이드라진이 연소시험용 추진제로 선정되었고, 특성길이($L^*$) 2.79, 2.95, 그리고 3.13 m를 갖는 추력실에 대한 성능평가가 수행되었다. 시험조건 내에서의 촉매대 $L^*$ 증가는 추력기의 성능저하를 야기하는 것이 관찰되었으며, 개발모델의 펄스응답 성능이 현재 상용화되어 있는 하이드라진 추력기와 비교하여 우수한 것이 확인되었다.

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References

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