Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effects of Injector Recess and Combustion Chamber Length on Combustion Stability of Swirl Coaxial Injectors

동축 와류형 분사기의 연소안정성에 대한 분사기 리세스 및 연소실 길이의 영향

  • Bak, Sujin (School of Mechanical Engineering, Chungbuk National University) ;
  • Hwang, Donghyun (School of Mechanical Engineering, Chungbuk National University) ;
  • Ahn, Kyubok (School of Mechanical Engineering, Chungbuk National University) ;
  • Yoon, Youngbin (Department of Aerospace Engineering, Seoul National University)
  • Received : 2019.11.29
  • Accepted : 2020.01.08
  • Published : 2020.02.01
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Abstract

In this study, model combustion tests were conducted to investigate the combustion instability characteristics of swirl coaxial injectors for a liquid rocket engine. To examine the effects of the combustion chamber resonant frequency and the injector mixing conditions, pressure fluctuations in the combustion chamber were measured by changing the combustion chamber length, injector recess length, and propellant mixture ratio. From the test results, the variation in the pressure fluctuations for each experimental condition was confirmed and the combustion stability was evaluated by stability mapping. It was found that the longitudinal mode and Kelvin-Helmholtz instabilities occurred due to the change in the combustion chamber and recess lengths.

본 연구에서는 액체로켓엔진용 동축 와류형 분사기의 연소불안정 특성을 파악하기 위해 기체 추진제를 이용한 모델 연소실험을 수행하였다. 연소실 공진 주파수와 분사기 혼합조건의 영향을 알아보고자, 연소실 길이, 분사기, 리세스 길이, 추진제 혼합비를 변경하면서 연소실 압력섭동을 측정하였다. 실험 결과, 각 실험조건에 따른 압력섭동 변화를 확인하였으며 안정성 매핑을 통해 연소안정성을 평가하였다. 그리고 연소실 길이와 리세스 길이 변화에 따라 종방향 모드 및 켈빈-헬름홀츠 불안정이 발생함을 발견하였다.

Keywords

References

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