Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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An effect of design parameters of water injection silencer on the characteristics of noise generated by Liquid Rocket Engine

물분사형 소음기의 설계 변수가 액체로켓엔 소음특성에 미치는 영향

  • Park, Hee-Ho (Chung-Nam National University, Dept. of Mechanical Engineering) ;
  • Cho, Byoung-Sun (Chung-Nam National University, Dept. of Mechanical Engineering) ;
  • Kim, Yoo (Chung-Nam National University, Dept. of Mechanical Engineering) ;
  • Ji, Pyung-Sam (Korea Electric Power Research Institute) ;
  • Kim, Seon-Jin (Korea Aerospace Research Institute)
  • Published : 1998.08.01
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Abstract

To reduce the supersonic jet noise from the liquid rocket engine, water injetion silencers were designed and tested. Test variables were the mass flow rate of water jet, the length of primary pipe and the diameter of expansion pipe. Followings are the results of this study. 1. From the same mass flow rate of water, longer primary pipe was more effective to reduce the noise. 2. Noise level was significantly reduced with increasingly water flow rate. 3. The optimum water flow rate was 10～12 times of the propellant flow rate. 4. By installing expansion pipe, noise level was reduced approximately 30㏈ compared to without expansion pipe

액체로켓엔진에서 발생하는 초음속 제트 소음을 감소시킬 수 있는 물 분사형 소음기를 설계, 제작하여 물의 질량 유동률, 1차관 길이, 그리고 2차 확장관의 지름과 같은 기하학적 변화에 따른 성능 시험을 수행하였으며, 다음과 같은 결과를 얻을 수 있었다. 1. 동일한 물의 질량 유동률에서, 1차관의 길이가 길수록 효과이었다. 2. 물이 질량 유동률이 증가하면, 소음은 감소한다. 3. 최적의 물 질량 유동률은 추진제 공급량의 10∼12배 정도이다. 4. 소음기에 2차 확장관을 부착할 경우, 약 30㏈ 정도 소음감소 효과를 얻을 수 있다.

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