Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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Effect of Spiral Turbulent Ring on Detonation Performances of Acetylene-Oxygen Mixture

나선형 난류고리가 아세틸렌-산소 혼합기의 데토네이션파 성능에 미치는 영향

  • 손민 (한국항공대학교 대학원 항공우주 및 기계공학과) ;
  • 서찬우 (한국항공대학교 대학원 항공우주 및 기계공학과) ;
  • 이건웅 (한국항공대학교 대학원 항공우주 및 기계공학과) ;
  • 구자예 (한국항공대학교 항공우주 및 기계공학부) ;
  • Received : 2013.02.04
  • Accepted : 2013.03.15
  • Published : 2013.04.01
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Abstract

An effect of a spiral turbulent ring, so-called Shchelkin spiral, on a detonation performance was studied experimentally for acetylene and oxygen mixture. A couple of dynamic pressure transducers were used to calculate a detonation wave velocity by a time difference between two pressure peaks. In addition, impulse was measured by a load cell and the impulse was used to analyze the spiral effect on the detonation performance. A CFD analysis was adopted to calculate mass flow rates of the propellants and the minimum filling time. The maximum velocity and pressure were measured at the equivalence ratio of 2.4, and the measured values showed similar trend to C-J conditions calculated from CEA. For the shorter chamber with the short spiral, the maximum detonation velocity was appeared. In contrast, the longer chamber without the spiral showed the maximum thrust performance.

Shchelkin 나선으로 알려진 나선형 난류고리가 아세틸렌-산소 혼합기의 데토네이션파의 성능에 미치는 영향을 실험적으로 연구하였다. 고속응답 압력 트랜스듀서로 측정된 압력 피크의 시간차를 이용하여 데토네이션파 속도를 산출하였다. 또한 추력대를 이용해 데토네이션파의 강도를 측정하여 나선형 난류고리가 연소성능에 미치는 영향을 분석하였다. CFD를 이용하여 간접적으로 유량을 산출하고, 최대 충진률을 위한 최소 충진시간을 도출하였다. 아세틸렌-산소 추진제의 당량비 2.4에서 최대속도 및 압력을 나타냈으며, CEA로 계산된 C-J 속도와 유사한 값을 보였다. 짧은 연소기와 짧은 나선형 난류고리를 사용하는 경우에 최대의 데토네이션파 속도를 나타냈지만, 반대로 난류고리를 사용하지 않은 긴 연소기에서 최대 추력성능을 보였다.

Keywords

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