Journal of the Korean Society of Propulsion Engineers (한국추진공학회지)

The Korean Society of Propulsion Engineers (한국추진공학회)
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An Experimental Study on Characteristics of Small-scale PDE under Low-frequency Operating Conditions

소형 펄스 데토네이션 엔진 저주파수 작동 특성 실험연구

  • Han, Hyung-Seok (Department of Aerospace Engineering, Pusan National University) ;
  • Kim, Jung-Min (Department of Aerospace Engineering, Pusan National University) ;
  • Oh, Sejong (Department of Aerospace Engineering, Pusan National University) ;
  • Choi, Jeong-Yeol (Department of Aerospace Engineering, Pusan National University)
  • Received : 2018.01.03
  • Accepted : 2018.03.17
  • Published : 2018.06.01
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Abstract

In this study, the operating characteristics of a small-scale pulse detonation engine (PDE) were investigated experimentally for application as a small thruster and an igniter. The PDE was constructed using commercial gas tubes with an inner diameter of 4.22 mm. The operating and detonation propagation characteristics of the PDE were investigated over the ranges of equivalence ratios and operating frequencies. Measured detonation speed was close to 10% of the theoretical CJ values at 1 Hz and 5 Hz conditions. However, unstable propagation characteristics were shown at 20 Hz and lean conditions, where the velocity deficit was increased by 20~62%.

본 연구에서는 소형 추력기 및 점화기로 활용 가능한 소형 PDE의 작동특성을 실험적으로 알아보았다. 4.22 mm의 내경을 갖는 상용 가스 튜브를 이용하여 소형 PDE를 구성하였으며, 당량비 및 작동 주파수 변화에 따른 PDE의 작동 및 데토네이션 전파 특성을 알아보았다. 측정된 데토네이션 속도는 1 Hz와 5 Hz 작동 조건에서는 희박 영역을 제외한 당량비 조건에 이론값과 10%이내의 오차를 가지는 비교적 정확한 값을 보였다. 그러나 20 Hz 조건의 희박 영역에서는 불안정한 전파 특성을 보였으며, 20~62%의 큰 속도 결손이 발생하였다.

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References

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