한국추진공학회지 (Journal of the Korean Society of Propulsion Engineers)

  • 제17권6호
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  • Pages.59-66
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  • 2013
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  • 1226-6027(pISSN)
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  • 2288-4548(eISSN)
한국추진공학회 (The Korean Society of Propulsion Engineers)
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밀도구배강도를 이용한 초임계 전단동축 제트 분석

Analysis of Supercritical Shear Coaxial Jet Using Density Gradient Magnitude

  • Lee, Keonwoong (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Kim, Dohun (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Son, Min (Department of Aerospace and Mechanical Engineering, Korea Aerospace University) ;
  • Han, Choyoung (Satellite Technology Research Laboratory, Korea Aerospace Research Institute) ;
  • Koo, Jaye (School of Aerospace and Mechanical Engineering, Korea Aerospace University)
  • 투고 : 2013.06.21
  • 심사 : 2013.11.15
  • 발행 : 2013.12.01
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초록

액체질소와 기체아르곤을 이용해 단일 제트와 동축 제트의 아임계 및 초임계 분무 특성을 관찰하였다. 분무의 가시화에는 shadowgraph 기법이 사용되었으며, 실험결과 분석을 위해 밀도구배강도 이미지가 사용되었다. 아임계 조건에서는 단일제트에 비해 동축제트가 제트 계면의 굴곡이 더 심해짐을 알 수 있었다. 초임계 조건에서는 동축제트의 초임계 질소가 단일제트에 비해 빠르게 확산되는 것을 확인하였다. 평균 이미지에서 제트 축방향 거리에 따른 제트 직경을 도출하였으며 초임계 조건에서는 동축 분무의 제트 직경이 더 빠르게 감소하였다.

Spray characteristics of single round jet with liquid nitrogen and coaxial spray with liquid nitrogen and gaseous argon were observed. Shadowgraph method was used for spray visualization, and density gradient magnitude image was used to analyse the result. In subcritical condition, irregularity of the jet surface was harder in the coaxial spray. In supercritical condition, diffusion of nitrogen injected from shear coaxial injector was faster than single jet. Jet diameter was induced by averaging images, in supercritical condition, difference of diameter of coaxial jet was rapidly decreased than that of single jet.

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참고문헌

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