Journal of the Korean Society for Aeronautical & Space Sciences (한국항공우주학회지)

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Effect of ambient gas density and injection velocity on the atomization characteristics of impinging jet

주위 기체밀도와 분사속도에 따른 충돌제트의 미립화 특성

  • 임병직 (서울대학교 기계항공공학부) ;
  • 정기훈 (서울대학교 기계항공공학부) ;
  • 길태옥 (서울대학교 기계항공공학부) ;
  • 윤영빈 (서울대학교 기계항공공학부)
  • Published : 2004.08.01
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Abstract

On this paper study is concentrated on the breakup and atomization characteristics of spray formed by impinging jet injectors(like-doublet) used in liquid rocket engine(LRE). On the process of breakup and atomization, injection velocity and ambient gas pressure are the main parameters, so that these are used as variables that specify the experimental condition. Injection velocity varied from 3m/s to 30m/s and ambient gas pressure changed from 0.1MPa to 4.0MPa with nitrogen gas. As results, measured physical quantities decreased with increasing injection velocity and ambient gas pressure. But the decreasing ratios are different from those of the theory.

본 논문에서는 액체로켓 엔진에 많이 사용된 충돌형 분사기의 미립화 특성에 대해 연구하였다. 분사속도와 주위 기체압력은 분열과 미립화 과정에 결정적인 영향을 주는 변수로서 $3m/s{\sim}30m/s,\;0.1Mpa{\sim}4.0MPa$로 변화시키면서 실험을 수행하였다. 전체적으로 분사속도와 기체압력의 증가에 따라 측정된 분열길이, 분열파장, 액적크기 등이 감소하였다. 하지만 그 감소율은 이론에서 예측된 것과는 다른 값을 나타내었다.

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References

  1. Squire, H.B., "Investigation of the instability of a moving liquid film", British journal. of applied physics, Vol.4, 1953, pp.167-169. https://doi.org/10.1088/0508-3443/4/6/302
  2. Dombrowski, N., and Hooper, P.C, "The effect of ambient density on drop formation in sprays", Chemical and engineering science, Vol.17, 1962, pp.291-305. https://doi.org/10.1016/0009-2509(62)85008-8
  3. Heidmann, M.F., Priem, R.J., and Humphrey, J.C., "A study of sprays formed by two impinging jets", NASA TN 3835, 1957.
  4. Ryan, H.M., Anderson, W.E., Pal, S., and Santoro, R.J., "Atomization characteristics of impinging liquid jets", Journal of propulsion and power, Vol.11, 1995, pp.135-145. https://doi.org/10.2514/3.23851
  5. Anderson, W.E., Ryan, H.M., and Santoro, R.J., "A Model for impinging jet atomizer", 32nd JANNAF, 1995, pp.55-64.
  6. Huang, J.C.P., "The breakup of axisymmetric liquid sheets,journal of fluid mechanics", Vol.43, Pt.2, 1970, pp.305-319. https://doi.org/10.1017/S0022112070002392
  7. Taylor, G.I ., "The dynamics of thin sheets of fluid II. Waves on fluid sheets", Proceedings of the royal society of London, A, Vol.253, 1959, pp.296-312. https://doi.org/10.1098/rspa.1959.0195
  8. lbrahim, E.A., and Przekwas, A.J., "Impinging jets atomization, Physics of fluids" Vol.3, No.12, 1991, pp.2981-2987. https://doi.org/10.1063/1.857840
  9. Strakey, P.A., and Talley, D.G., "Spray characteristics of impinging jet injectors at high back-pressure", 8th ICLASS, 2000.