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

  • 제33권4호
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  • Pages.57-62
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  • 2005
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  • 1225-1348(pISSN)
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  • 2287-6871(eISSN)
한국항공우주학회 (The Korean Society for Aeronautical and Space Sciences)
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Modified View Factor를 이용한 인공위성 분자오염 역류확률 예측법

An efficient method using the modified view factor for estimating the molecular backscattering probability in the space conditions

  • 발행 : 2005.04.01
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초록

인공위성의 outgassing 분자에 대한 역류오염 해석에는 BGK 또는 DSMC 등의 방법이 사용되어 왔으나, 이들은 해석이 복잡하고 시간이 오래 걸리는 등의 비효율성이 문제이다. 본 논문에서는 분자들의 충돌간 평균자유행로가 위성체의 크기에 비해 매우 길고, 동시에 위성체의 속도가 분자들의 열속도보다 매우 크다는 점을 이용하여, 간단한 근사모델을 도입함으로써 일반적인 view factor 법과 비슷한 편리성과 간편성을 가지면서 DSMC법과 정확하게 일치하는 결과를 주는 modified view factor 법을 개발, 제안한다.

Satellite contamination from back-scattered molecules has long been analyzed using the BGK theory or the DSMC technique which are rather inefficient in that they are complicated or take a long time in the analysis. This study presents a new technique of estimating the back-scattering contamination, which is very simple and easy to use like the view factor method and also very accurate. This method, called the modified view factor method, is equivalent to the DSMC in so far as the molecular thermal velocity is much smaller than the satellite velocity and the mean free path much longer than the satellite.

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참고문헌

  1. Alan C.Tribble, 'The Space Environment implications for Spacecraft Design', Princeton University Press, Princeton New Jersey(1995)
  2. S. J. Robertson, 'Bhatnagar-Cross-Krook Model Solution of Backscattering of Outgass Flow From Spherical Spacecraft', Progress in Astronautics and Astronautics, Vol.51, Pt.1, AIAA, New York, pp.479-489, 1977
  3. S. J. Robertson, 'Spacecraft Self-Contamination due to Backscattering of Outgass Product', LMSC-HREC TR D496676, Jan. 1976
  4. Charles R. Justiz, 'DSMC- and BGK-Based Calculations for Return Flux Contamination of an Outgassing Spacecraft', J. THERMOPHYSICS. Vol.8, NO.4: TECHNICAL NOTES, pp.802-803 https://doi.org/10.2514/3.617
  5. H. K. Alan Kan, 'Desorptive Transfer: A Mechanism of Contaminant Transfer in Spacecraft', J.SPACECRAFT, 12, no.1, p.62(1975)
  6. G.A.Bird, 'Molecular Gas Dynamics and the Direct Simulation of Gas Flows', Oxford University Press, New York(1994)