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

The Korean Society for Aeronautical and Space Sciences (한국항공우주학회)
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Lumped System Analysis on the Lunar Surface Temperature Using the Bottom Conductive Heat Flux Model

달 표면온도 예측을 위한 집중계 해석방법과 하부 열유속 모델의 적용

  • Kim, Taig Young (Department of Mechanical Engineering, Korea Polytechnic University)
  • Received : 2018.10.11
  • Accepted : 2018.11.21
  • Published : 2019.01.01
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Abstract

Instead of securing thermophysical properties throughout the entire lunar surface, a theoretical method to predict the lunar surface temperature accurately using improved Lumped System Model (LSM) was developed. Based on the recently published research, thermal mass per unit area at the top regolith layer is assumed uniform. The function of bottom conductive heat flux was introduced under the theoretical background. The LSM temperature prediction agrees well with the DLRE measurement except for dusk, dawn and high latitude region where the solar irradiation is weak. The relative large temperature discrepancy in such region is caused by the limit of the bottom conductive heat flux model. The surface temperature map of the moon generated by the LSM method is similar to the DLRE measurement except for the anomalous temperature zones where surface topography and thermophysical properties appear in highly uneven.

달 표면 전체에 걸쳐 열물성치를 확보하는 대신 단위 면적당 열질량을 이용하여 달 표면온도를 정확히 예측할 수 있는 개선된 집중계(Lumped System Model, LSM) 해석방법을 제시하였다. 최근에 발표된 연구에 기초하여 표토층 최상단의 단위 면적당 열 질량이 균일하다고 가정하고, 하부면 전도열유속 방정식을 이론적인 근거 하에 도입함으로써 DLRE 측정온도와 상당한 정도 잘 일치하는 달 표면의 온도지도를 구하였다. LSM 온도예측은 태양복사가 약한 황혼, 새벽 및 고위도 지역을 제외하면 DLRE 측정과 잘 일치하며, 이러한 지역에서의 온도 불일치는 하부 전도열유속 모델의 한계에 기인한다. 표면 지형과 열물성치가 매우 불균일한 지역에서 나타나는 비정상온도 영역을 제외하고 LSM 분석으로 생성된 달 표면 온도지도는 DLRE 측정 결과와 유사하다.

Keywords

References

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