دانلود مقاله NUMERICAL INVESTIGATION ON THE EFFECTS OF ALTITUDE ON THERMAL CONTROL OF A SMALL SATELLITE
سال انتشار: ۱۳۸۴
محل انتشار: سیزدهمین کنفرانس سالانه مهندسی مکانیک
تعداد صفحات: ۷
Khoshnam – Satellite thermal control researcher, ITRC,Kargar ST,Tehran
Shahryari – Satellite thermal control senior researcher, ITRC,Kargar ST,Tehran
Khoddam – Associate professor, ITRC,Kargar ST,Tehran
For a given beta angle, the time of satellite remaining in eclipse depends on the orbit altitude and decreases as the altitude increases. The model includes a small communication satellite with fast spine. Only components and elements that from thermal control point of view are important have been included in the model and analysis. Geometrical and thermal mathematical models of satellite have been built by the use of Thermal
Desktop and SINDA/FLUINT soft ware.
In this paper transient heat transfer and temperature distributions respectively of a small satellite model in four different LEO (low earth orbits) orbits in with altitudes of 700, 900, 1000, 1500 kilometers respectively analyzed and presented. The effects of orbit altitude variations on absorbed orbital heating rates (earth infrared radiation, Albedo, solar radiation) by external surfaces of satellite are analyzed. The temperature
distribution of elements and surfaces are calculated. According to the results obtained, increasing the satellite altitude decreases the absorbed orbital heating rates by the satellite bottom plate so its temperature decreases. There aren’t any considerable changes in absorbed orbital heating rates for satellite top plate and as a result temperature will not change with increasing the altitude. Satellite lateral plates experiencedifferent temperature changes due to increasing the altitude (depending on beta angel). The temperature of all internal components will change accordingly.