Ground Based Experimental Research And Numerical Analysis Of The Flow Field In Man-Made Satellite Cabins

How to simulate by experiment the flow and heat transfer under microgravity on the ground is very important, which has not been completely solved so far. The objective of this thesis is to study the problems about ground modeling experiments on the convection heat transfer in the hermetic cabins of two man-made satellites under microgravity, and build up a set of experimental system for the ground modeling - cool experiment - based on the theoretical analysis of the effects of gravity on the flow and heat transfer in the hermetic cabins. In this thesis, a series of experiments are carried out to study the flow field in the hermetic cabins and also a mathematical modeling was built to simulate the flow of the cabins using the CFD softwareæ¡­LUENT. That the convection on the ground include forced convection and free convection. If the air flows in low velocity and the physical qualities are invariable, then a conclusion can be made that a cool experiment is logical to simulate the flow field in a cabin under microgravity. The feasibility of the cool experiment is also demonstrated. Based on this theory, some experiments were done on two different hermetic cabins of two different man-made satellites. The results of the experiments give us the distribution of velocity. Compare the results to the requested, and some suggestions can be given.But how the distributions of the velocity in the cabin is not known for the restriction of the conditions, and to solve this problem a numerical analyses of gas flow in one of the cabins under microgravity environment are carried out. The mathematical model that is developed for this analysis is formulated for FLUENT computer program. The predicted distributions of velocities are in good agreement with experiment values, from which right results can be concluded. The results give the flow status directly.