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在微重力条件下,舱内的强迫通风换热占绝对优势,在地面由于重力的影响,会产生自然对流,从而形成混合对流换热.通过理论分析和数值模拟,发展了一种温度-材料-Nusselt数综合保持技术,即利用舱内的通风,通过减小尺寸降低Grashof数,提高速度保持Reynolds数,使Gr/Re~2小于某一值,从而达到抑制自然对流、消除或减小重力影响的目的,从而能保持原型和模型的Nusselt数不变、流场和温度场的相似.利用数值计算的方法,对这一技术进行了验证.
Under the condition of microgravity, forced ventilation and heat exchange in the cabin occupy an absolute superiority, resulting in natural convection on the ground due to the influence of gravity, resulting in the formation of mixed convective heat transfer. By theoretical analysis and numerical simulation, a temperature- - Nusselt number of integrated maintenance technology, that is, the use of cabin ventilation, reduce the number of Grashof by reducing the size, increase the speed to maintain the Reynolds number, so that Gr / Re ~ 2 is less than a certain value, so as to inhibit the natural convection, eliminate or reduce gravity So as to keep the Nusselt number of the prototype and the model unchanged and the similarity between the flow field and the temperature field.This technique is validated by the numerical method.