载人航天器舱内气压下降时的空气强制对流换热

为了在载人航天器的热控制中评估舱内气压下降对空气强制对流换热能力的影响,分析了空气流动参数和物性参数随舱内气压的变化规律,指出了已有的经验关联式中压力和换热系数的关系,并用数值方法进行了验证。分析结果表明空气强制对流的换热能力随舱内气压的下降而下降,当气压低于3.04×104Pa后,空气强制对流对设备散热的贡献已经非常有限。

Heat Transfer of Air Forced Convection with Dropping Atmosphere Pressure in Manned Spacecraft Cabin

To estimate the capability of air forced convention heat transfer in thermal control of large manned spacecraft,the principle of air flow parameters and physical properties varying with the dropping pressure was studied.The relationship between the atmosphere pressure and the coefficient of air forced convection heat transfer in the empirical and practical relations was pressented,and a numerical example was provided to prove this relationship.The results indicate the heat transfer capability of air forced convection decreased with the atmosphere pressure in the cabin of manned spacecraft dropping,and the air forced convection contributed little to the equipment heat dissipation when the pressure was lower than 3.04×104Pa.