【作者】 李杰；

【导师】 宋保银；

【作者基本信息】 南京航空航天大学 ， 人机与环境工程， 2017， 硕士

【摘要】 本文的主要目的是建立人体与舱外航天服液冷通风系统的三维传热传质模型,为进一步研究舱外航天服性能打下基础。采用CATIA软件建立整体的计算模型,再用ICEM划分模型网格,最后用Fluent进行具体工况下的数值模拟。选取人体代谢率300W,通风气体流量150L/min,冷却液流量100kg/h的情况下,改变与液冷通风服的各项参数,讨论人体皮肤、通风气体、冷却液体的温度与换热量的变化规律。在舱外航天服的液冷通风系统中,通风气体在带走人体代谢热中起到了不可忽视的作用。人体将大量热量直接传递给通风气体,而后通风气体再将这些热量传递给冷却液。虽然冷却液才是带走热量的主要介质,但通风气体是重要的桥梁。舱外航天服的漏热量对液冷通风系统影响较大,其对漏出热量更加敏感。冷却管道分布密集、人体代谢量大的区域对漏热的抵抗能力较强。通风气体中含湿量的影响不能被忽略,不考虑湿度会使人体温度计算结果偏高。适当的增加液冷管道内径和导热系数,可以有效提高冷却液换热效率,降低人体皮肤温度。减小液冷管道壁厚、增加冷却液管道与人体的接触面积的方法并不能有效的增强冷却液的换热能力,并且人体皮肤温度变化受液冷管道分布的影响较大。基础服装导热系数的增加,可以急剧的降低人体皮肤温度,但其对冷却液换热能力的影响受管道分布等因素的影响,并且其可调控范围小。本文的研究结果可为舱外活动航天服及其生命保障系统的研发提供依据和参考。更多还原

【Abstract】 The main purpose of this thesis is to establish a three-dimensional model of heat and mass transfer of human body and the spacesuit cooling ventilation system,which will set foundation for investigating the performance of the spacesuit for extra-vehicular activity(EVA).The CATIA software was used to establish the overall calculation model,the ICEM to draw the meshes,and the Fluent to conduct the numerical simulation under the specific conditions.On the conditions of the metabolic rate of 300 W,the ventilation air flow rate of 150L/min and coolant flow of 100kg/h,the variations of heat transfer rate,and temperatures of human skin,ventilation gas,cooling liquid were computed and analyzed by changing the parameters of liquid-cooled ventilation garments(LCVG).In the liquid cooling and ventilation system of the extravehicular spacesuit,ventilation gas plays an important role in absorbing the metabolic heat of human body.A large amount of body heat is transferred to ventilation air first,then to the liquid coolant.Although the cooling fluid is the main media to take the heat away,the ventilation air is an important bridge.The heat flux across the spacesuit shell has a great influence on the performance of the liquid cooling and ventilation system,which is more sensitive to heat leakage.The influence of moisture content can not be ignored,for that without taking into account the humidity,the calculation result will be somewhat higher.To improve the effectiveness of LCVG,appropriate increases in cooling pipe diameter and thermal conductivity should be adopted.The effect of contact area of coolant pipes and human body on the LCVG is obviously different in different segments.The thermal conductivity of basic clothing markedly affects human body temperature,which can be regulated in a small range.The results can be a reference in the development of EVA spacesuit and its life support system.更多还原