空间环境模拟器热沉液氮密闭循环方案及数值模拟  

Scheme and numerical simulation of LN2 closed loop system for shrouds in space environment simulator

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作  者:单巍巍[1] 王紫娟[1] 龚洁[1] SHAN Weiwei;WANG Zijuan;GONG Jie(Beijing Institute of Spacecraft Environment Engineering,Beijing 100094,China)

机构地区:[1]北京卫星环境工程研究所,北京100094

出  处:《航天器环境工程》2024年第5期589-594,共6页Spacecraft Environment Engineering

摘  要:空间环境模拟器中氮系统设备众多,管路复杂,通过传统理论计算设计的系统参数与实际运行结果存在一定偏差,从而导致系统流量和压力偏离预期。为准确分析和确定氮系统的关键参数,运用数值模拟软件FloMaster对某单相密闭循环氮系统进行全系统的一维仿真模拟,研究氮系统中单一设备的模型参数,从而确定影响系统运行的关键参数。将系统仿真计算结果与实际运行结果进行对比发现,液氮管道的阻力损失误差是造成系统流量和压力偏差的主要因素;同时,液氮流量的差异也会对换热过程造成影响,使热沉出口的液氮温度出现偏差。但系统偏差不影响系统的特征参数的变化趋势。综上,这种仿真方法简化了理论计算方法的计算过程,提升了设计效率,为系统设计提供了数据基础和设备选型依据。Due to the numerous components and complex pipelines of the nitrogen system in space environment simulator,there exists deviation between the system parameters designed by the conventional theoretical calculation and the actual operation results,causing flow and pressure of the system deviating from expectations.In order to accurately analyze and determine the key parameters of nitrogen system,the numerical simulation software FloMaster was used to conduct a one-dimensional simulation of a single-phase closed loop nitrogen system.The parameters of a single device model in the nitrogen system were studied to determine the key parameters that affect the operation of the system.Comparing the simulation and the actual operation results of the system,it was found that the flow resistance of liquid nitrogen(LN2)pipelines was the main factor causing the deviation of the system flow and pressure.Moreover,the variation of LN2 flow rate would also affect the heat transfer,resulting in a deviation of LN2 temperature at the outlet of the shroud.Whereas,the system deviation does not affect the trend of changes in the characteristic parameters of the system.In summary,the proposed simulation method simplifies the calculation process of theoretical calculation methods,improves design efficiency,and provides a data foundation and equipment selection basis for system design.

关 键 词:空间环境模拟器 氮系统 单相密闭循环 液氮 系统仿真 

分 类 号:V416.8[航空宇航科学与技术—航空宇航推进理论与工程]

 

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