空间站核心舱俯仰机组热设计及在轨验证

Thermal Design and Flight Verification of Pitching Unit in Core Cabin of Space Station

关键词:  空间站  核心舱  俯仰机组  热设计  验证

Key words:  Space station  Core cabin  Pitching unit  Thermal design  Verification

摘要:

为验证核心舱俯仰机组热控设计能满足空间站任务期间任何工况对机组温度的要求，运用I-DEAS/TMG软件，通过仿真分析确定了核心舱俯仰机组所需的加热功率及被动热控措施，预示了极端高温工况下的最高温度。在轨飞行情况表明：（1）俯仰机组飞行温度验证了理论计算的正确性，二者之间的偏差约3.2%，为后续在轨任务的圆满完成提供了保障。（2）喷管受太阳照射面积越大，头部及电磁阀温度越高。在太阳角为60°时，喷管受照面积最大。（3）低温工况下，有推进剂流道的机组头部和电磁阀温度高于8℃，满足高于0℃的指标要求。（4）惯性飞行姿态对俯仰机组而言，属于高温工况。跟以往飞船系列俯仰机组的被动热控设计不同，核心舱俯仰机组被动热控设计保证了电磁阀温度低于40℃，为电磁阀在合适的温度范围内可靠工作提供了保障。

Abstract:

In order to verify that the thermal control design of the pitching unit in the core cabin can meet the requirements of the temperature under any working condition during the mission of the space station， I-DEAS/TMG software is used to determine the heating power and passive thermal control measures required by the pitching unit， and the maximum temperature under extreme high temperature conditions is predicted. The on-orbit flight shows that： （1） The flight temperature of the pitching unit verifies the correctness of the theoretical calculation， and the deviation between them is about 3.2%，which provides a guarantee for the successful completion of follow-up on orbit tasks. （2） The larger the area of nozzles exposed to the sun， the higher the temperature of the heads and solenoid valves. When the solar angle is 60°， the illuminated area of the nozzle is the largest. （3） Under low temperature conditions， the temperature of unit head with propellant flow and solenoid valve is higher than 8℃，which meets the index requirement higher than 0℃. （4） The inertial flight attitude belongs to high temperature condition for the pitching unit of the core cabin. Different from the passive thermal control design of the previous spacecraft series pitching units， the passive thermal control design of the pitching unit in the core cabin ensures that the temperature of the solenoid valve is lower than 40℃， which provides guarantee for the reliable operation of the solenoid valve within the appropriate temperature range.