基于热真空环境模拟试验技术的信号电缆热防护方案研究

热真空环境模拟试验是在地面上模拟飞行中施加在飞行器表面热载荷的一种方式,为了模拟"高真空"和"高热流"环境,利用石英灯阵作为热源,基于热学理论分析和计算,设计并实现了一套热真空环境模拟试验及测控系统方案。航天器电缆热量过高会造成电缆损坏,影响整星安全,利用热真空环境模拟系统设计并进行了真空环境下的信号电缆隔热材料包覆方案考核试验,对热防护方案进行了试验验证,并得出了满足温控要求的热防护方案。试验结果证明,镀铝薄膜隔热层的热防护效果较好,能够满足航天器对信号电缆的热防护需求。同时,该热真空环境模拟试验系统也为热防护方案的试验验证提供了必要的技术手段。

Research of Signal cables thermal protection scheme based on thermal vacuum environment-simulating test

The thermal vacuum environment-simulating test provides a way of simulating surface heating load of aircrafts. In order to simulate the high vacuum and high heat, a set of thermal vacuum environment-simulating controlling and detecting system is established. The quartz radiation heating system is utilized as the heating source. High heat and temperature will damage the spacecraft and may even harm the safety of the spacecraft. Therefore, the covering methods of signal cables with thermal insulating materials are evaluated based on the thermal vacuum environment-simulating test. Experimental results indicate that the aluminized film outperforms alkali-free glass fiber in cable protection, which satisfies the thermal control requirements of spacecraft. Thus, this kind of test can be employed in demonstrating the thermal protection scheme within thermal environment.