单相流体回路地面试验研究

Test Investigation of Single-phase Fluid Loop

为了对流体回路系统设计参数确定提供指导,通过地面试验方法,研究了低温和外界环境变化时单相流体回路的阻力特性、工质补偿、控温算法等。介绍了地面试验系统的组成、试验方法和相关试验结果,并重点对外界环境突变时的控温结果、控温目标点与控温装置作用点分离时的控温震荡以及低温下补偿器的补偿能力测试结果进行了分析。试验结果表明,在外界环境剧烈变化时会出现温度过冲,过冲可达到10 oC;此外,由于控温点和控温装置作用点的分离引起的相位差,会导致系统控温失败。这些结果对载人航天器流体回路的泵、换热器设计以及工作状态分析具有一定的参考作用。

In order to offer guidance to parameter decision in fluid loop design,the resistance,fluid supply and control strategy of a single-phase fluid loop are investigated experimentally at low temperature and varied environment.Build-up of test bed as well as test method and result is presented in this paper.The emphasis is to simulate the temperature overshoot due to variation of spacecraft attitude and temperature osillation because of the distance between temperature sensor and actuator as well as the supply of working fluid at low temperature. The test results show that temperature overshoot can reach 10℃ while environment varies dramatically.Also,a failure of temperature control would occur once set-point is far away from the three-way valve point.The results can provide guidance to design of pump and heat exchanger,and performance analysis of fluid loop.