空间对接综合试验台温度环境模拟系统及其温场特性

Experimental Study on the Thermal Characteristic for the Cavity of a Novel Space Environment Simulator

利用液氮喷射散流装置与可控硅控制的电加热器组合来提供高低温环境,采用高精度快速反应电气动调节装置和利用旁通分流方法维持试验空间的稳定压力,以消除对接试验过程中附加压力的影响,建立了一种新型对接机构综合试验台大空间环境模拟系统,并分析了其温场特性以及系统等影响因素.结果表明,所建立的对接机构综合试验台环境模拟分系统能够满足对接试验过程对温度均匀性和升降温速率可控性的要求,高温和低温过程的温度均匀性均能维持在±3°C,通过控制送、回风温差可有效控制温变速率.

A novel space environment simulator （SES） system was set up which consists of closed-loop fluid handling system, low and high temperature air generator system, irregular shaped cavity system, and control and data acquisition system. This experimental system can provide high and low temperature test environments by spraying liquid N2 and electric heating, the pressure in the cavity can be controlled with high precision pressure adjusting system. The thermal characteristics of the SES were investigated experimentally. The experimental results show that the SES system can provide high temperature uniformity and appropriate temperature variation rate, the temperature distributions of both high and low experiment conditions are within 4-3 ℃ range. The temperature variation rate can be easily controlled by changing the differences between inlet gas temperature and recycle gas temperature, but the temperature uniformity inside cavity and temperature variation rate must be considered synthetically.