运载火箭低温动力系统盲管传热研究

摘要

Blind tube is used to measure the tank pressure in the cryogenic power system of the launch vehicle. To avoid the senor to be in the cryogenic environment, the temperature distribution in the blind tube needs to be analyzed to obtain the tube length and the installation position of the pressure senor. In this paper, numerical investigation on the temperature distribution of the blind tube was carried out using FLUENT. The results showed that the one-dimension result coincided with the theoretical result. The two-dimension results showed that the effect length of cryogenic area was 0. 2 m. The effect length decreased with the decrease of the thermal conduction coefficient and the tube diameter.%运载火箭低温动力系统贮箱测压采用盲管,为避免测压传感器处于低温环境,需要对盲管内的温度分布进行分析,从而得到导管长度和传感器的安装位置.采用FLUENT软件对盲管内的温度分布进行了数值模拟,一维数值计算与理论分析结果符合良好;二维数值计算结果表明:低温区域的影响范围为距管路根部0.2 m的区域;导热系数越低、管路直径越小时,低温区域的影响范围越小.