Study on Temperature Characteristics of Kerosene Propellant in Carrier Rocket Tanks before Launch

The variation characteristics of kerosene propellant temperature in the tank before launch was studied to control the temperature of rocket kerosene. And the goals making full use of the carrying capacity of the rocket and reducing the risk of propellant unloading with delayed launch can be finally achieved. Based on thermodynamic law, a parking temperature model of kerosene in tanks was established, and an identification algorithm of the model coefficient was designed. The temperature variation coefficient was identified and the prediction accuracy of the model was evaluated with pre-launch monitoring data of a rocket. Furthermore, the long-term temperature variation characteristics of kerosene in tanks were analyzed. The results showed that the prediction accuracy and precision of the kerosene temperature model in 7.5 h is better than 1 ℃. Reducing the kerosene temperature at the end of filling has no significant effect on controlling the temperature of kerosene in tanks. The effective means is to equip the rocket body with insulation layers to reduce the temperature variation coefficient.