基于Fluent计算的火箭离轨姿态运动仿真与分析

The Analysis and Simulation of Attitude Motion for a De-orbit Rocket Based on Fluent Flow Field Calculation

在航天器姿态运动分析中常遇到液体的流动、晃动及流/固耦合等问题,针对这类问题建立精确的数学模型是很困难的,通常需要利用数值计算和仿真手段进行分析。利用用户互动功能(UDF),引入自定义的变量源函数,应用Fluent对运载火箭离轨姿态控制进行剩余燃料的流场数据分析。通过在流体运动方程中加入相关的牵连运动,得到在轨运行状态下贮箱内剩余液体的运动参数和对贮箱的干扰力矩,为运载火箭系统的姿态运动分析和仿真提供运算参数,使得流场的变化与运载火箭的姿态运动相关联,分析各个时刻流场运动状态对箭体姿态的影响。

Due to the attitude motion analysis of a spacecraft, the fluxion and sloshing of liquid are frequently encountered. Since it is difficult to establish a precise mathematical model for such issues, researchers prefer to use numerical calculation and simulation for analysis. In this paper, the UDF is used to introduce the user defined variable function and the rocket de-orbit control with flow field simulation of residual fuel based on fluent is token for example to analyze. By adding transport motion to the fluid motion equa- tions, the parameters and disturbing torque of flue under the on-orbit-state can be obtained. The operation parameters of attitude analysis and simulation for launch vehicle system are provided so that the changes in flow and the attitude motion of the launch vehicle are correlated.