低温推进剂供应管道系统充填过程的动力学模型

研究了低温推进剂液体火箭发动机供应管道系统充填过程的建模问题。低温推进剂的充填相变过程采用均相模型,对推进剂充填管道系统进行有限元分割,应用基本守恒定律于充满推进剂的单元和充满气体的单元,两相单元采用等效流容方程,建立了低温推进剂管道充填过程的有限元状态变量模型。充填的容腔视为两相单元,建立了其动力学模型。利用本文的模型,对液氢、液氧推进剂的管道充填过程进行了仿真计算,给出了有关计算结果。

Dynamic Model of Priming Processes of Cryogenic Propellant Feed Lines

The priming process of feed lines of cryogenic propellant liquid rocket engines was studied. The two-phase flow of cryogenic propellant priming process was treated homogeneously as pseudo-fluid with average properties. A feed pipe was divided into uniform finite elements. By applying the basic conservation laws to the elements filled with propellant or purge gas, and employing the equivalent flow-capacitance equation to deal with the two-phase element, the finite element state-variable model for the priming process of the cryogenic propellant feed pipe was developed. By treating vessel as two-phase element, we also obtained the equations of its priming process. Using our models, the processes of LH₂ and LOX priming a pipe were calculated respectively. The calculation results are given.