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在推进剂燃烧的建模上,传统的热力计算方法一般基于总焓守恒求解定压绝热燃烧温度和平衡组分,不能考虑壁面传热;在燃气流动的建模上,通常采用的冻结流模型认为本地的组分及热物理性质与燃烧室瞬时一致,忽略了这些参数因来流气体与本网格滞留气体掺混带来的随时间的缓变效应。提出了一种新颖的可以考虑壁面传热的基于总能量守恒的化学平衡流计算方法,运用Fortran2008语言,采用面向对象编程方法建立了化学平衡流燃气发生器管道的模块化仿真模型,并将该模型应用到一个包含42个组件的涡轮试验台气路系统的建模与仿真中。与早期模型仿真结果及试验数据的对比发现,新模型的仿真结果有一定改进,更加接近试验数据。
In the modeling of propellant combustion, the conventional thermodynamic calculation method generally solves the constant pressure adiabatic combustion temperature and equilibrium composition based on the total enthalpy and can not consider the wall heat transfer. In the modeling of gas flow, the commonly used frozen flow model It is considered that local composition and thermophysical properties are instantaneously consistent with the combustion chamber, neglecting the gradual effect of these parameters over time due to the mixing of the flowing gas with the retained gas in the grid. A novel chemical equilibrium flow calculation method based on total energy conservation considering wall heat transfer was proposed. Fortran2008 language was used to establish a modular simulation model of chemical equilibrium flow gas generator pipelines using object-oriented programming method. The model was applied to the modeling and simulation of a 42-component turbo-testbed pneumatic system. Compared with the results of the earlier model and the experimental data, it is found that the simulation results of the new model have some improvements and are closer to the experimental data.