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为分析航空发动管路系统流动与换热特性,研究管路流动与内部结构间的热流耦合问题,利用MATLAB/Simulink建模仿真工具包,开发了航空发动机管路系统通用仿真模块库,构建了管路系统特性分析平台。基于该仿真平台,建立了航空发动机管路系统流动计算模型和热流耦合计算模型。输入边界条件后运行仿真,得到了管路系统流体的压力、温度和流量,以及内部结构各节点的温度。计算结果与商业软件Flowmaster的计算值非常接近,并且流量、压力的仿真结果与试验值的相对误差保持在6.5%以下。利用该仿真平台能搭建较高精度的系统网络模型,提高系统建模效率,可应用于发动机管路系统的设计、改进等方面。
In order to analyze the flow and heat transfer characteristics of aero-engine piping system and to study the thermal-fluid coupling between the pipeline flow and the internal structure, a universal simulation module library for the aero-engine piping system was developed by using MATLAB / Simulink modeling and simulation toolkit. Pipeline system characteristics analysis platform. Based on this simulation platform, a flow calculation model and a heat-flow coupling calculation model for aeroengine piping system are established. After entering the boundary conditions, the simulation is run and the pressure, temperature and flow of the fluid in the pipeline system are obtained, and the temperature of each node in the internal structure is obtained. The calculated result is very close to the calculated value of the commercial software Flowmaster, and the relative error between the simulation result of the flow rate and the pressure and the experimental value remains below 6.5%. The simulation platform can be used to build a high-precision system network model and improve the system modeling efficiency, which can be applied to the design and improvement of the engine piping system.