flowmaster进行发动机散热冷却系统的模拟分析.doc

——————————————————————————————————————————————— flowmaster进行发动机散热冷却系统的模拟分析 1 1．概述 .................................................................................................................. 3 1．1 仿真目的 .............................................................................................. 3 1．2 系统概述 .............................................................................................. 3 1．3 仿真要求 .............................................................................................. 3 2．冷却系统原理 .................................................................................................. 4 3．冷却系统模型 .................................................................................................. 6 3．1 Flowmaster建模过程 ........................................................................... 6 3．1．1 建模的原则 ............................................................................ 6 3．1．2 复杂系统的建模 .................................................................... 6 3．1．3 建模、分析过程 .................................................................... 6 3．2 理论基础 ............................................................................................ 10 3．2．1 流动阻力方程 ...................................................................... 10 3．2．2 质量守恒方程 ...................................................................... 10 3．2．3 压力损失方程 ...................................................................... 10 3．2．4 换热方程 .............................................................................. 11 3．2．5 整体求解 .............................................................................. 11 3．3 建模过程 ............................................................................................ 12 3．3．1 发动机本体的建模 .............................................................. 13 3．3．2 温度控制阀的建模 .............................................................. 17 3