耦合CFD和详细化学动力学的CNG发动机工作过程多维数值模拟

Multi-dimensional Numerical Simulation of Operating Process of CNG Engine Using Detailed Chemical Kinetics with CFD

通过结合计算流体动力学(Computational fluid dynamics,CFD)软件KIVA3V和化学动力学软件CHEMKINII,实现了耦合CFD和详细化学动力学的发动机工作过程多维数值模拟。在此基础上,对KIVA3V/CHEMKINII源程序进行了并行功能的开发,使其能在基于LINUX操作系统的大型并行计算机上运行。为了更为精确地模拟缸内的燃烧过程和监测中间组分的反应历程,耦合计算同时考虑了流动、传热及化学反应的影响,并引入了一种平衡湍流及化学动力学效应的燃烧模型。模型以天然气发动机WT615为研究对象,并对模拟结果和试验数据进行了对比。结果表明,模拟结果与试验数据有良好的一致性,模拟提供了中间组分的缸内分布信息,计算具有较高的并行效率和加速比特性。

Numerical simulation of engine combustion using CFD and detailed chemical kinetics is accomplished by integrating CFD code KIVA3V with chemical kinetics code CHEMKINII. To reduce the computation time, the coupled software is reprogrammed to have the function of parallel computing and the revised software is calculated in a massively parallel processor. In order to have a better prediction of in-cylinder combustion and intermediate involving process, the coupled simulation takes the effects of turbulence, th...