柴油机喷油器内部流动和缸内喷雾燃烧的联合模拟

Combined Simulation of Inside Flow in Fuel Injector as Well as Spray and Combustion in Cylinder in a Diesel Engine

利用FIRE等软件,以AIAA的V&V准则为指导,对简单喷油器模型内部流动进行了校核计算,提高了Deutz1013柴油机喷油器内部穴蚀两相流动模拟的可靠性,并通过接口文件,实现了喷油器内部流动与缸内喷雾、燃烧的联合模拟,比较了柴油雾化燃烧的传统模拟方法和联合模拟方法的差异,分析了柴油的初次破碎对雾化和燃烧的影响,有利于喷油器的优化设计和柴油机燃烧的参数匹配。结果表明,AIAA的V&V准则可以大幅度提高数值模拟的精度和可靠性,而且喷油器内部产生的穴蚀对柴油的雾化和燃烧有很大影响。

Guided by the V＆V Rule of AIAA, the flow in a simple fuel injector was analyzed by using the FIRE software, which is helpful to improve the reliability of the two-phase flow cavity simulation in the fuel＇injector of Deutz1013 diesel engine. The combined simulation of the flow in the injector as well as the spray and combustion in the cylinder was realized through the interface file of the injector outlet. And the influence of initial fuel break-up on the spray and combustion was carefully studied. The results show that the precision and reliability of the simulation can be improved greatly by the V＆V Rule of AIAA, and the cavity in the injector has a great effect on the diesel spray and combustion.