某型共轨柴油机排放技术研究

Research on Emission Technology of a Common Rail Diesel Engine

为使某型共轨柴油机排放限值满足非道路第三阶段排放法规,利用AVL Fire软件对柴油机缸内喷射过程和燃烧过程进行了模拟仿真计算,通过实测缸压曲线验证了模型的精度,根据仿真结果对原有喷油嘴进行了优化设计,提出了两种优化方案,研究了不同喷油嘴孔数对喷射过程、缸内温度分布、额定工况碳烟和一氧化氮的生成量以及柴油机非道路八工况排放结果的影响。试验验证了仿真结果,优化后的6孔喷油嘴在油耗更低的情况下满足了非道路第三阶段限值要求。

In order to meet the non-road third-stage emission regulations for a certain type of common rail diesel engine emission limit,the AVL Fire software was used to simulate the diesel engine in-cylinder injection process and combustion process.The accuracy of the model was verified by the measured cylinder pressure curve.The simulation results optimize the design of the original injector,and two optimization schemes are proposed.The effects of the number of nozzle holes on the injection process,the temperature distribution in the cylinder,the generation of soot and nitric oxide in the rated working conditions and the emission results of the diesel engine under the eight-way condition were studied.The test verifies the simulation results,and the optimized 6-hole injector meets the non-road thirdstage limit requirement with lower fuel consumption.