【摘要】 在双区喷雾卷吸模型的基础上,建立了一个基于皱折火焰面分形理论的双燃料发动机准维模型,来描述双燃料发动机气缸内的湍流燃烧、火焰传播速度等燃烧现象以及排放性能,其中包括滞燃期子模型、喷雾卷吸子模型、燃烧和火焰传播子模型。利用该模型,对一台生物制气-柴油双燃料发动机燃烧过程进行了模拟计算,预测双燃料发动机的NOx排放特性。预测计算结果与实测值的相对误差小于5%。供油提前角提前,生物制气-柴油双燃料发动机NOx排放量增加;相同工况下引燃柴油量减小时,NOx排放量减小。更多还原

【Abstract】 A quasi-dimensional combustion model for a dual-fuel engine was developed based on a double-zone fuel spray entrainment model,which uses fractal theory to describe the geometry of flamelets in turbulent combustion and its propagation as well as its emission performance.The double-zone fuel spray entrainment model is consisted of ignition delay model,fuel spray and air entrainment model,and flame propagation model.Subsequently,the simulation for combustion processes in a biogas diesel dual-fuel engine was conducted on to forecast its NOx emission characteristics.The relative error between the simulated results and experimental data is no more than 5%.The NOx emission of the biogas diesel dual-fuel engine increases with the increase of pilot fuel quantity and the advancement of fuel delivery advance angle.更多还原