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针对某型大功率柴油机,采用试验和计算流体力学(CFD)仿真相结合的方法,研究了大功率柴油机在不同喷油提前角下的燃烧特性,着重分析了缸内最大爆发压力、峰值角、最大压力升高率、燃烧始点等参数的变化趋势,同时对缸内速度场、燃空当量比分布和温度场的变化进行研究,得出喷油提前角的变化对预混合滞燃期的改变是影响柴油机燃烧过程的主要因素,随着喷油提前角的增大,滞燃期内可燃混合气增多,缸内最大爆发压力、最大压力升高率和缸内最高温度随之升高。
Aimed at a type of high-power diesel engine, the combustion characteristics of high-power diesel engine under different fuel injection advance angles were studied by the combination of experimental and computational fluid dynamics (CFD) simulations. The maximum in-cylinder burst pressure, peak angle, The maximum pressure rise rate, the initial combustion point and other parameters of the trend, while the cylinder velocity field, combustion air equivalence ratio distribution and temperature changes in the study, come to fuel injection advance angle for the premixed combustion retardation change Is the main factor that affects the combustion process of diesel engine. With the increase of fuel injection advance angle, the combustible gas mixture increases in the retarding period, and the maximum explosion pressure, the maximum pressure rise rate and the maximum cylinder temperature increase.