多缸柴油机转速波动与燃烧不均匀性的相关性

Correlation between Fluctuation of Speed and Combustion Nonuniformity in a Diesel Engine

测量了不同转速和负荷下V型6缸增压柴油机6个气缸内的瞬态压力和瞬时转速波动,分析了瞬时转速波动和各缸燃烧不均匀性的相关性。试验表明:多缸柴油机相邻的两缸压力峰值对应的曲轴转角之间总会出现一个转速波动峰值,并且某一缸燃气对活塞作功越大,随后出现的转速波动峰值越大,反之,转速波动峰值越小;当平均转速一定时,负荷越大,转速波动率也越大;负荷相同时,转速波动率的大小与转速没有单调变化关系。

For a V-type six-cylinder supercharged diesel engine,the transient engine speed and the pressure in each cylinder were measured under different engine speeds and loads.The correlation between the fluctuations of transient engine speed and the combustion nonuniformity of the six cylinders were analyzed.The results indicated that a wave peak of transient engine speed emerges at the point between the two peaks of cylinder pressure of two adjacent fired cylinders.And,the more the output of positive work is in one cylinder,the larger the subsequent peak value of fluctuant engine speed is.When the mean engine speed is constant,the higher the load is,the larger the fluctuation ratio of engine speed is.However,when the load is same,the fluctuation ratio is independent to the mean engine speed.