喷油系统匹配对小缸径柴油机工作过程及噪声性能的影响

Influences of Matching of Fuel Injection System on Noise and Working Process in Small Bore Diesel Engine

运用试验和模拟计算分析的方法,系统地分析了N485柴油机配装两种不同喷油泵的喷油系统时,喷油系统性能、柴油机工作过程以及整机噪声的变化。研究表明,装配BQ喷油泵,喷油系统的喷油压力较高,供油速率较大和供油持续时间缩短,使得滞燃期的喷油量增加,滞燃期内形成的可燃混合气较多,预混燃烧剧烈,导致整机噪声声功率级增加。

Applying the method of experiment and simulating calculation, it was systematicaUy analyzed that the changes of fuel injection system performance,worklng process and noise performance when matching with two type fuel pumps for N485 diesel. The investigation has declared that the fuel injection with BQ fuel pump had higher injection pressure, bigger fuel supply rate and shorter fuel supply duration,which would cause the fuel injection quantity and the rule-air mixture to increase during ignition delay period, the pre-mixod combustion to become acutely, and finaUy result in increased power levels of noise.