The total number and volume concentrations at high engine speed are larger than at middle engine speed. 高转速下排气颗粒数浓度和体积浓度大于中间转速时的数浓度和体积浓度。
Maximum diameter of nuclei mode at middle engine speed gives smaller value than that at high engine speed. 中间转速下排气颗粒的核模态峰值粒径小于高转速下核模态的峰值粒径,积聚模态峰值粒径大于高转速下积聚模态的峰值粒径。
For PRF fuel with high octane number, the combustion efficiency decreased with the increase of engine speed, and the maximum ITE occurred at the middle engine speed. 对于高辛烷值燃料,转速升高燃烧效率降低,指示热效率在中间转速最高,高转速降低。
The number concentrations of nuclei mode increase with the increase of load at high engine speed, and the number concentration of nuclei mode varies little with load at middle engine speed. 中间转速下积聚模态峰值粒径随负荷增大先增大后减小,高转速下积聚模态峰值随负荷变化无明显变化。
The simple refitting mechanism construction and the constructive type are suitable for the middle and small engine manufacturing enterprises. 摘要介绍用C620车床改装成用于加工四缸发动机的凸轮轴靠模车床,其结构简单。所改装的机构和结构型式对中小型发动机厂很适用。