摘要
为获取超高压喷射条件下发动机性能随生物柴油掺混比例的影响规律,建立了生物柴油发动机燃烧室模型,在验证模型正确性的前提下,分析了发动机性能随生物柴油掺混比例的变化情况。结果表明:通过调整增压装置电磁阀的开启和关闭,能够实现超高压和基压喷射,压力大小则由增压装置内部的增压活塞前后两端的面积比决定;在超高压喷射条件下,存在一个最佳的生物柴油掺混比例(10%),使发动机的动力性能和经济性能同时最优;随着生物柴油掺混比例的增大,发动机的最高缸压、最高温度以及NO排放质量分数均依次降低,但最大爆发压力所对应的曲轴转角基本都处于732°CA附近。
In order to obtain the influence of biodiesel blending ratio on engine performance under ultra-high pressure injection conditions,a combustion chamber model of biodiesel engine was estab-lished.After verifying the correctness of the model,the variation of engine performance with biodiesel blending ratio was analyzed.The results show that controlling the opening and closing of the solenoid valve of boosting device can achieve ultra-high pressure and base pressure injection,and the pressure magnitude is determined by the area ratio of the front and rear ends of the boosting piston inside the boosting device.Under ultra-high pressure injection conditions,there exists an optimal biodiesel blending ratio(10%)that optimizes both engine's power performance and economic performance.Meanwhile,as the biodiesel blending ratio increases,the maximum cylinder pressure,maximum tem-perature,and NO emission mass fraction of the engine all decrease sequentially,but the crankshaft angle corresponding to the maximum burst pressure is basically around 732°CA.
作者
周磊
陈军
张萍
聂涛
郑先全
ZHOU Lei;CHEN Jun;ZHANG Ping;NIE Tao;ZHENG Xianquan(Naval Univ.of Engineering,Wuhan 430033,China)
出处
《海军工程大学学报》
北大核心
2025年第4期45-51,共7页
Journal of Naval University of Engineering
基金
湖北省自然科学基金资助项目(2024282010)
海军工程大学自主立项基金资助项目(2023502070)。
关键词
超高压喷射
生物柴油掺混比例
发动机性能
ultra high pressure injection
biodiesel blending ratio
engine performance
