摘要
二冲程对置活塞转盘(2S-OPCP)发动机是一种新型发动机.该发动机使用凸轮转盘机构替代了传统发动机中的曲柄连杆机构,这种特殊的结构使转盘发动机具有功率密度高、体积小和结构简单等优点.发动机两侧的凸轮转盘存在相对转角,通过改变凸轮相对转角θ可以改变发动机的有效压缩比及换气正时,从而影响发动机的性能.根据转盘发动机的结构特点及工作过程搭建了一维热力学仿真模型,并使用试验数据对模型的缸内压力曲线进行了标定.随着θ改变,发动机的扫气过程及性能表现都会发生变化.当θ在0°~10°内变化时,发动机的换气过程有所改善,给气比在θ=7°时最高,提升了3.5%.同时,在θ达到4°后,指示燃油消耗率(ISFC)开始逐渐增加,ISFC最高增加了3.5%(θ=10°);而平均有效压力(IMEP)最高增加了3.3%(θ=4°),之后随着θ的上升,IMEP开始降低.
A novel 2-stroke opposed piston cam-plate(2S-OPCP)engine was proposed.The opposed pistons are driven by two dynamic cam plates,instead of crank mechanism,which contributes to various advantages such as higher power density,smaller size and less complicated structure.There is a phase difference between these two cam plates,which is called cam relative angleθ.Piston movements in both sides are directly determined by this angle,thus affecting the compression ratio and valve timing,eventually the engine performance.Taking the structure characteristic and working process of 2S-OPCP into consideration,a one-dimensional simulation model was established,and the cylinder pressure curve was calibrated against experimental data.A comprehensive research was conducted to probe into the effects ofθon the scavenging process and engine performance.By adjustingθ,better engine performances can be achieved in various working conditions.Asθis increased from 0°to 10°,the scavenging process is ameliorated with a 3.5%increase of the air delivery ratio atθ=7°.Meanwhile,the indicated specific fuel consumption(ISFC)increases after the phase point ofθ=4°,and 3.5%higher ISFC is exhibited atθ=10°.The indicated mean effective pressure(IMEP)is increased by 3.3%atθ=4°,then decreased.
作者
何旭
丁昊宇
李耀宗
符璐鑫
李海鹰
许锴
He Xu;Ding Haoyu;Li Yaozong;Fu Luxin;Li Haiying;Xu Kai(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;Collaborative Innovation Center of Electric Vehicles in Beijing,Beijing 100081,China;China North Engine Research Institute,Tianjin 300405,China)
出处
《内燃机学报》
EI
CAS
CSCD
北大核心
2024年第2期153-160,共8页
Transactions of Csice
基金
国家自然科学基金资助项目(51976012).
关键词
二冲程对置活塞转盘发动机
压燃
压缩比
2-stroke opposed piston cam-plate engine
compression ignition
compression ratio
作者简介
何旭,博士,副教授,E-mail:hhexxu@bit.edu.cn;通信作者:许锴,博士研究生,E-mail:kki0815@163.com。
