点火定时对自由活塞内燃发电机运行特性的影响研究  

Study on the Influence of Ignition Timing on the Oper-ating Characteristics of a Free Piston Engine Generator

作　　者：赵俊臣 林智伟 杨太照 黄福军 ZHAO Junchen;LIN Zhiwei;YANG Taizhao;HUANG Fujun(School of Mechanical Engineering,North China University of Water Resources and Electric Power,Zhengzhou,Henan,450045,China)

机构地区：[1]华北水利水电大学机械学院,河南郑州450045

出　　处：《小型内燃机与车辆技术》2024年第4期14-20,共7页Small Internal Combustion Engine and Vehicle Technique

基　　金：河南省科技攻关项目(22A470007);河南省大学生创新创业项目(2022XA043,2022XA036,2023XB179)。

摘　　要：精准的点火控制是实现自由活塞内燃发电机(FPEG)稳定运行的关键。设计了一款应用于FPEG的非接触式光电控制点火系统,通过试验和数值仿真研究了点火定时对FPEG运行特性的影响。试验研究结果表明,采用该光电控制点火系统,实现了FPEG连续稳定运行。随着点火触发点逐渐远离气缸顶部,发动机运行频率、缸内平均压力和平均指示功率均呈现先增加后减小的趋势;发动机最佳点火位置距离气缸顶部9 mm处,该工况下发动机的运行稳定性最佳。数值仿真研究结果表明,发动机气缸内火焰呈球形传播,随着点火触发点与气缸顶部的距离增大,火焰传播速度逐渐降低,总的放热量则呈现先增加后减少的趋势。Accurate ignition timing is the key to the stable operation of the free piston engine generator(FPEG).A non-contact photoelectric control ignition system was designed,and the influence of ignition timing on the operation characteristics of the engine was studied experimentally and numerically.The experimental results show that the FPEG achieves stable operation with the photoelectric control ignition system.As ignition timing gradually moves away from the cylinder head,the operating frequency,average in-cylinder pressure and indicated power of the engine increase first and then decrease.The optimal ignition trigger point is 9mm from the cylinder head.Under the optimal ignition point condition,the engine presents best operating stability.The numerical results show that the in-cylinder flame propagates spherically,and the flame propagation speed decreases with the increase of the distance between the ignition position and the cylinder head.Meanwhile,the total heat release amount is increased first and then decreased.

关 键 词：自由活塞内燃发电机 光电控制点火系统 点火触发点 运行稳定性 

分 类 号：TK441[动力工程及工程热物理—动力机械及工程]