Abstract：In order to investigate the effect of leakage on the working process of micro freepiston engine, the singleshot visual experiment of homogeneous charge compression ignition (HCCI) in micro freepiston engine was carried out to obtain different ignition characteristics under different leakage conditions. The multidimensional model with chemical dynamic and piston dynamic was established to simulate the process of HCCI. The results show that mixed gas leakage has slight effect on ignition time, while the leakage has severe effect on piston movement characteristic. Due to leakage, the pressure in the micro combustion chamber and the piston speed in the expansion process decrease with decreased performance of micro engine. The leakage gap and length are the main effect factors on the extent of gas leakage and the micro HCCI combustion processes. The larger the leakage gap is, the smaller the maximum pressure and the piston final velocity are, and the power performance becomes worse. With the increasing of leakage length, the maximum pressure increases to improve the power performance. During the research and design process of micro engine, attention should be paid to the sealing effect between cylinder and piston.
柏金, 王谦, 谢强, 张彭岗. 泄漏对微自由活塞发动机工作过程的影响[J]. 江苏大学学报（自然科学版）, 2014, 35(1): 14-19.
BAI Jin, WANG Qian, XIE Qiang, ZHANG Peng-Gang. Effect of leakage on working process of micro freepiston engine[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2014, 35(1): 14-19.
2014, Vol. 35 
