摘要
随着微燃烧室尺寸的缩小,微自由活塞动力装置结构参数的微小变化会影响其工作稳定性及输出功率的大小.为了开发出性能优良的微动力装置,结合动网格技术,采用FLUENT软件对微自由活塞动力装置参数设计进行了数值模拟计算.研究结果表明,当微燃烧室体积为212 mm3时,活塞获得的压缩初动能应略大于临界压缩着火初动能值0.2 J,均质气体可以压缩燃烧,且活塞运行过程最为稳定;在相同压缩初动能条件下,活塞质量为1 g时,活塞动能增量最大,且微动力装置工作比较平稳;当微燃烧室体积为212 mm3,直径为4 mm时,微动力装置更容易启动,且输出功率最大.
With the decrease in size of micro combustion chamber, the tiny change of micro free-piston power device structure parameters could affect the working stability and the power output. In order to develop micro power device with excellent performance, the numerical simulation combined with the technology of dynamic mesh was performed to study the parameter design of micro free-piston device by FLUENT. The results showed that, the homogeneous gas could be compressed to combust when the piston compression initial kinetic energy is a little higher than the critical one which is 0.2 J, and the piston running process is the most stable when the micro-chamber volume is 212 cubic millimeter. Besides, the piston kinetic energy increment is the maximum and the micro-power-device running is relatively stable when the piston mass is 1 g under the same compression initial kinetic energy condition. And the results also indicated that the micro power device can be easier to start and the output power can reach the maximum when the micro-chamber diameter is 4 mm.
出处
《南通大学学报（自然科学版）》
CAS
2015年第1期16-22,共7页
Journal of Nantong University(Natural Science Edition)
基金
国家自然科学基金项目(51476071)
江苏高校优势学科建设工程项目(苏教材〔2011〕8号)
江苏大学高级人才科研启动基金项目(14JDG146)
关键词
微动力装置
自由活塞
均质压缩燃烧
参数设计
数值模拟
micro power device
free-piston
homogeneous charge compression ignition
parameter design
numerical simulation
