微自由活塞动力装置中混合气泄漏对燃烧过程的影响

发布时间：2018-02-27 09:33

本文关键词： 内燃机微动力装置自由活塞泄漏均质充量压燃数值模拟　出处：《内燃机工程》2016年02期 　论文类型：期刊论文

【摘要】：利用数值模拟计算软件,结合甲烷详细化学反应动力学机理及动网格技术,对微自由活塞动力装置中自由活塞与微燃烧壁面之间不同间隙条件下压缩着火过程进行模拟计算。计算结果表明:相同条件下,随着间隙的增大,单次压缩着火周期增长,工作频率变小,但着火时刻点基本不变;间隙大小相同的条件下,活塞初速度越大,压缩比越大,动力输出性能越差。同时,对临界压缩比随着间隙大小的变化规律进行计算,分析得出在无泄漏条件下临界压缩比值为48,微动力装置压缩比大于临界压缩比时,混合气体才能压缩着火,且随着泄漏间隙的增大,临界压缩比值也随之增大。
[Abstract]:Using numerical simulation software, combined with the kinetic mechanism of detailed chemical reaction of methane and dynamic grid technology, The compression ignition process between the free piston and the micro combustion wall in the micro free piston power plant is simulated and calculated. The results show that the single compression ignition cycle increases with the increase of the clearance under the same conditions. The working frequency becomes smaller, but the ignition point is basically unchanged. The larger the initial velocity of piston is, the greater the compression ratio is, and the worse the dynamic output performance is when the clearance size is the same. At the same time, the variation of critical compression ratio with the gap size is calculated. It is concluded that when the critical compression ratio is 48 and the compression ratio is greater than the critical compression ratio under the condition of no leakage, the mixture can compress and ignite, and the critical compression ratio increases with the increase of the leakage gap.
【作者单位】：江苏大学能源与动力工程学院;
【基金】：国家自然科学基金项目(51076060) 江苏省研究生科研创新项目(CXZZ12_0672) 江苏大学高级人才科研启动基金项目(14JDG146)
【分类号】：TK401

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