耿鹤鸣, 汪洋, 姜慧慧, 李国田, 朱永生, 田相龙.液压自由活塞发动机中HCCI燃烧优化的试验研究[J].内燃机工程,2017,38(3):9-14.
液压自由活塞发动机中HCCI燃烧优化的试验研究
Experimental Study on HCCI Combustion Optimization of Hydraulic Free Piston Engine
DOI：
关键词:内燃机  液压自由活塞发动机  均质压燃  指示效率  正庚烷
Key Words:C engine  hydraulic free piston engine（HFPE）  homogeneous charge compression(HCCI)  indicated efficiency  n-heptane
基金项目:国家自然科学基金项目（51176137, 51476113）
作者单位
耿鹤鸣, 汪洋, 姜慧慧, 李国田, 朱永生, 田相龙 天津大学 内燃机燃烧学国家重点实验室, 天津 300072 
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摘要:使用液压自由活塞发动机（HFPE）进行试验, 研究了正庚烷在均质压燃（HCCI）燃烧过程中, 当量比与压缩比对低温反应始点、高温反应始点、两阶段放热量比例及指示效率的影响。研究结果表明：压缩比一定时, 混合气当量比越低, 低温反应始点越提前, 高温反应始点越推迟, 同时低温反应释放热量与高温反应释放热量的比例越高；当量比一定时, 压缩比越大, 低温反应始点与高温反应始点均提前, 同时低温反应释放热量与高温反应释放热量比例越低；当量比从0.30增大到0.40的过程中, 最大指示热效率有略微减小的趋势, 其中最大值与最小值相差为3.0%；当量比一定时, 存在一个效率最高的压缩比, 压缩比过低或过高都会影响热功转化效率的提高。
Abstract:An experimental study on a hydraulic free piston engine（HFPE） was made, focusing on homogeneous charge compression ignition（HCCI） process. The effects of mixture equivalent ratio and compression ratio on reaction starting points at low and high temperatures, two-stage heat release ratio and indicated efficiency were analyzed. The result shows that when the compression ratio is constant, the lower the mixture equivalent ratio is, the earlier the reaction starting point is at low temperature, the later the reaction starting point is at high temperature, and the higher the proportion is of reaction heat release at low temperature to that at high temperature； when the mixture equivalent ratio is constant, with the increase of the compression ratio, the reaction starting points at low and high temperatures are both advanced, and the ratio of reaction heat release at low temperature to that at high temperature is lower； when the mixture equivalence ratio increases from 0.30 to 0.40, the maximum indicated thermal efficiency is slightly reduced, and the difference between the maximum and the minimum is 3%； when the mixture equivalence ratio is constant, there is a best compression ratio for the maximum efficiency, and a compression ratio that is too low or too high is not conducive to improving the efficiency of thermal power transformation.
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