摘要
基于AVL FIRE仿真软件平台,利用计算流体力学(computational fluid dynamics,CFD)耦合详细化学反应机理建立了对置式液压自由活塞发动机的三维仿真模型。根据特殊运动规律下的燃烧过程,讨论了工作频率、当量比及压缩比对燃烧过程的影响。仿真研究表明:燃烧中的各参数对自由活塞式发动机的燃烧过程的影响主要通过燃烧相位来体现,燃烧相位过早会造成较高的压缩负功和过高的压力升高率,最高燃烧压力和燃烧负功均大幅度增加;燃烧相位过晚会导致燃烧条件恶化,出现燃烧中断。工作频率、当量比和压缩比三者良好配合,能够以较小的机械负荷获得较高的指示热效率。
A three-dimensional （3-D） computational fluid dynamics （CFD） model was established with AVL FIRE implemented with detailed chemical kinetics to investigate combustion process and scavenging process of an Opposed-Piston Hydraulic Free Piston Engine. The effect of working frequency, equivalent ratio and compression ratio on combustion process was studied. The simulation result indicates that, the effect of the engine performance parameters can all be reflected through combustion phase. The peak pressure raise rate, peak pressure and compression negative work are raised dramatically with the combustion phase advanced; while the combustion conditions are deteriorated with the combustion phase delayed. When using proper matching of these parameters, a higher indicated thermal efficiency can be achieved with a lower mechanical load.
出处
《内燃机工程》
EI
CAS
CSCD
北大核心
2016年第2期26-32,共7页
Chinese Internal Combustion Engine Engineering
基金
天津大学内燃机自主创新项目(ssy00002)
关键词
内燃机
液压自由活塞
均质充量压燃
化学反应动力学
仿真
IC engine
hydraulic free-piston
homogeneous charge compression ignition（HCCI）
chemical reaction kinetics
simulation
