基于膨胀比的自由活塞发动机理想热力循环分析

为提高传统发动机的热效率,降低燃料消耗成本,减少尾气排放,该文建立了基于增压中冷和Atkinson循环的四冲程自由活塞发动机理想热力循环模型,着重分析了膨胀比对自由活塞发动机热力过程的影响,提出了膨胀极限的概念,通过数值模拟方法对膨胀比与发动机热效率关系进行了仿真研究和试验验证,结果表明,通过增大膨胀比可使发动机的热效率提高10%;膨胀终了温度降低500K以上。研究结果可为自由活塞发动机在混合动力车辆上的应用提供参考。...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 11; pp. 37 - 43
Main Author 尹凝霞 常思勤
Format Journal Article
LanguageChinese
Published 南京理工大学机械学院,南京 210094%广东海洋大学工程学院,湛江 524088 2013
Subjects
数值分析
热力循环
膨胀比
自由活塞发动机
自由活塞发动机
热力循环
数值分析
numerical analysis
expansion ratio
thermodynamics
膨胀比
free piston engine
Online AccessGet full text
ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.11.005

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Summary:为提高传统发动机的热效率,降低燃料消耗成本,减少尾气排放,该文建立了基于增压中冷和Atkinson循环的四冲程自由活塞发动机理想热力循环模型,着重分析了膨胀比对自由活塞发动机热力过程的影响,提出了膨胀极限的概念,通过数值模拟方法对膨胀比与发动机热效率关系进行了仿真研究和试验验证,结果表明,通过增大膨胀比可使发动机的热效率提高10%;膨胀终了温度降低500K以上。研究结果可为自由活塞发动机在混合动力车辆上的应用提供参考。
Bibliography:11-2047/S
free piston engine; thermodynamics; numerical analysis; expansion ratio
One of the major alternatives of the Otto engine has been examined to determine its potential for increased thermal efficiency in the spark ignited combustion engine is to lengthen the expansion process relative to the compression process. The modified Otto engine is called a free piston engine. Free piston engines received more attention among researchers in the recent past as a promising technology for a hybrid electric vehicle, and the potential advantages of the free piston engine are including a variable compression ratio and expansion ratio, possible multi-fuel operation, small friction and so on. In order to compare the thermal efficiency of the free piston engine and the Otto engine, the ideal thermodynamic cycle models of the four-stroke free piston engine developed based on the supercharged theory of Atkinson cycle and the conventional four-stroke engine based on Otto cycle in the paper. For the ideal thermodynamic cycle
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.11.005