摘要
针对由沼气成分及其理化特性导致的内燃机燃用沼气时会发生燃烧速度慢、后燃严重、排气温度高等问题,将生物质燃气内燃机作为研究对象,基于可重用性及面向对象的Modelica语言建立内燃机模型库,将生物质燃气为燃料对四缸四冲程火花点火内燃机性能进行分析.通过仿真研究不同比例天然气(体积分数分别为33%,67%及100%)和LPG(体积分数分别为5%,10%及15%)对内燃机性能的影响,并在一台原汽油机改装的生物质燃气内燃机进行实验验证.结果表明:随着天然气/LPG的加入,内燃机的热效率及功率有所提高,且随着生物质燃气中天然气/LPG体积分数的增加,内燃机的热效率及功率也将相应增加,天然气/LPG的加入有利于内燃机燃烧;基于可重用性及面向对象的建模语言Modelica,不仅大大提高内燃机建模及仿真效率,也将有效改进内燃机的设计及参数优化.
Since the physical and chemical characteristics of biogas, some problems such as slow combustion speed, uncompleted burned fuel and high exhaust temperature will occur in its applications in engine. The biogas engine model library was built with the object-oriented language Modelica, the performance of a four-stroke spark-ignition gas engine operating with natural gas/ liquefied petroleum gas-biogas blends were investigated. Natural gas （33%, 67% and 100%） and liquefied petroleum gas （5%, 10% and 15%） were added to the biogas and were simulated as the fuel of SI engine. The effects of natural gas/liquefied petroleum gas-biogas blends on the performance of spark-ignition engine used for electricity production were numerical investigated, the results were validated through the experiments on a gasoline modified gas engine. The results suggest that.. There is an improvement in brake thermal efficiency and brake powers with the addition of natural gas/liquefied petroleum gas in biogas. The feature of reusable and object-orien- ted of Modetica will enhance the modeling and simulation of biogas engine performance greatly not only in accuracy but simulation efficiency, this would be efficient for the design and the optimum work of the biogas fuelled engine.
出处
《工程设计学报》
CSCD
北大核心
2011年第1期28-33,共6页
Chinese Journal of Engineering Design
基金
"十一五"国家科技支撑计划资助项目(2006BAJ04A09)
