基于可变压缩比技术大功率低热值气体燃料发动机性能优化  

Performance Optimization of Heavy-duty Low-heat Value Gas Engine Based on Variable Compression Ratios

作　　者：魏洪元 葛文庆[1] 梁箫箫[1] 李波[1] 

机构地区：[1]山东理工大学交通与车辆工程学院,淄博255049

出　　处：《科学技术与工程》2017年第16期61-67,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51505263);山东省自然科学基金(ZR2016EL15);山东省科技发展计划(2014GGX103007);淄博市科技发展计划(2014kj020017)资助

摘　　要：为充分利用低热值气体燃料以缓解能源危机带来的压力,改善大功率低热值气体燃料发动机的燃烧过程和热效率,建立了大功率低热值气体燃料发动机的热力学循环仿真模型。研究了可变压缩比对发动机各负荷下性能和燃烧过程的影响规律,并对各工况下的压缩比进行数值优化。结果表明:大功率低热值气体燃料发动机应用可变压缩比技术,可以使发动机适应不同成分和理化性质的低热值燃料。部分负荷工况下,可以使发动机压缩比大幅提高,提高部分负荷下混合气压缩效果,改善了发动机的燃烧过程。应用可变压缩比技术,在中等负荷工况下热效率改善效果在4%~8%左右,小负荷较高转速下,热效率改善效果接近10%。可变压缩比改善了大功率低热值气体燃料发动机的热效率,为充分利用低热值气体燃料奠定了理论基础。In order to make full use of low-heat value gas fuel to alleviate the energy crisis brought pressure,improve the combustion process and thermal efficiency of heavy-duty low-heat value gas engine,establish engine cycle simulation model of heavy-duty low-heat value gas engine,study the effects of variable compression ratio on performance the engine load and combustion process,and the compression ratio of the engine under different load conditions is optimized. The results show that heavy-duty low-heat value gas engine using variable compression ratio technology can make the engine to adapt to different components and physical and chemical properties of low-heat value fuel; under partial load conditions,the engine compression ratio can be greatly improved,and the effect of mixing under partial load is increased,and the combustion process of the engine is improved; By using the variable compression ratio technology,the thermal efficiency improvement effect is about 4% - 8% under moderate load condition,and the thermal efficiency is close to 10% under low load and high speed. Variable compression ratio improves the thermal efficiency of heavy-duty low-heat value gas engine,and lays a theoretical foundation for making full use of low-heat value gas fuel.

关 键 词：大功率低热值气体燃料发动机 可变压缩比 热效率 发动机性能 爆震 

分 类 号：TK464[动力工程及工程热物理—动力机械及工程]