复合供气压燃式天然气发动机的燃烧过程  

Study on Combustion Process of Compression Ignition Natural Gas Engine with Compound Fuel Supply System

作　　者：郑清平[1] 张惠明[2] 朱志强[2] 张德福[2] 

机构地区：[1]天津工业大学机械电子学院 [2]天津大学内燃机燃烧学国家重点实验室

出　　处：《农业机械学报》2007年第8期1-4,18,共5页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家自然科学基金资助项目(项目编号:50276041)

摘　　要：根据分层燃烧的理论,设计了分隔室复合供气式压燃天然气发动机。采用化学动力学与CFD耦合的方法,对该发动机在复合供气方式下的着火和燃烧机理进行了模拟计算。结果表明,复合供气模式下由于在主、副燃烧室中可形成较明显的温度分层和浓度分层,实现了分层燃烧方式,获得了较宽的运行范围,平均指示压力达到0.63MPa,比进气道供气模式约高50%。A natural gas engine with a separate chamber and compound fuel supply system was designed based on stratification combustion theory. Simulation of ignition and combustion mechanism of the engine was carried out by coupling multidimensional computational fluid dynamic （CFD） code FIRE with detailed chemical kinetic mechanism. The results showed that it is possible to achieve stratification of mixture concentration and temperature in main chamber and by-chamber, and realize stratified combustion mode of compound fuel supply so as to have broaden operating range. The mean indicates pressure reached 0.63 MPa and is 50~ higher than mode of inlet fuel supply.

关 键 词：天然气发动机 压缩燃烧 复合供气 分层燃烧 

分 类 号：TK432[动力工程及工程热物理—动力机械及工程]