【作者】

Liping Yang

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。Exhaust emissions from marine diesel engines are considered to be one of the most significant contributors to air pollution. For this reason, NOx regulation and fuel sulphur limits have become increasingly strict. Clean alternative fuels are playing an increasingly important role in the internal combustion engine industry. Among them, natural gas is a preferred choice due to its abundant sources, clean combustion and low CO2 emission level. Recently, manifold multi-point gas injection technology was adopted by engine manufactures to improve the consistency of gas fuel supplied to each cylinder and response to load changes. However, the characteristics of manifold gas injection have a significant influence on combustion and emissions of marine lean-burn natural gas engines. It is therefore vital to investigate the effect of gas nozzle structures and gas injection control on in-cylinder mixture formation and the combustion process. In this study, numerical simulation techniques were adopted to analyse the influence of the nozzle structure on the intake mixture and combustion process in natural gas engine. The results show that for the marine lean burn natural gas engine with throttle, the design scheme of the cross multi-hole gas nozzle can improve the intake mixture and in-cylinder combustion at higher engine load. However, the structure of single-hole gas nozzle can provide higher kinetic energy and achieve rapid intake of gas fuel, which is beneficial to the in-cylinder mixture and stratification combustion at lower engine load. Based on the research results, some gas nozzle products we developed have been widely applied to the China inland river ships market.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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