某新型高功率四冲程柴油机燃烧室设计参数研究  

Parameter Study on Combustion Chamber for A Newly Developed High-Power Four Stroke Diesel Engine

作　　者：刘腾 宋雅丽 赵俊红 LIU Teng;SONG Yali;ZHAO Junhong(China Shipbuilding Power Engineering Institute Co.,Ltd.,Shanghai 201208,China)

机构地区：[1]中船动力研究院有限公司,上海201208

出　　处：《内燃机工程》2023年第4期31-38,共8页Chinese Internal Combustion Engine Engineering

摘　　要：以缸压、放热、油耗趋势、排放趋势、壁面传热、空气利用率作为衡量柴油机燃烧特性的关键,研究了某大功率四冲程柴油机17组不同燃烧室型线和喷嘴规格对燃烧特性的影响。研究表明,对于此类发动机,当喷孔数量、喷孔夹角、燃料流率和活塞碗型线中的3个变量固定时,8孔喷嘴具有更低的油耗、NOx排放,但缸盖、缸套传热较高;145°喷孔夹角喷嘴将导致燃油分布和燃烧过程较差,导致NOx排放和油耗偏高;高燃油流率可降低指示油耗和NOx排放,但缸盖传热增加,缸套传热降低;增加碗口与喉口的深度和角度都将导致NOx排放升高但油耗获得细微改善,增加碗口角度不利于提升空气利用率,增加喉口深度和角度均会导致缸盖和缸套的传热显著升高。The effects of 17 different groups of combustor profiles and nozzle specifications on the combustion characteristics of a high-power four-stroke diesel engine were analyzed.Cylinder pressure,heat release rate,fuel consumption trend,emission trend,wall heat transfer and air utilization were used as key points to evaluate the combustion characteristics of the engine.Results indicate that,for this type of engine,when three variables of nozzle number,nozzle cone angle,fuel flow rate and chamber profile are fixed,the 8-hole nozzle scheme can achieve lower fuel consumption and lower nitrogen oxide(NOx) emission,but the heat transfer of cylinder head and liner is higher.The 145° nozzle scheme cause poor fuel distribution and combustion process with higher fuel consumption and NOx emission.Higher fuel flow rate can reduce the fuel consumption and NOx emission,but the heat transfer of cylinder head increases and the heat transfer of cylinder liner decreases.Increasing depth and angle of bowl and throat cause higher NOx emission with slight improvement in fuel consumption,and increasing the angle of bowl is not conducive to improving air utilization.Increasing throat depth and angle can significantly increase the heat transfer of cylinder head and cylinder liner.

关 键 词：高速船用柴油机 燃烧室 喷嘴规格 流动燃烧 

分 类 号：TK422[动力工程及工程热物理—动力机械及工程]