张盼盼，郑清平，王恩浩，黎明，刘晓日

(1.河北工业大学 能源与环境工程学院,天津 300401;2.驻三五六厂军代室，云南 昆明 650114）

    摘要：本文建立了某四缸增压直喷柴油机的三维模型，研究喷孔夹角α对燃烧过程的影响，分别选取α=140°、α=150°和α=160°三种喷孔夹角模拟计算。研究结果表明：喷孔夹角α对燃油的空间分布影响很大。喷孔夹角α=140°时，过多燃油进入燃烧室底部，略微提升动力性的同时造成NO_x和Soot的排放升高；喷孔夹角α=160 °时,会造成大量燃油进入余隙容积，动力性下降，NO_x和Soot的减少。综合考虑各种因素，本文选取的最佳喷孔夹角α=150°。

    关键词：柴油机；喷孔夹角；燃油分布；NO_x；Soot

    Abstract:Three-dimensional model of a four cylinder Diesel engine established by applying with  Fire software. For the study of the nozzle angle influence on the combustion process,  three different nozzle angle were calculated, as 140  °,150 °and 160 °. The results showed that the nozzle angle had a great influence on the spatial distribution of the injected fuel. The  nozzle angle 140 °had too much fuel at the bottom of the combustion chamber, which slightly improved the engine performance along with high NO_x and Soot emissions. The nozzle angle 160 ° could cause a lot of fuel into the volume clearance, which decline the engine performance and had low NO_x and Soot emission. Comprehensive considering various factors, the best nozzle angle 150 °selected.

    Key Words:Diesel Engine;Nozzle Angle;Fuel Distribution; NO_x; Soot