摘要
为缓解因生物柴油粘度过大,导致的燃烧及性能恶化问题,以4190ZLC柴油机为实验平台上,利用CHEMKIN耦合AVL-Fire软件构建三维CFD模型,在生物柴油掺混比40%(B40)、废气再循环(EGR)率12.5%基础上,设置四组进气压力:0.173 MPa、0.193 MPa、0.213 MPa和0.233 MPa,进行分析.结果表明:适当提高进气压力有助于燃油雾化,使缸内燃烧更加平稳,同时进一步降低NOx排放,进气压力为0.233 MPa时,着火时刻提前1.5℃A,对应NO排放比0.183 MPa时降低12.68%,比原机降低85.20%,指示功率为原机的84.6%.研究结果可为船用柴油机双燃料低温燃烧性能优化提供一定的指导依据.
In order to alleviate the problems of combustion and performance deterioration caused by the excessive viscosity of biodiesel,the 4190 Z_LC diesel engine was used as the experimental platform to build a three-dimensional CFD model using CHEMKIN coupled with AVL-Fire software. The blending ratio of biodiesel was 40%(B40) and exhaust gas. Based on the recirculation(EGR) rate of 12.5%,four sets of intake pressures of 0.173 MPa,0.193 MPa,0.213 MPa and 0.233 MPa are set for analysis. The results show that appropriately increasing the intake pressure which helps fuel atomization,makes the combustion in the cylinder more stable,and further reduces NOx emissions. When the intake pressure is 0.233 MPa,the ignition time is 1.5 ℃A earlier than before,and the corresponding NO emissions are lower 12.68% than the corresponding of 0.183 MPa,which lower 85.20% than the original machine value. The indicated power is 84.6% of the original machine. The research results can provide certain guidance for the optimization of dual-fuel low-temperature combustion performance of marine diesel engines.
作者
衡伟
胡登
黄加亮
HUANG Jia-liang;HU Deng(Marine Engineering Institute,Jimei University,Xiamen Fujian 361021,China;Fujian Provincial Key Laboratory of Naval Architecture and Ocean Engineering,Xiamen Fujian 361021,China)
出处
《广州航海学院学报》
2020年第4期28-33,共6页
Journal of Guangzhou Maritime University
基金
福建省自然科学基金资助项目(2018J01499)。
关键词
柴油机
双燃料
进气压力
diesel engine
dual fuel
intake pressure
