喷气对相继增压柴油机切出过程影响研究  

Effect of air injection on the switching-out process of a sequential turbocharging diesel engine

作　　者：高占斌[1,2] 曹灿 王贺春 杨传雷[1] GAO Zhanbin;CAO Can;WANG Hechun;YANG Chuanlei(College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China;Marine Engineering Institute, Jimei University, Xiamen 361021, China)

机构地区：[1]哈尔滨工程大学动力与能源工程学院,黑龙江哈尔滨150001 [2]集美大学轮机工程学院,福建厦门361021

出　　处：《哈尔滨工程大学学报》2018年第3期490-495,共6页Journal of Harbin Engineering University

基　　金：国家科技支撑计划(2015BAG16B01);福建省自然科学基金项目(2015J01218);福建省科技厅资助省属高校专项基金项目(JK2014025)

摘　　要：为了改善相继增压系统切出过程中柴油机的瞬态性能,在最佳切出延迟时间时进行了切出过程的喷气试验,研究了喷气对柴油机瞬态性能的影响,并对缸内燃烧进行了三维流场计算。研究结果表明:采用了喷气技术后,由于柴油机的进气压力增加,柴油机瞬态性能得到了明显改善;转速波动减少了42%,达到稳定转速时气缸工作循环数减少了46%。排放性能也得到了改善,烟度排放量减少约50%,HC排放量减少了约30%,CO排放量减少了约35%,但是NOx排放量增加了约20%。This study performs an air injection test on the switching-out process at the optimum switching-out delay time to improve the transient performance of a diesel engine in the switching-out process of a sequential turbocharging system.The effect of the air injection on the transient performance of the diesel engine is investigated,and a three-dimensional flow field is calculated for the combustion inside the cylinder.The research results show that the transient performance of the diesel engine significantly improved after adopting the air injection technology because the inlet pressure of the diesel engine increased.Furthermore,the speed fluctuation decreased by42%,and the quantity of the working cycles of the air cylinder reduced by46%when the stable rotation speed was reached.The emission performance also improved.The smoke emission reduced by approximately50%,and the hydrocarbon emission reduced by approximately30%.Moreover,the CO emission reduced by approximately35%.On the contrary,the NO x emission increased by approximately20%.

关 键 词：喷气 柴油机 相继增压 切出过程 瞬态性能 排放性能 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]