附加升程参数耦合对柴油机进气状态参数的影响  

Influence of additional lift parameters' coupling on intake air state of diesel engine

作　　者：韩志强 何文潇 田维 韩伟强 夏琦[2] HAN Zhi-qiang;HE Wen-xiao;TIAN Wei;HAN Wei-qiang;XIA Qi(School of Automotive and Transportation, Xihua University, Chengdu 610039, Sichuan, China;Wenzhou University Oujiang College, Wenzhou 325035, Zhejiang, China)

机构地区：[1]西华大学汽车与交通学院,四川成都610039 [2]温州大学瓯江学院,浙江温州325035

出　　处：《长安大学学报（自然科学版）》2018年第3期107-115,共9页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51406137);教育部春晖计划项目(Z2014059);测流体及动力机械教育部重点实验室开放基金项目(szjj2016-006);西华大学研究生创新基金项目(ycjj2016089)

摘　　要：为了研究进气门升程曲线在附加升程持续角与附加升程高度的耦合作用下对柴油机进气状态参数的影响。以1台DK4A轻型柴油机为基础搭建了热力学模型,以发动机转速n=2 800r/min,50%负荷(扭矩110N·m)工况下获得的试验数据为边界条件,在模型中导入呈不同升程趋势的进气门升程曲线(不同附加升程持续角和附加升程高度),利用数值模拟与试验相结合的方法,获得不同的进气状态参数(进气流量、缸内压缩上止点温度、缸内压缩上止点压力),系统分析附加升程持续角与附加升程高度的耦合作用对进气状态参数的影响,并探讨两者对进气状态参数影响权重的变化规律。研究结果表明:在附加升程高度与附加升程持续角的耦合作用对进气状态参数的影响关系中,单位附加升程持续角的影响权重大于单位附加升程高度的影响权重;在k倍单位附加升程高度对应的进气状态参数变化率与单位附加升程持续角对应的进气状态参数变化率等量影响权重关系中,当进气状态参数变化率为定值时,随着k值增加,等量影响权重关系曲线往附加升程高度与附加升程持续角均增大的方向移动,与此同时,在附加升程高度和附加升程持续角越大的区域,k倍单位附加升程高度对进气状态参数变化率的影响权重大于单位附加升程持续角的影响权重。In order to investigate the effects of coupling durational of additional valve lift and addition valve lift on intake air state parameters of diesel engine. Based on a thermodynamic model with reference to DK4A light diesel engines, various intake air state parameters were acquired by means of numerical simulation and experiment, where the model of simulation had various intake valve lift curves which had different lift trends imported, with the boundary condition of test data at operating condition of 2 800 r/min and 50% loads. Then the influence of the coupling effects of additional lift duration angle and additional lift height on intake air state parameters were analyzed systematically, and the changing principle of influence weight was also researched. The results show that during the coupling effect relationship between the durational of additional valve lift and addition valve lift intake air state parameters, the impact weight of unit durational of additional valve lift is greater than the unit addition valve lift, while in the relationship between k times unit addition valve lift and durational of additional valve lift as equivalent impact weight of the change rate of intake air state parameters, when the change rate is fixed, with the increase of k, the curve of the equivalent relationship moves toward a direction which durational of additional valve lift and addition valve lift are increasing. Among the area of the larger of the two parameters indicate that the impact weight of k times unit addition valve lift is greater than the weight of unit durational of additional valve lift. 1 tab, 18 refs, 20 refs.

关 键 词：汽车工程 柴油机 数值模拟 附加升程曲线 耦合 进气状态参数 影响权重 

分 类 号：U464.172[机械工程—车辆工程] TK422.3[交通运输工程—载运工具运用工程]