发动机废气涡轮增压系统的能量流研究  

A Study on the Energy Flow of Diesel Engine Turbocharged System

作　　者：刘敬平[1,2] 付建勤[1,2] 冯康[1,2] 赵智超[1,2] 王树青[1,2] 

机构地区：[1]湖南大学汽车车身先进设计制造国家重点实验室,湖南长沙410082 [2]湖南大学先进动力总成技术研究中心,湖南长沙410082

出　　处：《湖南大学学报（自然科学版）》2011年第5期48-53,共6页Journal of Hunan University:Natural Sciences

基　　金：国家重点基础研究发展计划(973计划)资助项目(2011CB707201);湖南省研究生科研创新基金资助项目(CX2010B125);国家高技术研究发展计划(863计划)资助项目(2008AA11A116;2008AA11A135)

摘　　要：基于发动机一维性能仿真计算和试验相结合的方法,对某型轿车用柴油机的废气涡轮增压系统能量流分布规律进行了研究.通过研究发动机排气能量在涡轮机-压气机-中冷器中的传递过程,得出了涡轮机回收排气能量的潜力和增压系统的能量流特性.结果表明:增压系统能量流分布和排气能量回收效率主要取决于发动机和增压器的运行工况;外特性下,在增压器低效率区和高效率区涡轮机分别回收约6%和13%的排气能量;其中,增压器大约只利用了2%的排气能量用于提高进气压力能.研究结果为发动机节能和采用复合涡轮增压回收排气能量提供了理论依据.Presented in this paper is the energy flow distribution of a diesel engine turbocharged system,on the basis of a combined method of one-dimensional gas dynamics simulation and dyno tests.By analyzing the flow path of exhaust gas energy flow from turbine to compressor and then intercooler,the exhaust gas energy recovery potential by turbocharging was obtained,and the energy flow characteristics in the diesel engine turbocharged system was analyzed.The results have shown that the energy recovery potential is strongly dependent on the engine＇s and the turbo＇s operational conditions.About 13% of engine exhaust gas energy could be recovered by the turbocharger when the latter works in the high efficiency domain,while only about 6% could be recovered in the low efficiency domain.Under all operational conditions,around 2% of the recovered exhaust gas energy is used to boost the intake gas pressure,and the rest is taken away by the intercooler.The results have provided theoretical basis and fundamental data for engine fuel saving through exhaust gas energy recovery by turbocharging or turbo-compounding.

关 键 词：发动机 废气涡轮增压 能量流 余热回收 GT-POWER 

分 类 号：TK402[动力工程及工程热物理—动力机械及工程]