甲醇替代率对柴油机能量流影响分析.pdfVIP

研究与探讨能源研究与管理2023,15(3)·85.

D0I:10.16056/j.2096-7705.2023.03.013

甲醇替代率对柴油机能量流影响分析

任鹏

(武警士官学校机械系，杭州311400)

摘要：为深人理解预混甲醇／柴油双燃料发动机能量流分布，基于Converge软件构建了甲醇／柴油双燃料全气道

发动机三维仿真模型，进行了不同甲醇替代率下柴油机的能量流平衡分析。结果表明：随着甲醇替代率增大，缸压

峰值和放热率峰值增大，燃烧重心提前，燃烧持续期缩短。添加甲醇后，NOx、CO和Soot呈现下降趋势，但在喷

油时刻附近会增加局部HC生成量。相比纯柴油机，添加甲醇后指示功、进排气以及传热部分的能量减少，杂项的

占比不断升高。

关键词：甲醇柴油双燃料；甲醇替代率；能量平衡；热效率

中图分类号：TK427文献标志码：A文章编号：2096—7705（2023）03—0085—06

AnalysisoftheEffectofMethanolSubstitutionRatioon

theEnergyFlowofDieselEngines

RENPeng

(MechanicalDepartment,PeoplesArmedPoliceForceAcademy,Hangzhou311400,China)

Abstract:Todeeplyunderstandtheenergyflowdistributionofthepremixedmethanol/dieseldual-fuelengine,athree-dimen-

sionalsimulationmodelofthemethanol/dieseldual-fuelall-airwayenginewasconstructedbasedonConvergesoftware,and

theenergyflowbalanceanalysisofthedieselenginewascarriedoutunderdifferentmethanolsubstitutionratios.Theresults

showedthatwiththeincreaseofmethanolsubstitutionratio,thepeakcylinderpressureandthepeakheatreleaserate

increased,thecenterofgravityofcombustionwasadvanced,andthecombustiondurationperiodwasshortened.After

methanoladdition,NOx,COandSootshowadecreasingtrend,butlocalHCgenerationincreasesneartheinjectionmoment.

Comparedtothepuredieselengine,theindicatedwork,intakeandexhaust,andheattransferportionsoftheenergyare

reducedwiththeadditionofmethanol,andthepercentageofmiscellaneousitemsisincreasing.

Keywords:methanol-dieseldualfuel;methanolsubstitutionrate;energybalance;thermalef