AMESIM培训资料发动机01_ENG2_part2

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1、AME_ENG2TheIFP-EngineLibraryBenoitDESPUJOLS–IMAGINES.A.EngineBusinessUnit©IMAGINESA1998-2006Updated:July2006Training2目录1.IFPengine概述2.发动机整体参数3.建模举例©IMAGINESA1998-2006Updated:July2006Training3IFP-EngineChapter2:整体参数整体参数概述液态燃油和气体属性发动机定义全局变量©IMAGINESA1998-200

2、6Updated:July2006Training4整体参数定义IFP-Engine参数多缸发动机模拟引起许多冗余参数为了避免冗余参数，发动机整体参数在无端口的图标中定义在整体模型ENGMD00,ENGDEF00,ENGVDEF01中定义的数据，可以被其它发动机子模型引用。这些参数被叫作‘整体参数’.注意：发动机库中的‘整体参数’与AMESimglobalparameters不是一个概念.©IMAGINESA1998-2006Updated:July2006Training5整体参数整体参数模式:参数来自

3、ENGDEF00或ENGVDEF01模型局部参数模式:在部件自身参数表中定义©IMAGINESA1998-2006Updated:July2006Training6液态燃油属性如果认为喷油为气态,则可以不考虑液态燃油属性.采用“THH液态燃油属性：用于详细模拟喷油器和供油系统(采用THH&THCD库).©IMAGINESA1998-2006Updated:July2006Training7液态燃油属性标准燃油属性数据(defaultvaluesinmodels)汽油:C8H18,柴油:C12H26用户自定义数据

4、AyrfuelStoichiometrycalculationAFR(x)(13.773).化学计量比:Fstoich4rairAFR=空燃比[null]A=空气质量[kg]F=燃油质量[kg]rfuel:fuelspecificgasconstant[J/kg/K]rair::airspecificgasconstant[J/kg/K]0.793.7730.21(freshair)在THH模式被忽略©IMAGINESA1998-2006Updated:July2006Training8混合

5、气属性IFP-Engine处理3种气体混合:新鲜空气-燃油蒸汽-废气4种气体复杂度:定属性线性变化:interpolationbetween2temperaturesTHPNtype:T²influenceJanaf/Yaws:2temperaturerange,T4dependencystoichiometric燃烧方程式:y0.79y0.79yCxHyxO2N2xCO2H2OxN240.2120.214燃油蒸汽新鲜空气废气(stoichio

6、metriccombustion)©IMAGINESA1998-2006Updated:July2006Training9混合气属性用ASCII文件定义气体属性(freshair,fuel,BurnedGases:BG)©IMAGINESA1998-2006Updated:July2006Training10混合气属性在文件中定义复杂度index=300:Constantgaspropertiesindex=3000:Linearproperties(interpolationbetween2temperat

7、ures)index=3:THPNtype(T²influence)index=30:Janaf/Yaws(2temperaturerange,T4dependency)©IMAGINESA1998-2006Updated:July2006Training11废气排气由上述3种气体中的几种组成:Stoichiometriccombustion:y0.79y0.79yCxHyxO2N2xCO2H2OxN240.2120.214RichcombustionΦ>1:

8、y0.79y0.79yCxHyxO2N2xCO2H2OxN2(1)CxHy40.2120.214LeanCombustionΦ<1:y0.79y0.79yCxHyxO2N2xCO2H2OxN2(1)O240.2120.214©IMAGINE