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ID:5295644
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时间:2017-12-07
《增压状态下汽油机进气道性能评价及流通特性分析_祖炳锋》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第45卷第10期天津大学学报Vol.45No.102012年10月JournalofTianjinUniversityOct.2012▋增压状态下汽油机进气道性能评价及流通特性分析1,21111111祖炳锋,王振,徐玉梁,刘捷,潘栋超,杜建秋,丛玉坤,郝长利(1.天津大学内燃机研究所,天津300072;2.天津大学机械工程学院,天津300072)摘要:针对某增压汽油机开发过程中进气道性能评价问题,建立了三维稳态及瞬态仿真模型,研究了增压状态下进气道无量纲流量系数、总体流量、缸内流动及喉口流速的变化规律.结果表明:随着进气压差的增大,气道无量纲流量系数明显降低,最大降幅
2、达11%,但总体流量仍呈增长趋势;增压以后,气流速度大幅提升,大气门升程下,气门阀座处产生分离涡旋运动,加剧缸内扰动,有利于加快燃烧速度,降低爆震倾向;同时,气道流通截面流速增大,最高进气马赫数为0.46,处于安全范围.综合各项数据,判定该气道性能满足增压机型需求.关键词:增压状态;进气道;流量系数;流场分布;流通截面流速中图分类号:TK411.8文献标志码:A文章编号:0493-2137(2012)10-0865-05IntakePortPerformanceEvaluationandFlowCharacteristicAnalysisofGasolineEngin
3、eUnderBoostedCondition1,211111ZUBing-feng,WANGZhen,XUYu-liang,LIUJie,PANDong-chao,DUJian-qiu,11CONGYu-kun,HAOChang-li(1.InternalCombustionEngineResearchInstitute,TianjinUniversity,Tianjin300072,China;2.SchoolofMechanicalEngineering,TianjinUniversity,Tianjin300072,China)Abstract:Inordert
4、oevaluatetheperformanceofintakeportduringthedevelopmentofaturbochargedgasolineen-gine,three-dimensionalsteadyandtransientsimulationmodelsweredeveloped.Thechangeregulationsofno-dimensionaldischargecoefficient,totalmass,in-cylinderflowstructureandthrottleflowvelocitywereinvestigatedunderb
5、oostedcondition.Resultsshowthatwithintakeportpressuredropincreasing,theno-dimensionaldischargecoefficientofintakeportdecreasedobviously,andthemaximaldeclinereached11%.However,thetotalmassflowwasincreasingallthetime.Afterboosting,flowvelocityincreasedsharply.Athighvalvelift,flowseparated
6、ontheshortsideoftheport,andgeneratedamorehighlydisturbedflowstructure,whichwashelpfulforacceleratingburnrateandachievinggoodknockresistance.Meanwhile,throttleflowvelocityincreasedapparently,andtheintakeflowMachnumberwas0.46tothehighestpoint,whichisstillconsideredtobereasonable.Asaresult
7、,theportisjudgedtobesuitablefortheturbochargedengine.Keywords:boostedcondition;intakeport;dischargecoefficient;flowdistribution;throttleflowvelocity近年来,降低燃油消耗率及二氧化碳排放量已成增压汽油机研发过程中迫切需要解决的问题.常规为汽油机研究的焦点,基于涡轮增压的汽油机小型强气道性能评价主要通过稳流试验台完成,但传统气道化作为实现上述目标的重要手段被广泛运用和发稳流试验台所能提供的气道压差多在7,kP
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