单体泵断油过程中控制阀区域流场特性.pdf

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1、第31卷(2013)第4期内燃机学报TransactionsofCSICEVo1．31(2013)No．4文章编号：1000．0909(2013)04—0367—0631．058单体泵断油过程中控制阀区域流场特性仇滔，雷艳，彭璨，李旭初，李彬(北京工业大学环境与能源工程学院，北京100124)摘要：电控单体泵控制阀打开将导通高低压油路，实现断油控制．在断油过程中，大量高压燃油将通过控制阀狭小区域高速流入低压油路，该区域流场十分复杂，对单体泵卸压断油特性影响很大．在电控单体泵泵体上设计了光学透视窗口，采用高速摄像仪器，获得控制阀开启过程在不同开度下控制阀

2、出口端的流场照片，并对照片进行处理．结合测量获得的控制阀位移以及对应的进出口瞬态压力，采用三维仿真软件开展了控制阀区域瞬态流场的仿真计算．试验证明了该区域在阀打开过程中存在两相流．仿真表明控制阀区域空化主要产生在3个区域：阀口锥角处、锥角下游以及阀芯与挡板间隙处．结合仿真计算获得的流场和压力场，分析了3个区域空化产生的原因．关键词：单体泵；控制阀；空化；仿真中图分类号：TK427文献标志码：AOWCharacteristicsofSolenoidControlValveDuringFuelStoppingProcessfortheUnitPumpQIU

3、Tao，LEIYan，PENGJing，LIXu—chu，LIBin(CollegeofEnergyandEnvironmentalEngineering，BeijingUniversityofTechnology，Beijing100124，China)Abstract：Thesolenoidvalveintheunitpumpsystem(UPS)controlsthepressurebuildupwithinthehigh-pressurefuelline．Whenitisopened，thehigh-pressurefuelflowswithh

4、ighvelocityfromthenarrowcross-sectionintothelow—pressurefuelline．Duringitsoperation，theflowinthefieldofsolenoidvalveisquitecomplexandaffectstheperformanceofUPS．ThisstudypresentsavisualizationtestmethodofthesolenoidvalveoftheUPS．Fortheopticalobservation，aglasswindowwasincorporate

5、dintothepump．Thebubblesinducedbythecavitationundervariousoperatingconditionswereobservedbyahigh—speedcamera．Allcolorimagesweretransformedintothegraypictures．Simulationwasconductedonthebasisofthetestdatasuchasthepressureandthedisplacementofvalvecore．Thetestresultsshowthatcavitati

6、onphenomenonoccursduringtheopeningprocessofcontrolvalve．Thesimulatedresultsofcavitationregula—tionincontrolvalveagreewellwiththeexperimentalresults．Simulationresultsshowthatcavitationsinthecontrolvalvemainlyoccuratthreepositions，theyare，theconeangleofvalveport，thedownstreamofcon

7、eangleandtheclearancebetweenthevalvestopandthecore．Thereasonsofcavitationgeneratedinthosepositionswerediscussedbasedonthesimulationresultsoftheflowandthepressurefields．Keywords：unitpump；solenoidvalve；cavitation；simulation为了适应日益严格的排放法规和燃油经济性导通或断开，从而调节燃油压力，实现喷射控制．由求，燃油系统控制方式由机械式全面

8、转变为电子控控制阀运动速度快、阀口尺寸小、流速高和压差式¨．目前大部分电控高压燃油系统是通过电