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ID:52347550
大小:3.55 MB
页数:7页
时间:2020-03-26
《压电晶体外开式汽油喷油器喷雾形态研究.pdf》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44卷第5期2015年10月小型内燃机与车辆技术SMALLINTERNALCOMBUSTIONENGINEANDVEHICLETECHNIQUEV01.44No.5Oet.2015压电晶体外开式汽油喷油器喷雾形态研究宋东先啦李文彬位耿路1.2姜兴洪怔赖海鹏1·2高定伟1·2(1一长城汽车股份有限公司技术中心河北保定0710002一河北省汽车工程技术研究中心)摘要:采用激光阴影的方法,在喷雾定容弹试验台上研究了不同边界条件对压电晶体外开式汽油喷油器的喷雾形态的影响,压电晶体外开式汽油喷油器的应用主要是针对喷雾引导分层燃烧,试验
2、边界条件依据分层燃烧的实际缸内条件设定。研究结果表明压电晶体喷油器喷雾形态呈现明显的油线结构,随着喷雾的发展,清晰的油线边界逐渐模糊。喷油压力和环境背压的增加都会使贯穿距曲线中喷雾破碎雾化的拐点提前,有利于燃油的雾化。高环境背压使喷雾形态中产生明显的涡流回旋区,将破碎的小粒径燃油输送到喷雾的上方,使火花塞附近形成易于点燃的混合气。环境温度的升高会导致涡流回旋区在0.4ms时发生坍塌,不利于分层燃烧的实现,因此利用压电晶体喷油器实现喷雾引导分层燃烧时,晚喷的喷油脉宽不宜过长。燃料温度的升高对于前期喷雾形态影响不大,0.6ms之后
3、,高温燃料的喷雾发生明显坍塌,贯穿距和喷雾锥角明显减少。关键词:压电晶体外开式喷油器汽油喷雾贯穿距喷雾锥角阴影法中图分类号:TK413.8+4文献标识码:A文章编号:2095—8234(2015)05—0031—07AStudyonSprayPatternofPiezoOutward-OpeningInjectorforGasolineSongDongxian"2,LiWenbln‘2GengLC,z,JiangXinghong‘2’LaiHaipen91’2.GaoDingweil’21一TechnicalCenter,Gr
4、eatWauMotorCo.Ltd.(Baoding,Hebei,071000,China)2一HebeiAutomobileEngineeringTechnology&ResearchCenterAbstract:Thespraycharacteristicsofgasolinepiezooutward-openinginjectorwasstudiedatdifferentboundaryconditionsinsprayconstantvolumechamberbyshadowmethod.Theboundarycond
5、itionWrit8setaccordingtoactualin-cylinderconditionwithstratifiedcombustion.Theresultsshowthatthesprayconsistsofmanyfuelstringsandthestringbecomesblurasthespraydevelopswithtime.Theincreaseofinjectionpressureandbackpressureadvancesthespraybreakupturningpointonpenetrat
6、iondistancecurve.Thespraystructurewouldproduceswirlregionwhichwouldtransferfuelwithsmalldiametertoupperparttoformrichmixturearoundsparkplug,buttheincreaseofbacktemperatureCandisappeartheswirlregionfrom0.4mswhichisharmfultostratifiedcombustion.Asaresult,whenthepiezoi
7、njectorisusedtorealizespray-guidedstratifiedcombustion,thepulsewidthoflateinjectionshouldbeshorter.Fueltemperaturehaslittleinfluenceonspraypatternatearlierstageandthehi【ghtemperaturefuelwouldoccurmoreobviouscollapseafter0.6mswhichresultsinthedecreaseofspraypenetrati
8、ondistanceandsprayangle.Keywords:Piezooutward-openinginjector,Gasoline,Spraypenetrationdistance,Sprayangle,Shadowmethnfl作者简介:宋东先(1982一),男,
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