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时间:2020-03-27
《纳米流体强化活塞组-气缸套传热的数值模拟研究.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32卷第6期内燃机工程V01.32No.62011年12月ChineseInternalCombustionEngineEngineeringDecember.2011文章编号:1000--0925(2011)06一0074一07320102纳米流体强化活塞组一气缸套传热的数值模拟研究周龙1’2,白敏丽1,吕继组1,刘佳伟1,徐哲1(1.大连理工大学能源与动力学院,大连116023;2.河南理工大学机械与动力工程学院。焦作454000)NumericalSimulationonEnhancementofPistonSet_CylinderLinerHeatTransferbyA
2、pplyingNanofluidsZHOULon91一,BAIMin-lil,LOJi—ZUl,LIUJia-weil,XUZhel(1.SchoolofEnergyandPowerEngineering,DalianUniversityofTechnology,Dalian116023,China;2.SchoolofMechanicalandPowerEngineering,HenanPolytechnicUniversity,Jiaozuo454000,China)Abstract:Consideredthepistonset—cylinderlinerasacoupled
3、component,usingnumericalsimulationmethod,theeffectswerestudiedaddingwithnanolevelparticulateofCuinlubeoilandcoolingwatersepa—ratelyforenhancingpistonset—cylinderlinerheattransferandcomparedwiththeoriginalengine.ThenumericalresultsshowthatbothCu—-oilandCu-waternanofluidscanevidentlyenhancepist
4、onset--linerheattransfercapability,andtheenhancementbecomesincreasingwhileincreasingtheconcentrationofnano—parti—cles.Forthepiston,theenhancementofheattransferbyapplyingCu—oilnanofluidisgreaterthanapplyingCu—waternanofluid.Thetemperaturesatbowlcenterpointaandsquishlippointb,pistontopouteredge
5、pointC,andfirstpistonringupperedgepointdareaveragelydecreasedabout28.4,21.7,22.8and27.7Krespectively,whenusing5%(volumetricconcentration)Cu—oilnanofluid.Fortheliner,onlyapplyingCu—waternanofluidexhibitsthebestcapabilityofenhancingheattransferandthetemperatureoftheupperedgepointeoflinercylinde
6、rholeisaveragelyreducedabout10.4Kwhenusing5%(volumetricconcentration)CU—waternanoflUid.摘要:将活塞组一气缸套作为一个耦合体,利用数值模拟法研究了只在润滑油中与只在冷却水中加入纳米Cu颗粒两种情况下的强化传热效果,并与原机传热情况进行比较。研究结果表明:无论是以Cu一润滑油纳米流体还是以Cu-水纳米流体作为传热工质,都可以显著提高活塞组一气缸套的散热性能,且散热量随着纳米粒子浓度的增高而增大。对于活塞侧,Cu一润滑油纳米流体的改善效果强于Cu-水纳米流体,其中Cu体积分数为5%的Cu一润滑油纳米
7、流体可使燃烧室中心点a、燃烧室喉口点b、顶面外边缘点C和第一环外侧上边缘点d的温度平均降低约28.4、21.7、22.8和27.7K;对于气缸套侧,Cu-水纳米流体强化换热效果更理想,Cu体积分数为5%的Cu一水纳米流体可使气缸套内侧上边缘点e的温度平均降低约10.4K。关键词:内燃机;纳米流体;活塞组;气缸套;传热;耦合Keywords:ICengine;nanofluid;pistonset;cylinderliner;heattransfer;coupling中图分类号:T
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