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时间:2020-03-27
《液力缓速器全流道式制动流场数值计算方法研究.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、2016年2月机床与液压Feb?2016第44卷第4期MACHINETOOL&HYDRAULICSVol?44No?4DOI:10.3969/j?issn?1001-3881?2016?04?024液力缓速器全流道式制动流场数值计算方法研究123黄俊刚,李长友,文光安(1?广东交通职业技术学院,广东广州510650;2?华南农业大学工程学院,广东广州510642;3?深圳市特尔佳科技股份有限公司,广东深圳518110)摘要:现有关于液力缓速器制动流场数值计算方法的研究均忽略了换热芯子的流阻压降作用,导致计算边界条件设置不准确的问题。为此,基于三维
2、扫描还原的模型重建技术,考虑换热芯子的流阻压降作用,采取全流道式选取方案,选用RNG双方程模型与基于压力的PISO求解算法,运用CFD技术对VOITH公司VR120液力缓速器制动流场进行全流道式数值计算,获得制动力矩与转速特性曲线,并使用流场压力云图对换热芯子的流阻压降作用进行验证分析。结果表明:制动力矩随着转速的升高呈现二次方增长趋势;换热芯子的流阻压降作用显著,是不可忽略的流场边界条件,全流道式数值计算方法是必要的。关键词:液力缓速器;全流道;换热芯子;制动流场;数值计算中图分类号:U463?53文献标志码:A文章编号:1001-3881(2
3、016)4-078-5NumericalComputationMethodofFull⁃runnerBrakingFlowFieldofHydrodynamicRetarder123HUANGJungang,LIChangyou,WENGuang’an(1?GuangdongCommunicationPolytechnic,GuangzhouGuangdong510650,China;2.CollegeofEngineering,SouthChinaAgriculturalUniversity,GuangzhouGuangdong510642,C
4、hina;3?ShenzhenTercaTechnologyCo.,Ltd.,ShenzhenGuangdong518110,China)Abstract:Atpresent,inthecalculationprocessofthebrakingflowfieldofhydraulicretarder,theflow⁃resistanceandvoltage⁃dropeffectsofheatexchangercoreareignored,resultingininaccuratesettingofcalculationboundarycondi
5、tions.Therefore,basedonmodelreconstructiontechniqueofthree⁃dimensionalscanningreduction,bytakingthefull⁃runnerselectionscheme,usingRNGtwo⁃e⁃quationmodelandpressure⁃basedPISOalgorithm,consideringtheflow⁃resistanceandvoltage⁃dropeffectsofheatexchangercore,anoverallnumericalcomp
6、utationwasconductedonthebrakingflowfieldofhydrodynamicretarderVR120fromVOITHbyusingcomputerfluiddynamics(CFD)technique.Thecurvesofbrakingtorqueandspeedcharacteristicswerederived,andverificationanalysiswasconductedonflow⁃resistanceandvoltage⁃dropeffectsoftheheatexchangercorewi
7、thusingofnephogramofflowfieldpressure.There⁃sultsshowthatthebrakingtorquepresentsaquadraticgrowthtrendasthespeedincreases;theheatexchangercorehassignificantflow⁃resistanceandvoltage⁃dropeffects,whichisnon⁃negligibleflowfieldboundaryconditions,andfull⁃runnercomputationmethodis
8、nec⁃essary.Keywords:Hydrodynamicretarder;Full⁃runner;Heatexchangerco
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