分析汽车后视镜区域非定常流场与气动噪声研究

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1、学兔兔www.xuetutu.com第46卷第22期机械工程学报Vl01．46NO．222010年11月JOURNALOFMECHANICALENGINEERINGNOV．2010DoI：1O．3901／JME．2010．22．151汽车后视镜区域非定常流场与气动噪声研究木杨博胡兴军张英朝(吉林大学汽车动态模拟国家重点实验室长春130022)摘要：以表达汽车A柱与侧窗形状特征的楔形体为基础，安装某轻型客车的后视镜，建立能够表达汽车后视镜区域流动特点的几何模型。采用计算流体力学软件Star-CD和稳态那维尔一斯托克斯方法，获得此几何

2、模型的后视镜区域流场特性和气动噪声源项的基本信息，进而采用子域数值模拟方法，获得非定常流动特性和侧窗区域监控点的气动噪声声压级。在风洞试验中采用表面丝带法进行流场町视化，并采用激光粒子测速技术测量后视镜尾流场，验证了流场数值模拟的正确性。在风洞中测量侧窗区域监测点的气动噪声声压级，评估计算流体力学方法对气动噪声的预测能力。与风洞试验对比表明，子域数值模拟方法在保证计算精度的前提下降低了气动噪声数值模拟的计算量，为在汽车开发早期阶段预测气动噪声提供了可行的途径。关键词：汽车空气动力学后视镜定常流场气动噪卢子域数值模拟中图分类号：U4

3、61．1StudyonUnsteadyFlowFieldandAerodynamicNoiseoftheAutomobileRearViewMirrorRegionYANGBoHUXingjunZHANGYingchao(StatekeyLoboratoryofAutomobileDynamicSimulation，JilinUniversity,Changchun130022)Abstract：Thegeometrymodelwhichcanrepresenttheflowcharacteristicsoftheautomobi

4、lerearviewmirroriSbuilt．ThemodeliSawedgebodyfortheinstallationofarearviewmirrorofaminivan．Thewedgebodyrepresentstheshapefeaturesoftheautomobile’SA—pillarandthesidewindow．Theflowfieldaroundthemodelandthebasicaerodynamicnoisesourceterminformationaresimulatedbyusingtheco

5、mputationalfluiddynamicssoftwareStar-CDandthesteadyReynoldsAveragedNavier-Stokes(RANS)method．Theunsteadyflowfieldandsoundpressurelevelsofthemonitoringpointsonthesidewindowarecomputedbyusingasubdomainnumericalsimulationmethod．TheflowfieldsimulationiSverifiedbywindtunne

6、lexperimentsbyusingthesurfacetuffflowvisualizationmethodandtheParticleImageVelocimetrytechnique．Soundpressurelevelsofthemonitoringpointsonthesidewindowaremeasuredinthewindtunne1．Theaerodynamicnoisepredictionusingcomputationalfluiddynamicsmethodisevaluatedbywindtunnele

7、xperimentalresults．Thesubdomainmethodcanreducethecomputationalcostwithoutlosingtheaccuracyaccordingtothecomparisonresults．ThesubdomainnumericalsimulationmethodiSconsideredasafeasiblesolutionforestimatingaerodynamicnoiseattheearlystageofautomobiledevelopment．Keywords：A

8、utomotiveaerodynamicsRearviewmirrorUnsteadyflowfieldAerodynamicnoiseSubdomainnumericalsimulation然而仅提供气动力系数并不能满足现今汽车空气动0前言力学研