水下航行器水动力噪声分离预报

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1、水下航行器水动力噪声分离预报摘要：近年来，水下航行器的声隐蔽性受到广泛关注，而其水动力噪声却研究较少。该文将水动力噪声分为壳体流噪声、壳体流激振动噪声、螺旋桨流噪声和螺旋桨流激振动噪声四类，采用大涡模拟（LES）结合Lighthill声类比混合计算方法，对水下航行器的水动力噪声进行了分离预报。首先采用已有文献数据，验证了该混合声学计算方法的有效性。随后对水下航行器壳体和螺旋桨三维流场的流噪声和流激振动噪声进行了数值模拟和分析。结果表明，四类噪声均与速度呈非线性关系。在上游段，螺旋桨流激振动噪声为主要噪声；在下游段，壳体流噪声所占比例最大。在低速时，由壳体

2、激发的水动力噪声是主要噪声；随着航速的增大，由螺旋桨激发的水动力噪声占总噪声比例逐渐增加；总体水动力噪声能量随航速增大而增大。关键词：水下航行器；大涡模拟；Lighthill声类比；水动力噪声；流噪声；流激振动噪声中图分类号：U661文献标识码：A文章编号：1673-3185(2014)0X-XX-XXSeparatingPredictionofHydrodynamicNoiseofanUnderwaterVehicleAbstract：Inrecentyears,soundconcealment,asoneoftheimportantindexsofu

3、nderwatervehicle’soperationalperationalperformance,hasreceivedwidespreadattention.However,thehydrodynamicnoiseofunderwatervehiclehasbeenalonglackofstudies.Inthispaper,hydrodynamicnoiseisclassifiedintotheflow-inducednoiseoftheshell,thenoiseofflowexcited-vibrationoftheshell,theflow

4、induced-noiseofthepropellerandthenoiseofflowexcited-vibrationofthepropeller,bothofwhicharepredictedbyusingtheLargeEddySimulationandtheLighthill’sacousticanalogymethod.Firstly,effectivenessofthesehybridacousticsimulationmethodsisverifiedbytheexsitingdata.Then,simulationsoffourclas

5、sificationsofthehydrodynamicnoiseofanunderwatervehiclearemade.Finally,analysesoffourclassificationsofthehydrodynamicnoisearerespectivelymadebysoundpowerlevel,soundpressurlevelcontoursandtotalsoundpressurelevels.Itshowsthattherelationsbetweenfourclassificationsofthehydrodynamicnoi

6、sesinducedbytheshellandthepropellersandthespeedbotharenon-linear.And,majornoiseintheupstreamisnoisefromtheflow-inducedvibrationofpropellerwhileoneinthedownstreamistheflow-inducednoiseofshell.Besides,thehydrodynamicnoiseinducedbytheshellisthemajornoiseatlowspeed,andthehydrodynamic

7、noiseinducedbythepropellerswilldominatethewholenoisewiththeincreaseofspeed.Keywords：underwatervehicle;LargeEddySimulation;Lighthill’sacousticanalogy;hydrodynamicnoise;flow-inducednoise;noisefromtheflow-inducedvibration较少，水下航行器水动力噪声的数值模拟对于航1.引言行器的实际设计有着十分重要的意义。水下航行器在海洋资源开发等方面起着日众所

8、周知，大涡模拟（LargeEddy益显著的重要作用，作为重要性能指标，水下航Si