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1、水下航行器水動力噪聲分離預(yù)報摘要：近年來，水下航行器的聲隱蔽性受到廣泛關(guān)注，而其水動力噪聲卻研究較少。該文將水動力噪聲分為殼體流噪聲、殼體流激振動噪聲、螺旋槳流噪聲和螺旋槳流激振動噪聲四類，采用大渦模擬（LES）結(jié)合Lighthill聲類比混合計算方法，對水下航行器的水動力噪聲進(jìn)行了分離預(yù)報。首先采用已有文獻(xiàn)數(shù)據(jù)，驗證了該混合聲學(xué)計算方法的有效性。隨后對水下航行器殼體和螺旋槳三維流場的流噪聲和流激振動噪聲進(jìn)行了數(shù)值模擬和分析。結(jié)果表明，四類噪聲均與速度呈非線性關(guān)系。在上游段，螺旋槳流激振動噪聲為主要噪聲；在下游段，殼體流噪聲所占比例最大。在低速時，由殼體
2、激發(fā)的水動力噪聲是主要噪聲；隨著航速的增大，由螺旋槳激發(fā)的水動力噪聲占總噪聲比例逐漸增加；總體水動力噪聲能量隨航速增大而增大。關(guān)鍵詞：水下航行器；大渦模擬；Lighthill聲類比；水動力噪聲；流噪聲；流激振動噪聲中圖分類號：U661文獻(xiàn)標(biāo)識碼：A文章編號：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較少，水下航行器水動力噪聲的數(shù)值模擬對于航1.引言行器的實際設(shè)計有著十分重要的意義。水下航行器在海洋資源開發(fā)等方面起著日眾所
8、周知，大渦模擬（LargeEddy益顯著的重要作用，作為重要性能指標(biāo)，水下航Si
