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1、水下航行器水動(dòng)力噪聲分離預(yù)報(bào)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(dòng)力噪聲卻研究較少。該文將水動(dòng)力噪聲分為殼體流噪聲、殼體流激振動(dòng)噪聲、螺旋槳流噪聲和螺旋槳流激振動(dòng)噪聲四類，采用大渦模擬（LES）結(jié)合Lighthill聲類比混合計(jì)算方法，對(duì)水下航行器的水動(dòng)力噪聲進(jìn)行了分離預(yù)報(bào)。首先采用已有文獻(xiàn)數(shù)據(jù)，驗(yàn)證了該混合聲學(xué)計(jì)算方法的有效性。隨后對(duì)水下航行器殼體和螺旋槳三維流場(chǎng)的流噪聲和流激振動(dòng)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(dòng)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(shí)，由殼體
2、激發(fā)的水動(dòng)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(dòng)力噪聲占總噪聲比例逐漸增加；總體水動(dòng)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(dòng)力噪聲；流噪聲；流激振動(dòng)噪聲中圖分類號(hào)：U661文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：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(dòng)力噪聲的數(shù)值模擬對(duì)于航1.引言行器的實(shí)際設(shè)計(jì)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
