| A study of noise reduction by acoustic shock waves |
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| 作者姓名： | ZHU Zhichi HUANG Zhenhua and LU Liu |
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| 摘 要： | I.IntroductionAcousticshockwavcs(ASW)isanimportantphcnomcnoninnonlinearacoustics.Experimentalrcsultshavcshownthatwhenanaircraftcngincinletopcratesneartheson-iccondition,vcrystrongnoisegcncratedbythcfanscanbcreduccdgreat1yowingtothcformationofASWatthcthroatofthcin1etll].ASWisadiscontinuityofacousticvaria-bles,whichisdifTcrcntfromthcshockwavesoccurringinhighspcedsteadyflowinducts.Theformer'sintensityismuch1cssthanthelattcr's.Furthcrmorc,thepositionandintensityofASWisalwayschangedwithtime.l…
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A study of noise reduction by acoustic shock waves |
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| Authors: | ZHU Zhichi HUANG Zhenhua and LU Liu |
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| Institution: | Tsinghua University. Beijing 100080 |
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| Abstract: | Conditions of generation of acoustic shock waves (ASW) and effects of ASW on noise reduction are numerically studied in this paper. Effects of intensity and frequency of noise sources, duct configuration, throat flow Mach number and multifrequeney noise sources on noise reduction by ASW are discussed in detail. Meanwhile, a group or experimental data of additional noise pressure level and fluid pressure loss generated by flow in a converging-diverging duet is presented to explain the realizability or using ASW silencers,since such an additional duct with high speed flow is necessary to reduce noise by ASW, which results in additional flow noise and pressure loss. |
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| Keywords: | Acoustic shock waves Noise control Sound propagation in ducts Numerical aeroacoustics Silencer |
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