| Near field acoustic solution of a rotating point source in frequency domain |
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| 作者姓名： | JU Hongbin SHEN Mengyu ZHONG Fangyuan |
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| 摘 要： | I.IntroductionAerodyntalcnoiseofturbomaChinrynotoalythectstheenvironmentbutalsosometimesresultsinstructuredamage.Aeroacoustics,asaintewhsciPlineofacousticsandaerodynamics,isattractingmorandmoreatteDtionandresearch.TherearetwoimportalltcontentsonthenoiseproducingmechAnsmsinaeroacousticproblem.OneisaboutthesourcesofnoiseinturbomachinryGenetallytherearethreetyPesofsources:thickness,forceandturbulencestress,correspondingrespectivelyTomonopole,dipoleandquadruplesourcesThelatertwokindsofsourcesh…
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Near field acoustic solution of a rotating point source in frequency domain |
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| Authors: | JU Hongbin SHEN Mengyu ZHONG Fangyuan |
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| Institution: | JU Hongbin; SHEN Mengyu; ZHONG Fangyuan(Tsinghua Uaiversity Beijng 100084) (Sbanghai Jiaotong University Shanghai 200031) |
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| Abstract: | On the basis of the frequency domain acoustic solation of sources in arbitrary motion, in this paper an approximate acoustic solution of a rotating point source in near field is given, which is the superposition of the well-Known far field solution and three near field modification items on the condition that the rotating radius is acoustically compact compared with the field sound wavelength. Accordingly the near field Green function in free space is obtained. The characteristic directionality of the sound field induced by source rotating is discussed, and the influences of source position, source frequency and rotating frequency are studied in detail. |
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| Keywords: | Aeroacoustics Frequency domain analysis Near sound field analysis |
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