{"title":"紊流弱热射流上的声音散射","authors":"A. Petrossian, J. Pinton","doi":"10.1051/JP2:1997152","DOIUrl":null,"url":null,"abstract":"We report an experimental study of the scattering of ultrasonic plane waves on a turbulent jet in air (Pr = 0.7). The jet is weakly heated so that the temperature fluctuations act as a passive scalar. In the backscattering geometry one measures the Fourier components of the temperature field T(q,t). The time averaged characteristics are analyzed in detail; in particular we observe a Kolmogorov -5/3 power law behavior for the passive scalar spectrum in the inertial range of scales. The study of the time fluctuations shows that the histograms of T(q,t) remain close to a Gaussian at all scales.","PeriodicalId":14774,"journal":{"name":"Journal De Physique Ii","volume":"43 1","pages":"801-812"},"PeriodicalIF":0.0000,"publicationDate":"1997-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"15","resultStr":"{\"title\":\"Sound Scattering on a Turbulent, Weakly Heated Jet\",\"authors\":\"A. Petrossian, J. Pinton\",\"doi\":\"10.1051/JP2:1997152\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"We report an experimental study of the scattering of ultrasonic plane waves on a turbulent jet in air (Pr = 0.7). The jet is weakly heated so that the temperature fluctuations act as a passive scalar. In the backscattering geometry one measures the Fourier components of the temperature field T(q,t). The time averaged characteristics are analyzed in detail; in particular we observe a Kolmogorov -5/3 power law behavior for the passive scalar spectrum in the inertial range of scales. The study of the time fluctuations shows that the histograms of T(q,t) remain close to a Gaussian at all scales.\",\"PeriodicalId\":14774,\"journal\":{\"name\":\"Journal De Physique Ii\",\"volume\":\"43 1\",\"pages\":\"801-812\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1997-05-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"15\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal De Physique Ii\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.1051/JP2:1997152\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal De Physique Ii","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1051/JP2:1997152","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Sound Scattering on a Turbulent, Weakly Heated Jet
We report an experimental study of the scattering of ultrasonic plane waves on a turbulent jet in air (Pr = 0.7). The jet is weakly heated so that the temperature fluctuations act as a passive scalar. In the backscattering geometry one measures the Fourier components of the temperature field T(q,t). The time averaged characteristics are analyzed in detail; in particular we observe a Kolmogorov -5/3 power law behavior for the passive scalar spectrum in the inertial range of scales. The study of the time fluctuations shows that the histograms of T(q,t) remain close to a Gaussian at all scales.
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