{"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}
引用次数: 15
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.
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