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Random focusing of nonlinear acoustic N-waves in fully developed turbulence: Laboratory scale experimentстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Averiyanov Mikhail, Ollivier Sebastien, Khokhlova Vera, Blanc-Benon Philippe
- Журнал: Journal of the Acoustical Society of America
- Том: 130
- Номер: 6
- Год издания: 2011
- Издательство: Acoustical Society of America
- Местоположение издательства: United States
- Первая страница: 3595
- Последняя страница: 3607
- DOI: 10.1121/1.3652869
- Аннотация: A laboratory experiment was conducted to study the propagation of short duration (25 mu s) and high amplitude (1000 a) acoustic N-waves in turbulent flow. Turbulent flows with a root-mean-square value of the fluctuating velocity up to 4 m/s were generated using a bidimensional nozzle (140 x 1600 mm(2)). Energy spectra of velocity fluctuations were measured and found in good agreement with the modified von Karman spectrum for fully developed turbulence. Spherical N-waves were generated by an electric spark source. Distorted waves were measured by four 3 mm diameter microphones placed beyond the turbulent jet. The presence of turbulence resulted in random focusing of the pulse; more than a threefold increase of peak pressures was occasionally observed. Statistics of the acoustic field parameters were evaluated as functions of the propagation distance and the level of turbulence fluctuations. It is shown that random inhomogeneities decrease the mean peak positive pressure up to 30% at 2 m from the source, double the mean rise time, and cause the arrival time about 0.3% earlier than that for corresponding conditions in still air. Probability distributions of the pressure amplitude possess autosimilarity properties with respect to the level of turbulence fluctuations. (C) 2011 Acoustical Society of America. [DOT: 10.1121/1.3652869]
- Добавил в систему: Хохлова Вера Александровна
Прикрепленные файлы
| № | Имя | Описание | Имя файла | Размер | Добавлен |
|---|---|---|---|---|---|
| 1. | AveriyanovJASA2011.pdf | AveriyanovJASA2011.pdf | 2,1 МБ | 2 апреля 2015 [va.khokhlova] |