Acoustic radiation of a turbulent boundary layer formed above a flat smooth boundary

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Дәйексөз келтіру

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Рұқсат жабық Тек жазылушылар үшін

Аннотация

A consistent theory of sound generation in a turbulent boundary layer developing over a flat smooth boundary at low Mach numbers is presented. The main source of sound and the long-wave part of pressure pulsations on the boundary in a streamline are incoming shear (viscous) waves generated by Lighthill quadrupoles in the near-wall region of the turbulent boundary layer. It is shown that with an increase in the Reynolds number (decrease in viscosity), the role of viscosity in sound generation does not decrease, but increases. Quantitative estimates of the spectrum of specific sound power generated in a turbulent boundary layer are given.

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Авторлар туралы

I. Belyaev

FAU TsAGI, Moscow Research Complex TsAGI

Email: vkopiev@mktsagi.ru
Ресей, 105005, st. Radio 17, Moscow

V. Kopyev

FAU TsAGI, Moscow Research Complex TsAGI

Хат алмасуға жауапты Автор.
Email: vkopiev@mktsagi.ru
Ресей, 105005, st. Radio 17, Moscow

M. Mironov

FAU TsAGI, Moscow Research Complex TsAGI

Email: mironov_ma@mail.ru
Ресей, 105005, st. Radio 17, Moscow

Әдебиет тізімі

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2. Fig. 1. Sound generation during reflection of a shear wave from a flat boundary (inverse Konstantinov effect) [18].

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3. Рис. 2. Генерация сдвиговой волны при отражении от плоскости звуковой волны (прямой эффект Константинова) [18].

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4. Fig. 3. Sources of the velocity field in the TPS: 1 – Lighthill quadrupoles, 2 – normal surface dipoles, 3 – tangential surface dipoles.

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5. Fig. 4. Coordinate system, pressure field and velocity field projections.

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6. Fig. 5. Energy spectrum of shear stresses based on numerical simulation [40].

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7. Fig. 6. Comparison of the results of the theoretical model and numerical calculation [40]: dotted line – numerical experiment, red curve – theory.

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8. Fig. 7. Theoretical spectrum of shear stresses with normalization to internal scales.

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9. Fig. 8. Examples of the spectrum of the radiated power level: 1 – , 2 – .

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10. Fig. 9. Dependence of the level of radiated power from a unit area on the speed.

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