Surface Pressure Fluctuations Produced By Boundary Layer Turbulence

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Surface Pressure Fluctuations Produced by Boundary Layer Turbulence

Author : Sheldon Gardner
Publisher :
ISBN 13 :
Total Pages : 33 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Surface Pressure Fluctuations Produced by Boundary Layer Turbulence by : Sheldon Gardner

Download or read book Surface Pressure Fluctuations Produced by Boundary Layer Turbulence written by Sheldon Gardner and published by . This book was released on 1963 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface pressure fluctuations produced by boundary layer turbulence developed above a rigid plane surface are investigated theoretically. For an incompressible flow which obeys the Navier-Stokes equations, the boundary pressure is determined by a volume integration over quadrupole sources. Three different classes of source terms may be identified. These involve second, third, and fourth order velocity correlations. The contribution of the fourth order or turbulence-turbulence terms to the boundary pressure cross spectral density at high frequencies is obtained. The results show that the turbulence-turbulence boundary pressure sources are located at an effective height, and travel with an effective convection speed, both of which depend upon frequency and the shape of the mean velocity profile. At high frequencies, the pressure spectrum is found to be roughly proportional to the sixth power of the free stream velocity, and to the inverse cube of the frequency. Finally, the effect of the finite size of the transducer upon the measured boundary pressure spectrum is discussed. (Author).

Pressure Fluctuations in Turbulent Boundary Layers

Author : M. V. Lowson
Publisher :
ISBN 13 :
Total Pages : 36 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Pressure Fluctuations in Turbulent Boundary Layers by : M. V. Lowson

Download or read book Pressure Fluctuations in Turbulent Boundary Layers written by M. V. Lowson and published by . This book was released on 1965 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Wall Pressure Fluctuations in a Turbulent Boundary Layer

Author : William W. Willmarth
Publisher :
ISBN 13 :
Total Pages : 39 pages
Book Rating : 4.:/5 (249 download)

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Book Synopsis Wall Pressure Fluctuations in a Turbulent Boundary Layer by : William W. Willmarth

Download or read book Wall Pressure Fluctuations in a Turbulent Boundary Layer written by William W. Willmarth and published by . This book was released on 1958 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: When a turbulent boundary layer is produced by air flow past a solid surface, the turbulence in the boundary layer can generate a sound field in the free stream and will also induce fluctuating loads on the solid surface. If the surface is flexible, this motion will generate an additional sound field on both sides of the surface. In an initial investigation of the latter form of sound generation, suitable equipment has been developed to measure the fluctuating wall pressure in the turbulent boundary layer. The equipment includes a specially designed low-noise and low-turbulence-level wind tunnel and a small barium titanate transducer and preamplifier combination for frequencies up to 50 kilocycles. The transducer and preamplifier may be useful for other applications. Using this equipment, some of the properties of the wall pressure fluctuations in a turbulent boundary layer have been measured. It was found that the spectrum of the wall pressure fluctuations extended to 50 kilocycles and that the root-mean-square wall pressure was a constant part (0.0035) of the free stream dynamic pressure for 0.2

On Surface Pressure Fluctuations in Turbulent Boundary Layer

Author : College of Aeronautics (Cranfield, Bedfordshire)
Publisher :
ISBN 13 :
Total Pages : 47 pages
Book Rating : 4.:/5 (32 download)

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Book Synopsis On Surface Pressure Fluctuations in Turbulent Boundary Layer by : College of Aeronautics (Cranfield, Bedfordshire)

Download or read book On Surface Pressure Fluctuations in Turbulent Boundary Layer written by College of Aeronautics (Cranfield, Bedfordshire) and published by . This book was released on 1960 with total page 47 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Bursts and Pressure Fluctuations in Turbulent Boundary Layers

Author : Peter Bradshaw
Publisher :
ISBN 13 :
Total Pages : 52 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis Bursts and Pressure Fluctuations in Turbulent Boundary Layers by : Peter Bradshaw

Download or read book Bursts and Pressure Fluctuations in Turbulent Boundary Layers written by Peter Bradshaw and published by . This book was released on 1986 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface pressure fluctuations below turbulent boundary layers were studied, in part, because they can be regarded as 'footprints' of passing turbulent eddies. The pressure fluctuations are formally described by a Poisson equation, implying that the pressure fluctuation at a given point is mathematically represented by the integral of a 'source' term over the whole flow field, with a weighting inversely proportional to the distance of the source from the given point. In turbulent boundary layers, fluctuations were made in a low-speed constant pressure the high-frequency part of the wall pressure fluctuations is generated mainly within the inner layer - say, the first 20% of the boundary layer thickness - and the low-frequency part is generated mainly in the outer layer. Measurements of velocity and surface-pressure turbulent boundary layer well downstream of an extensive region of wall roughness. The turbulence near the wall was representative of a smooth-wall flow, while that in the outer layer was typical of the upper stream rough-wall flow. Comparison with previous measurements on an entirely smooth wall illustrates the relative contributions of the inner and outer layers to the surface pressure fluctuations. Further work has been done to compare the VITA (Variable ge) conditional-sampling algorithm withuctuations were more advanced algorithms. Keywords: Turbulent boundary layer, Noise measurement, Statistical analysis, Surface roughness, and VITA algorithm.

Computation of the Spectra of Turbulent Boundary Layer Surface- Pressure Fluctuations

Author : John H. Linebarger
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.:/5 (322 download)

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Book Synopsis Computation of the Spectra of Turbulent Boundary Layer Surface- Pressure Fluctuations by : John H. Linebarger

Download or read book Computation of the Spectra of Turbulent Boundary Layer Surface- Pressure Fluctuations written by John H. Linebarger and published by . This book was released on 1972 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:

More on Noise Produced by Boundary-layer Turbulence

Author : Alan Powell
Publisher :
ISBN 13 :
Total Pages : 2 pages
Book Rating : 4.:/5 (227 download)

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Book Synopsis More on Noise Produced by Boundary-layer Turbulence by : Alan Powell

Download or read book More on Noise Produced by Boundary-layer Turbulence written by Alan Powell and published by . This book was released on 1963 with total page 2 pages. Available in PDF, EPUB and Kindle. Book excerpt: The question of possible sound produced by stresses at a rigid surface is again discussed. It has been previously pointed out that these stresses are effective sources, being the reac tion to momentum fluctuations in a contiguous flow and with which the true sound sources are to be associated. There is no error in the orig inal general formalism, and no confusion need exist between hydrodynamic pressure and sound field pressure in the limits of very small sur faces (when net forces are to directly associated with dipole radiation) and of very large plane surfaces (when the surface pressures merely rep resent reflections of the quadrupole flow noise). (Author).

Turbulence Nature and the Inverse Problem

Author : L. N. Pyatnitsky
Publisher : Springer Science & Business Media
ISBN 13 : 9048122511
Total Pages : 197 pages
Book Rating : 4.0/5 (481 download)

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Book Synopsis Turbulence Nature and the Inverse Problem by : L. N. Pyatnitsky

Download or read book Turbulence Nature and the Inverse Problem written by L. N. Pyatnitsky and published by Springer Science & Business Media. This book was released on 2009-03-22 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydrodynamic equations well describe averaged parameters of turbulent steady flows, at least in pipes where boundary conditions can be estimated. The equations might outline the parameters fluctuations as well, if entry conditions at current boundaries were known. This raises, in addition, the more comprehensive problem of the primary perturbation nature, noted by H.A. Lorentz, which still remains unsolved. Generally, any flow steadiness should be supported by pressure waves emitted by some external source, e.g. a piston or a receiver. The wave plane front in channels quickly takes convex configuration owing to Rayleigh's law of diffraction divergence. The Schlieren technique and pressure wave registration were employed to investigate the wave interaction with boundary layer, while reflecting from the channel wall. The reflection induces boundary-layer local separation and following pressure rapid increase within the perturbation zone. It propagates as an acoustic wave packet of spherical shape, bearing oscillations of hydrodynamic parameters. Superposition of such packets forms a spatio-temporal field of oscillations fading as 1/r. This implies a mechanism of the turbulence. Vorticity existing in the boundary layer does not penetrate in itself into potential main stream. But the wave leaving the boundary layer carries away some part of fluid along with frozen-in vorticity. The vorticity eddies form another field of oscillations fading as 1/r2. This implies a second mechanism of turbulence. Thereupon the oscillation spatio-temporal field and its randomization development are easy computed. Also, normal burning transition into detonation is explained, and the turbulence inverse problem is set and solved as applied to plasma channels created by laser Besselian beams.

Some Features of Surface Pressure Fluctuations in Turbulent Boundary Layers with Zero and Favorable Pressure Gradients

Author : Brian E. McGrath
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis Some Features of Surface Pressure Fluctuations in Turbulent Boundary Layers with Zero and Favorable Pressure Gradients by : Brian E. McGrath

Download or read book Some Features of Surface Pressure Fluctuations in Turbulent Boundary Layers with Zero and Favorable Pressure Gradients written by Brian E. McGrath and published by . This book was released on 1987 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Mechanics of Flow-Induced Sound and Vibration V2

Author : William K. Blake
Publisher : Elsevier
ISBN 13 : 0323145752
Total Pages : 569 pages
Book Rating : 4.3/5 (231 download)

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Book Synopsis Mechanics of Flow-Induced Sound and Vibration V2 by : William K. Blake

Download or read book Mechanics of Flow-Induced Sound and Vibration V2 written by William K. Blake and published by Elsevier. This book was released on 2012-12-02 with total page 569 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanics of Flow-Induced Sound and Vibration V2

Mechanics of Flow-Induced Sound and Vibration, Volume 2

Author : William K. Blake
Publisher : Academic Press
ISBN 13 : 0128122900
Total Pages : 696 pages
Book Rating : 4.1/5 (281 download)

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Book Synopsis Mechanics of Flow-Induced Sound and Vibration, Volume 2 by : William K. Blake

Download or read book Mechanics of Flow-Induced Sound and Vibration, Volume 2 written by William K. Blake and published by Academic Press. This book was released on 2017-08-14 with total page 696 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mechanics of Flow-Induced Sound and Vibration, Volume 2: Complex Flow-Structure Interactions, Second Edition, enables readers to fully understand flow-induced vibration and sound, unifying the disciplines of fluid dynamics, structural dynamics, vibration, acoustics, and statistics in order to classify and examine each of the leading sources of vibration and sound induced by various types of fluid motion. Starting from classical theories of aeroacoustics and hydroacoustics, a formalism of integral solutions valid for sources near boundaries is developed and then broadened to address different source types, including hydrodynamically induced cavitation and bubble noise, turbulent wall-pressure fluctuations, pipe and duct systems, lifting surface flow noise and vibration, and noise from rotating machinery. Each chapter is illustrated with comparisons of leading formulas and measured data. Combined with its companion book, Mechanics of Flow-Induced Sound and Vibration, Volume 1: General Concepts and Elementary Sources, the book covers everything an engineer needs to understand flow-induced sound and vibration. This book will be a vital source of information for postgraduate students, engineers and researchers with an interest in aerospace, ships and submarines, offshore structures, construction, and ventilation. Presents every important topic in flow-induced sound and vibration Covers all aspects of the topics addressed, from fundamental theory, to the analytical formulas used in practice Provides the building blocks of computer modeling for flow-induced sound and vibration

Comparison of Surface Pressure Fluctuations in a Turbulent Boundary Layer as Measured on Various Flight Vehicles

Author : A. R. Green
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (593 download)

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Book Synopsis Comparison of Surface Pressure Fluctuations in a Turbulent Boundary Layer as Measured on Various Flight Vehicles by : A. R. Green

Download or read book Comparison of Surface Pressure Fluctuations in a Turbulent Boundary Layer as Measured on Various Flight Vehicles written by A. R. Green and published by . This book was released on 1974 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

Author :
Publisher :
ISBN 13 :
Total Pages : 652 pages
Book Rating : 4.F/5 ( download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992-11 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

The Stochastic Characteristics of Pressure Fluctuations on a Channel Bed Due to the Macroturbulence in a Hydraulic Jump

Author : Frank Roland Schiebe
Publisher :
ISBN 13 :
Total Pages : 368 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis The Stochastic Characteristics of Pressure Fluctuations on a Channel Bed Due to the Macroturbulence in a Hydraulic Jump by : Frank Roland Schiebe

Download or read book The Stochastic Characteristics of Pressure Fluctuations on a Channel Bed Due to the Macroturbulence in a Hydraulic Jump written by Frank Roland Schiebe and published by . This book was released on 1971 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Applied Mechanics Reviews

Author :
Publisher :
ISBN 13 :
Total Pages : 528 pages
Book Rating : 4.:/5 (26 download)

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Book Synopsis Applied Mechanics Reviews by :

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1973 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Proceedings of the Boeing Symposium on Turbulence

Author :
Publisher : CUP Archive
ISBN 13 :
Total Pages : 496 pages
Book Rating : 4./5 ( download)

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Book Synopsis Proceedings of the Boeing Symposium on Turbulence by :

Download or read book Proceedings of the Boeing Symposium on Turbulence written by and published by CUP Archive. This book was released on with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations

Author : Creighton Lane
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (133 download)

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Book Synopsis Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations by : Creighton Lane

Download or read book Measurement of Turbulent Boundary Layer Induced Surface Pressure Fluctuations written by Creighton Lane and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The turbulent boundary layer (TBL) noise generated inside an aircraft can have a detrimental impact on humans. In an effort to better understand TBL physics and measurement techniques, measurements of the fluctuating wall-pressure beneath a TBL have been performed in an anechoic wind tunnel. The measurements were made using an array of pressure microphones provided by Bombardier Aerospace. Analysis of frequency spectra indicated several shortcomings of the array, namely a low saturation limit and electrical issues, however the low speed spectra agree well with the Goody prediction model. Furthermore, an investigation of the relationship between wall-pressure and velocity fluctuations was performed using a pinhole mounted microphone and simultaneous hot-wire boundary layer measurements. This revealed flow interference from the hot-wire apparatus, obscuring the expected relationships and trends. Several areas of improvement have been identified, including higher saturation limit microphones, LDA for velocity measurements, and increasing rigidity of the experimental setup.