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Temporal And Spectral Features Of Wall Pressure Fluctuations Beneath A Turbulent Boundary Layer
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Book Synopsis Temporal and Spectral Features of Wall Pressure Fluctuations Beneath a Turbulent Boundary Layer by : Carolyn Ceder Karangelen
Download or read book Temporal and Spectral Features of Wall Pressure Fluctuations Beneath a Turbulent Boundary Layer written by Carolyn Ceder Karangelen and published by . This book was released on 1991 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Wave Number Frequency Spectrum of the Wall Pressure Fluctuations Beneath a Turbulent Boundary Layer by : Eric Manoha
Download or read book The Wave Number Frequency Spectrum of the Wall Pressure Fluctuations Beneath a Turbulent Boundary Layer written by Eric Manoha and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer by : John S. Serafini
Download or read book Wall-pressure Fluctuations and Pressure-velocity Correlations in a Turbulent Boundary Layer written by John S. Serafini and published by . This book was released on 1963 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experimental study was carried out at a free-stream Mach number of 0.6 and a Reynolds number per foot of 3.45 x 106. The magnitudes of the wall-pressure fluctuations agree with the Lilley-Hodgson theoretical results. Space-time correlations of the wall-pressure fluctuations generally agree with Willmarth's results for longitudinal separation distances. The convection velocity of the fluctuations is found to increase with increasing separation distances, and its significance is explained. Measurements with the longitudinal component of the velocity fluctuations indicate that the contributions to the wall-pressure fluctuations are from two regions, an inner region near the wall and an outer region linked with the intermittency.
Book Synopsis WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER by : CHI-SHENG YANG, WILLIAM W. WILLMARTH
Download or read book WALL PRESSURE FLUCTUATIONS BENEATH AN AXIALLY SUMMERTRIC TURBULEN BOUNDARY LAYER ON A CYLINDER written by CHI-SHENG YANG, WILLIAM W. WILLMARTH and published by . This book was released on 1969 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurements of the Fluctuating Pressure at the Wall Beneath a Thick Turbulent Boundary Layer by : W. W. Willmarth, C. E. Wooldridge
Download or read book Measurements of the Fluctuating Pressure at the Wall Beneath a Thick Turbulent Boundary Layer written by W. W. Willmarth, C. E. Wooldridge and published by . This book was released on 1962 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Wall Pressure Fluctuations Beneath an Axially Symmetric Turbulent Boundary Layer on a Cylinder by : Chi-Sheng Yang
Download or read book Wall Pressure Fluctuations Beneath an Axially Symmetric Turbulent Boundary Layer on a Cylinder written by Chi-Sheng Yang and published by . This book was released on 1969 with total page 101 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the turbulent pressure field on the outer surface of a 3 inch diameter cylinder were made at a point 24 feet downstream of the origin of the turbulent boundary layer. The root-mean square wall pressure was 2.42 times the wall shear stress. The normalized power spectrum at high frequencies contained twice the energy density of the spectrum beneath a plane boundary layer. The convection speed was the same as that in a plane boundary layer but the eddy size was smaller by a factor of two. The smaller eddy size and unchanged convection speed account for the greater energy in the spectrum at high frequencies. (Author).
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 1994 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Low-Wavenumber Wall Pressure Fluctuations Due to Boundary-Layer Transition by :
Download or read book Low-Wavenumber Wall Pressure Fluctuations Due to Boundary-Layer Transition written by and published by . This book was released on 2000 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boundary layer transition is an important contributor to sensor flow-induced self noise. The pressure fluctuations caused by this spatially bounded and intermittent, phenomenon encompass a very wide range of spatial wave numbers and temporal frequencies. Here, we analyze the wavevector-frequency spectrum of the wall pressure fluctuations due to subsonic boundary-layer transition as it occurs on a flat plate under zero pressure gradient conditions. Based on previous measurements of the statistic of the boundary-layer intermittence it is found that transition induces higher low-streamwise wave number wall pressure level than does a fully-developed turbulent boundary layer (TBL) that might superficially exist at the same location and at the same Reynolds number. The transition zone spanwise wavenunmber pressure components are virtually unchanged from the TBL ease. The results suggest that transition may be more effective than the TBL in forcing structural excitation at low Mach numbers and it may have a more intense radiated noise contribution on a per unit area basis. This may help explain increases in measured sensor self noise when the sensors are placed near the transition zone.
Book Synopsis Interpretation of Wall Pressure Measurements Under a Turbulent Boundary Layer by : K. L. Chandiramani
Download or read book Interpretation of Wall Pressure Measurements Under a Turbulent Boundary Layer written by K. L. Chandiramani and published by . This book was released on 1965 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report deals with some aspects of the correlations and the spectra of the fluctuating wall pressure. Some of the available experimental data on the pressure fluctuations is reviewed and different correlation models for the fluctuating pressure are investigated chiefly from the point of view of estimation of transducer corrections and of power input to an infinite plate. It was demonstrated that both these aspects are rather sensitive to the kind of correlation model assumed.
Book Synopsis Turbulent Wall-Pressure Fluctuations: New Model for Off-Axis Cross-Spectral Density by :
Download or read book Turbulent Wall-Pressure Fluctuations: New Model for Off-Axis Cross-Spectral Density written by and published by . This book was released on 1996 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Some Measurements of Longitudinal Space-time Correlations of Wall Pressure Fluctuations in Turbulent Pipe Flow by : William Anton Von Winkle
Download or read book Some Measurements of Longitudinal Space-time Correlations of Wall Pressure Fluctuations in Turbulent Pipe Flow written by William Anton Von Winkle and published by . This book was released on 1961 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements made on some of the characteristics of the turbulent pressure field at the wall of a cylindrical pipe yielded root-mean-square pressure levels, power spectra, longitudinal space-time correlations, and convection velocity over a limited range of Reynolds number. The root-mean-square pressure levels were proportional to the dynamic pressure and when nondimensionalized by use of the dynamic pressure were observed to be independent of the Reynolds number and approximately equal to 0.008 over the Reynolds number range examined. The measurements indicate the existence of an apparent downstrea c nvection of the pressure field at a rate which is approximately the mean discharge velocity of the pipe flow. The pressure field in addition to being convected was also dispersed. Estimates of the scale of the turbulence were obtained. A limited statistical analysis of the pressure time history indicates that the amplitude variation is Gaussian. (Author).
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
Book Synopsis Fluctuating Pressures Measured Beneath a High-temperature, Turbulent Boundary Layer on a Flat Plate at Mach Number of 5 by : Tony L. Parrott
Download or read book Fluctuating Pressures Measured Beneath a High-temperature, Turbulent Boundary Layer on a Flat Plate at Mach Number of 5 written by Tony L. Parrott and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Calculation of Turbulent Boundary Layer Wall Pressure Spectra by :
Download or read book Calculation of Turbulent Boundary Layer Wall Pressure Spectra written by and published by . This book was released on 1993 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study is an investigation into the suitability of various wavevector-frequency models of turbulent boundary layer wall pressure fluctuations for the prediction of experimental measurements of turbulent boundary layer wall pressure spectra. Three separate models of the wavevector- frequency spectrum proposed by D.M. Chase in 1980 and 1987 are evaluated. The wavevector-frequency spectral models are integrated numerically using a formulation for the point wall pressure spectrum (based on the work of Uberoi and Kovasznay). The representation of the wall pressure spectrum used accounts for the effect of a finite sized transducer on the measured wall pressure spectrum. By accounting for the area averaging effect of finite sized transducers on the measured turbulent boundary layer wall pressure spectra, it was possible to use Chase's rigorous formulations for the wavevector-frequency spectrum instead of the point pressure spectrum representations which assume an infinitely small measurement sensor. Results from the numerical integrations are compared to recent experimental data to determine which model of the wavevector- frequency spectrum most accurately predicts measured turbulent boundary layer wall pressure spectra. Data from experiments using fluids with a wide range of physical properties (air, water, and glycerine) are used for comparison purposes. Using the selected model, new empirical constants are established for use in the model for each fluid under consideration. Justification for use of the new empirical constants is given, and current limitations of the wavevector- frequency models are discussed.
Book Synopsis Random Response of Rectangular Panels to the Pressure Field Beneath a Turbulent Boundary Layer in Subsonic Flows by : Wei Jao Chyu
Download or read book Random Response of Rectangular Panels to the Pressure Field Beneath a Turbulent Boundary Layer in Subsonic Flows written by Wei Jao Chyu and published by . This book was released on 1972 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt: The response of a rectangular panel under the excitation of a turbulent boundary layer with a zero longitudinal mean pressure gradient in a subsonic flow was studied in detail. The method of normal mode was used together with the technique of spectral analysis. Both simply supported and clamped edge conditions of a panel were considered, and the displacement power spectral density of the panel response was computed. The results for the clamped edge panel compare favorably with existing data. Charts of structural acceptance, which provide a framework for estimating the response of other rectangular panels, are presented, and the physical significances of structural acceptances discussed.
Book Synopsis Turbulent Boundary Layer Wall-Pressure Fluctuations on an Axisymmetric Body by : H. V. L. Patrick
Download or read book Turbulent Boundary Layer Wall-Pressure Fluctuations on an Axisymmetric Body written by H. V. L. Patrick and published by . This book was released on 1977 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt: A buoyancy propelled, fin-stabilized vehicle with a favorable pressure gradient over a major portion of its length was tested at Lake Pend Oreille, Idaho. Turbulent boundary layer wall-pressure fluctuations were measured at numerous locations of the body. In the region of favorable pressure gradient, the normalized wall-pressure spectral density was found to be similar to that on a flat plate. Transition from laminar to turbulent boundary layer flow occurred on the 30-inch-maximum diameter vehicle at transition-length Reynolds numbers as large as 9.2 million. (Author).
