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Prediction Of Boundary Layer Pressure Fluctuations
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Book Synopsis Prediction of Boundary Layer Pressure Fluctuations by : Martin V. Lowson
Download or read book Prediction of Boundary Layer Pressure Fluctuations written by Martin V. Lowson and published by . This book was released on 1968 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: The pressure fluctuations beneath equilibrium boundary layers at subsonic and supersonic speeds are reviewed. Empirical formulae are presented for the intensity, spectra, and cross spectra of the fluctuations. The formulae are intended for direct use in structural response calculations. A simple theoretical model to predict intensities at supersonic speeds is put forward, and the effects of nonequilibrium boundary layers are discussed in general terms. An appendix gives theoretical justification for negative exponential correlation curves at large spacings. (Author).
Book Synopsis Predicting Turbulent Boundary Layer Wall Pressure Fluctuations in Adverse Pressure Gradients by : Frank J. Aldrich
Download or read book Predicting Turbulent Boundary Layer Wall Pressure Fluctuations in Adverse Pressure Gradients written by Frank J. Aldrich and published by . This book was released on 2005 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of the Pressure Fluctuations Associated with Maneuvering Reentry Weapons by : Anthony L. Laganelli
Download or read book Prediction of the Pressure Fluctuations Associated with Maneuvering Reentry Weapons written by Anthony L. Laganelli and published by . This book was released on 1984 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted at the AEDC von Karman facility, Tunnels A and B, in which acoustic pressure fluctuation data were acquired on a 7 degree half-cone-angle model featuring a control surface. The objective was to define the aeroacoustic environment applicable to re-entry vibration response analysis for both ballistic and maneuvering vehicles. Wind tunnel measurements were obtained at Mach 4 and 8 for several values of freestream Reynolds number and model angle of attack. Stationary zones of laminar, transitional, and turbulent flow over the model were achieved. Acoustic data were reduced to rms fluctuating pressure, and power and cross-power spectral densities. Results were normalized using local boundary layer parameters for comparison with previous high speed measurements. The present study re-examined the aeroacoustic environment prediction capability relative to compressible flow conditions. Moreover, boundary layer characteristic lengths and velocities were reviewed in order to develop normalization procedures required for development of appropriate aeroacoustic scaling laws. It was determined that fluctuating pressure characteristics described by incompressible theory as well as empirical correlations could be modified to a compressible state through a transformation function. In this manner, compressible data were transformed to the incompressible plane where direct use of more tractable prediction techniques are available for engineering design analyses.
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:
Book Synopsis Prediction of Fluctuating Pressure in Attached and Separated Turbulent Boundary Layer Flow by : A.L. Laganelli
Download or read book Prediction of Fluctuating Pressure in Attached and Separated Turbulent Boundary Layer Flow written by A.L. Laganelli and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Prediction of Fluctuating Pressure Loads Produced by Shock-induced Turbulent Boundary Layer Separation by : J. W. Barter
Download or read book Prediction of Fluctuating Pressure Loads Produced by Shock-induced Turbulent Boundary Layer Separation written by J. W. Barter and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluctuating Pressure Loads Under High Speed Boundary Layers by :
Download or read book Fluctuating Pressure Loads Under High Speed Boundary Layers written by and published by . This book was released on 1987 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Mehod for the Prediction of the Effects of Free-stream Disturbances on Boundary-layer Transition by : J. A. Benek
Download or read book A Mehod for the Prediction of the Effects of Free-stream Disturbances on Boundary-layer Transition written by J. A. Benek and published by . This book was released on 1973 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: A semiempirical expression for boundary-layer transition location is developed based on the concept of a critical ratio of inertial to viscous shearing stresses at laminar breakdown. Extensive comparisons between predicted and measured transition locations on a 10-deg included-angle cone at transonic speeds are shown with the data predicted to within 10%. Comparisons are also made with low subsonic and supersonic data which indicate the method is extendible to these flow regimes. (Author).
Book Synopsis Method for Predicting Compressible Turbulent Boundary Layers in Adverse Pressure Gradients by : Shimer Zane Pinckney
Download or read book Method for Predicting Compressible Turbulent Boundary Layers in Adverse Pressure Gradients written by Shimer Zane Pinckney and published by . This book was released on 1971 with total page 68 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 A Root-mean-square Pressure Fluctuations Model for Internal Flow Applications by : Yu Shu Chen
Download or read book A Root-mean-square Pressure Fluctuations Model for Internal Flow Applications written by Yu Shu Chen and published by . This book was released on 1985 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Surface Pressure Fluctuations in a Separating Turbulent Boundary Layer by :
Download or read book An Experimental Study of Surface Pressure Fluctuations in a Separating Turbulent Boundary Layer written by and published by . This book was released on 1987 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pressure Fluctuations in the Turbulent Boundary Layer by : Sina Ghaemi
Download or read book Pressure Fluctuations in the Turbulent Boundary Layer written by Sina Ghaemi and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Pressure fluctuations in a turbulent boundary layer by : D. R. Lane-Smith
Download or read book Pressure fluctuations in a turbulent boundary layer written by D. R. Lane-Smith and published by . This book was released on 1959 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Book Synopsis Prediction of Pressure Fuctuations Associated with Maneuvering Re-entry Weapons by : Anthony L. Laganelli
Download or read book Prediction of Pressure Fuctuations Associated with Maneuvering Re-entry Weapons written by Anthony L. Laganelli and published by . This book was released on 1977 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental program was conducted at the AEDC vonKarman facility, Tunnels A and B, in which acoustic pressure fluctuation data were acquired on a 7 degree half-cone-angle model featuring a control surface. The objective was to define the aeroacoustic environment applicable to re-entry vibration response analysis for both ballistic and maneuvering vehicles. Wind tunnel measurements were obtained at Mach 4 and 8 for several values of freestream Reynolds number and model angle of attack. Stationary zones of laminar, transitional, and turbulent flow over the model were achieved. Acoustic data were reduced to rms fluctuating pressure, and power and cross-power spectral densities. Results were normalized using local boundary layer parameters for comparison with previous high speed measurements. The present study re-examined the aeroacoustic environment prediction capability relative to compressible flow conditions. Moreover, boundary layer characteristic lengths and velocities were reviewed in order to develop normalization procedures required for development of appropriate aeroacoustic scaling laws. It was determined that fluctuating pressure characteristics described by incompressible theory as well as empirical correlations could be modified to a compressible state through a transformation function. In this manner, compressible data were transformed to the incompressible plane where direct use of more tractable prediction techniques are available for engineering design analyses.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724680730 Total Pages :32 pages Book Rating :4.6/5 (87 download)
Book Synopsis Prediction of Compliant Wall Drag Reduction by : National Aeronautics and Space Administration (NASA)
Download or read book Prediction of Compliant Wall Drag Reduction written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-06 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A numerical model of turbulent boundary layer flows over compliant walls was investigated. The model is based on Burton's observation that outer flow structures in turbulent boundary layers produce large scale pressure fluctuations near the wall. The results of calculations indicate that certain small wavelength wall motions can have a significant effect upon the stability of turbulent boundary layers. Orszag, S. A. Unspecified Center NASA-CR-3071 NAS1-14906
