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On Surface Pressure Fluctuations In Turbulent Boundary Layer
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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:
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 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 On Surface Pressure Fluctuations in Turbulent Boundary Layers by : G. M. Lilley
Download or read book On Surface Pressure Fluctuations in Turbulent Boundary Layers written by G. M. Lilley and published by . This book was released on 1960 with total page 26 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 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 A Study of Surface Pressure Fluctuations in Hypersonic Turbulent Boundary Layers by : Kizhanatham Raghavachary Raman
Download or read book A Study of Surface Pressure Fluctuations in Hypersonic Turbulent Boundary Layers written by Kizhanatham Raghavachary Raman and published by . This book was released on 1974 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Surface Pressure Fluctuations Near an Axisymmetric Stagnation Point by : Richard D. Marshall
Download or read book Surface Pressure Fluctuations Near an Axisymmetric Stagnation Point written by Richard D. Marshall and published by . This book was released on 1971 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface pressure fluctuations on a circular disk placed normal to a turbulent air stream were investigated. Turbulence intensities of approximately 10% were produced by a coarse grid installed at the test-section entrance. The turbulent field in the neighborhood of the disk was homogeneous and nearly isotropic. Experimental results indicate that existing linear theories which do not consider distortion of the flow fail to predict the nature of surface pressure fluctuations on a bluff body. Only for wavelengths which are large compared to the body do these theories yield satisfactory results. A strong attenuation of the high frequency components occurs as the flow stagnates. This is accompanied by a transfer of energy from short to long wavelengths. The opposite effect is observed as the flow attains a radial direction and approaches the edge of the disk. A neutral wavelength which undergoes little change in energy was observed. Integral scales of surface pressure fluctuations are much larger than the lateral integral scale of the free-stream turbulence. (Author).
Book Synopsis Measurements of the Surface Pressure Fluctuations in a Turbulent Boundary Layer in Air at Supersonic Speeds by : D.J.M. Williams
Download or read book Measurements of the Surface Pressure Fluctuations in a Turbulent Boundary Layer in Air at Supersonic Speeds written by D.J.M. Williams and published by . This book was released on 1960 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 Surface Pressure Fluctuations in a Three-dimensional Shock Wave/turbulent Boundary Layer Interaction by : D. K. M. Tan
Download or read book Surface Pressure Fluctuations in a Three-dimensional Shock Wave/turbulent Boundary Layer Interaction written by D. K. M. Tan and published by . This book was released on 1985 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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:
Book Synopsis Modeling of Turbulent Boundary Layer Surface Pressure Fluctuation Auto and Cross Spectra, Verification and Adjustments Based on Tu-144ll Data by : Nasa Technical Reports Server (Ntrs)
Download or read book Modeling of Turbulent Boundary Layer Surface Pressure Fluctuation Auto and Cross Spectra, Verification and Adjustments Based on Tu-144ll Data written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-07 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: The literature on turbulent boundary layer pressure fluctuations provides several empirical models which were compared to the measured TU-144 data. The Efimtsov model showed the best agreement. Adjustments were made to improve its agreement further, consisting of the addition of a broad band peak in the mid frequencies, and a minor modification to the high frequency rolloff. The adjusted Efimtsov predicted and measured results are compared for both subsonic and supersonic flight conditions. Measurements in the forward and middle portions of the fuselage have better agreement with the model than those from the aft portion. For High Speed Civil Transport supersonic cruise, interior levels predicted by use of this model are expected to increase by 1-3 dB due to the adjustments to the Efimtsov model. The space-time cross-correlations and cross-spectra of the fluctuating surface pressure were also investigated. This analysis is an important ingredient in structural acoustic models of aircraft interior noise. Once again the measured data were compared to the predicted levels from the Efimtsov model.
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.
Book Synopsis Bursts and Pressure Fluctuations in Turbulent Boundary Layers by : P. Bradshaw
Download or read book Bursts and Pressure Fluctuations in Turbulent Boundary Layers written by P. Bradshaw and published by . This book was released on 1983 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt: Development of measurement techniques and acquisition of velocity- and pressure- fluctuation data in low-speed turbulent boundary layers are described. The object was to study the generation of pressure fluctuations by the turbulent eddies and to use the surface pressure fluctuation as a diagnostic tools, thus bringing together new and existing knowledge of the behavior of the outer layer 'large eddies', the inner layer and viscous sublayer, and the surface pressure fluctuations themselves. Data analysis is still in progress.
Book Synopsis An Experimental Investigation of Surface Pressure Fluctuations Beneath Two and Three-dimensional Turbulent Boundary Layers by : Michael C. Goody
Download or read book An Experimental Investigation of Surface Pressure Fluctuations Beneath Two and Three-dimensional Turbulent Boundary Layers written by Michael C. Goody and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
