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Preliminary Experimental Investigation Of Effect Of Free Stream Turbulence On Turbulent Boundary Layer Growth
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Book Synopsis Preliminary Experimental Investigation of Effect of Free-stream Turbulence on Turbulent Boundary-layer Growth by : S. J. Kline
Download or read book Preliminary Experimental Investigation of Effect of Free-stream Turbulence on Turbulent Boundary-layer Growth written by S. J. Kline and published by . This book was released on 1960 with total page 70 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Preliminary Experimental Investigation of Effect of Free-stream Turbulence on Turbulent Boundary-layer Growth by : S. J. Kline
Download or read book Preliminary Experimental Investigation of Effect of Free-stream Turbulence on Turbulent Boundary-layer Growth written by S. J. Kline and published by . This book was released on 1960 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Effect of Free Stream Turbulence on the Turbulent Boundary Layer Growth by : Alexander Vladimir Lisin
Download or read book An Experimental Investigation of the Effect of Free Stream Turbulence on the Turbulent Boundary Layer Growth written by Alexander Vladimir Lisin and published by . This book was released on 1958 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Experimental Investigation of the Effect of Free Stream Turbulence on the Turbulent Boundary Layer Growth by : Stanford University. Thermosciences Division
Download or read book Experimental Investigation of the Effect of Free Stream Turbulence on the Turbulent Boundary Layer Growth written by Stanford University. Thermosciences Division and published by . This book was released on 1958 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book NASA Technical Note written by and published by . This book was released on 1960 with total page 412 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects by : Edgar Orsi Filho
Download or read book An Experimental Study of Turbulent Boundary Layers Subjected to High Free-stream Turbulence Effects written by Edgar Orsi Filho and published by . This book was released on 2005 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis was on nominally two-dimensional turbulent boundary layers at zero pressure gradient subjected to high free-stream turbulent intensities of up to 7.9% in preparations for high free-stream turbulence studies on three-dimensional boundary layers, which will be done in the future in the Aerospace and Ocean Engineering Boundary Layer Wind Tunnel at Virginia Tech. The two-dimensional turbulent flow that will impinge three-dimensional bodies needed to be characterized, before the three-dimensional studies can be made. An active turbulence generator designed to create high free-stream turbulence intensities in the wind tunnel was tested and modified in order to obtain the lowest possible mean flow non-uniformities. A seven-hole pressure probe was used to obtain planes of mean velocity measurements. A three-component state of the art laser-Doppler velocimeter (LDV) was used to obtain mean and fluctuating velocities. Previous high free-stream turbulence studies have been reviewed and are discussed, and some of the previously published data of other authors have been corrected. Based on the measurements obtained with the LDV, it was also determined that the semi-log law of the wall is valid for high free-stream turbulence cases, but with different constants than the ones proposed by Coles, where the constants for the high free-stream cases may be dependent on the turbulence intensity. For the first time, the skin friction coefficient (Cf) was deduced from the viscous sublayer. The difference between the U_tau obtained in the viscous sublayer mean velocity profile and the U_tau obtained in the semi-log layer was 1.5%. The skin friction coefficient was determined to increase by 10.5% when the two-dimensional turbulent boundary layer was subjected to high free-stream turbulence effects. Spectral data obtained with the LDV, were compared to the von Kármán model spectrum and to the Pope's model spectrum, where the von Kármán spectrum was proven to fit the spectral data slightly better than the Pope's spectrum. Finally, the Hancock-Bradshaw-Blair parameter obtained for this experiment agreed very well with previously published data.
Book Synopsis The Effects of Free-Stream Turbulence on the Turbulence Structure and Heat Transfer in Zero Pressure Gradient Boundary Layers by : M. F. Blair
Download or read book The Effects of Free-Stream Turbulence on the Turbulence Structure and Heat Transfer in Zero Pressure Gradient Boundary Layers written by M. F. Blair and published by . This book was released on 1982 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: In an earlier funded investigation, experimental research was conducted to deterine the influence of free-stream turbulence on turbulent boundary layer heat transfer and mean profile development. The data obtained under this earlier contract indicated that both the skin friction and the heat transfer increased significantly with increased free-stream turbulence level. Under the present investigation, detailed boundary layer turbulence structural data and turbulent heat transfer data were obtained for experimental test conditions and profile locations selected from the earlier test matrix. Numerious measurements assured that the present test conditions (boundary layer development and free-stream turbulence distributions) duplicated those of the earlier contract. The purposes for making these present detailed boundary layer turbulence measurements were: to provide data to which current finite-difference boundary layer turbulence models could be compared, and to generate a data base for the development of new analytical models for bondary layer heat transfer prediction. With the completion of the experimental portion of this investigation, a theoretical effort was made to assess the capability of a finite difference boundary layer computer program, ABLE (Analysis of the Boundary Layer Equations) for predicting the effect of free-stream turbulence on momentum and thermal boundary layers.
Book Synopsis Experimental and Analytical Study of the Effects of Free-Stream Turbulence on Turbulent Boundary Layers with Heat Transfer by : M. F. Blair
Download or read book Experimental and Analytical Study of the Effects of Free-Stream Turbulence on Turbulent Boundary Layers with Heat Transfer written by M. F. Blair and published by . This book was released on 1982 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Under the present investigation, detailed boundary layer turbulence structural data and turbulent heat transfer data were obtained for experimental test conditions and profile locations selected from the earlier text matrix. Numerous measurements assured that the present test conditions (boundary layer development and free-stream turbulence distributions) duplicated those of the earlier AFOSR contract. The purposes for making these present detailed boundary layer turbulence measurements were: (1) to provide data to which current finite-difference boundary layer turbulence models could be compared, and (2) to generate a data base for the development of new analytical models for boundary layer heat transfer prediction. The results from the present program have shown that the distributions of both the turbulence kinetic energy and the turbulence structural coefficients were affected by increased levels of free-stream turbulence. Local profile measurements indicated that the effect of increased free-stream turbulence was to decrease the near-wall turbulent Prandtl number relative to values expected for low free-stream turbulence. Turbulent Prandtl numbers in the outer region of the boundary layer were slightly increased for higher free-stream turbulence. A turbulence dependent correlation for the measured distribution of turbulent Prandtl number is given.
Book Synopsis An Experimental Study of Turbulent Boundary Layers Subjected to High Free-Stream Turbulence Effects by :
Download or read book An Experimental Study of Turbulent Boundary Layers Subjected to High Free-Stream Turbulence Effects written by and published by . This book was released on 2005 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis was on nominally two-dimensional turbulent boundary layers at zero pressure gradient subjected to high free-stream turbulent intensities of up to 7.9% in preparations for high free-stream turbulence studies on three-dimensional boundary layers. The two-dimensional turbulent flow that will impinge three-dimensional bodies needed to be characterized, before the three-dimensional studies can be made. An active turbulence generator designed to create high free-stream turbulence intensities in the wind tunnel was tested and modified in order to obtain the lowest possible mean flow non-uniformities. A seven-hole pressure probe was used to obtain planes of mean velocity measurements. A three-component state of the art laser-Doppler velocimeter (LDV) was used to obtain mean and fluctuating velocities. Previous high free-stream turbulence studies have been reviewed and are discussed, and some of the previously published data of other authors have been corrected. Based on the measurements obtained with the LDV, it was also determined that the semi-log law of the wall is valid for high free-stream turbulence cases, but with different constants than the ones proposed by Coles, where the constants for the high free-stream cases may be dependent on the turbulence intensity. For the first time, the skin friction coefficient (CO was deduced from the viscous sublayer. The difference between the Utau obtained in the viscous sublayer mean velocity profile and the Utau obtained in the semi-log layer was 1.5%. The skin friction coefficient was determined to increase by 10.5% when the two-dimensional turbulent boundary layer was subjected to high free-stream turbulence effects. Spectral data were compared to the von Karmen and Pope's model spectra; the von Karman spectrum was proven to fit slightly better. Finally the Hancoc-Bradshaw-Blair parameter agreed very well with previously published data.
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781724222503 Total Pages :286 pages Book Rating :4.2/5 (225 download)
Book Synopsis Free-Stream Turbulence and Concave Curvature Effects on Heated, Transitional Boundary Layers by : National Aeronautics and Space Administration (NASA)
Download or read book Free-Stream Turbulence and Concave Curvature Effects on Heated, Transitional Boundary Layers written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-24 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation of the transition process on flat-plate and concave curved-wall boundary layers for various free-stream turbulence levels was performed. Results show that for transition of a flat-plate, the two forms of boundary layer behavior, identified as laminar-like and turbulent-like, cannot be thought of as separate Blasius and fully-turbulent profiles, respectively. Thus, simple transition models in which the desired quantity is assumed to be an average, weighted on intermittency, of the theoretical laminar and fully turbulent values is not expected to be successful. Deviation of the flow identified as laminar-like from theoretical laminar behavior is shown to be due to recovery after the passage of a turbulent spot, while deviation of the flow identified as turbulent-like from the full-turbulent values is thought to be due to incomplete establishment of the fully-turbulent power spectral distribution. Turbulent Prandtl numbers for the transitional flow, computed from measured shear stress, turbulent heat flux and mean velocity and temperature profiles, were less than unity. For the curved-wall case with low free-stream turbulence intensity, the existence of Gortler vortices on the concave wall within both laminar and turbulent flows was established using liquid crystal visualization and spanwise velocity and temperature traverses. Transition was found to occur via a vortex breakdown mode. The vortex wavelength was quite irregular in both the laminar and turbulent flows, but the vortices were stable in time and space. The upwash was found to be more unstable, with higher levels of u' and u'v', and lower skin friction coefficients and shape factors. Turbulent Prandtl numbers, measured using a triple-wire probe, were found to be near unity for all post-transitional profiles, indicating no gross violation of Reynolds analogy. No evidence of streamwise vortices was seen in the high turbulence intensity case. Kim, J. and Simon, T. W. Unspecified Cen...
Book Synopsis An Experimental and Analytical Study of Boundary Layers in Highly Turbulent Freestreams by : M. F. Blair
Download or read book An Experimental and Analytical Study of Boundary Layers in Highly Turbulent Freestreams written by M. F. Blair and published by . This book was released on 1979 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental research has been conducted to determine the influence of free-stream turbulence on zero pressure gradient, incompressible, fully turbulent boundary layer flow. During this period convective heat transfer coefficients, boundary layer mean velocity and temperature profile and wall static pressure distribution data were obtained for two flow conditions of constant free-stream velocity and low free-stream turbulence intensity and for one flow condition of constant free-stream velocity and higher free-stream turbulence. Documentation of the free-stream turbulence for these flows is currently in progress. The conclusion reached from the low free-stream turbulence test results is that these data are in excellent agreement with classic two-dimensional, low free-stream turbulence, turbulent boundary layer correlations, thus establishing the absolute accuracy of the experiment. The data obtained for the higher free-stream turbulence test case indicates that free-stream turbulence does have a significant effect on fully turbulent boundary layer skin friction and heat transfer. A quantitative assessment of this influence will emerge as data is obtained for additional free-stream turbulence levels and as the turbulence distributions are documented.
Book Synopsis Response au seditieux escrit intitulé "L'Esprit de paix" fait en faveur du Mazarin et semé par toute la ville ... by :
Download or read book Response au seditieux escrit intitulé "L'Esprit de paix" fait en faveur du Mazarin et semé par toute la ville ... written by and published by . This book was released on 1652 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Study of the Effect of Free Stream Turbulence on Adverse Pressure Gradient Boundary Layer Heat and Momentum Transfer by : Alex James Giese
Download or read book An Experimental Study of the Effect of Free Stream Turbulence on Adverse Pressure Gradient Boundary Layer Heat and Momentum Transfer written by Alex James Giese and published by . This book was released on 1999 with total page 456 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Influence of Free-Stream Turbulence on the Zero Pressure Gradient Fully Turbulent Boundary Layer by :
Download or read book The Influence of Free-Stream Turbulence on the Zero Pressure Gradient Fully Turbulent Boundary Layer written by and published by . This book was released on 1980 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental research has been conducted to determine the influence of free-stream turbulence on zero pressure gradient fully turbulent boundary layer flow. During this period convective heat transfer coefficients, boundary layer mean velocity and temperature profile data, and wall static pressure distribution data were obtained for five flow conditions of constant free-stream velocity and free-stream turbulence intensities ranging from approximately 1/4% to 7%. Free-stream multi-component turbulence intensity, longitudinal integral scale, and spectral distributions were obtained for the various turbulence levels. The test results with 1/4% free-stream turbulence indicate that these data are in excellent agreement with classic two-dimensional low free-stream turbulence, turbulent boundary layer correlations, thus establishing the absolute accuracy of the experiment. The data obtained for the test cases with higher free-stream turbulence indicate that the turbulence has a significant effect on turbulent boundary layer skin friction and heat transfer. It has been shown that these effects are a function of the free-stream turbulence intensity, the turbulence length scale, and the boundary layer momentum thickness Reynolds number. Suggested correlations for the influence of free-stream turbulence on skin friction, heat transfer, and Reynolds analogy factor are given. Also during this period, a boundary layer prediction method has been assessed as to its ability to predict free-stream turbulence effects on flat plate heating and skin friction. Comparisons with the experimental data obtained here showed that adequate predictions can be made for this case with an existing turbulence model. (Author).
Book Synopsis NASA Technical Report by : United States. National Aeronautics and Space Administration
Download or read book NASA Technical Report written by United States. National Aeronautics and Space Administration and published by . This book was released on 1962 with total page 772 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis An Experimental Investigation of the Bursting Phenomenon in a Turbulent Boundary Layer by : Henry Hing Wue Woo
Download or read book An Experimental Investigation of the Bursting Phenomenon in a Turbulent Boundary Layer written by Henry Hing Wue Woo and published by . This book was released on 1972 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fluid Mechanics, Acoustics, and Design of Turbomachinery by : B. Lakshminarayana
Download or read book Fluid Mechanics, Acoustics, and Design of Turbomachinery written by B. Lakshminarayana and published by . This book was released on 1974 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
