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An Experimental and Analytical Study of Boundary Layers in Highly Turbulent Free-streams

1981
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Release : 1981
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Book Synopsis An Experimental and Analytical Study of Boundary Layers in Highly Turbulent Free-streams by : M. F. Blair

Download or read book An Experimental and Analytical Study of Boundary Layers in Highly Turbulent Free-streams written by M. F. Blair. This book was released on 1981. Available in PDF, EPUB and Kindle. Book excerpt: Research was conducted to examine two aspects of boundary layer flow: 1) the influence of free-stream turbulence on zero pressure gradient, full turbulent boundary layer flow; and 2) the combined effects of free-stream turbulence and favorable streamwise pressure gradients on transitional boundary layer flow. Keywords: Convective heat transfer coefficients; Boundary layer transition; Gas turbine airfoils; Boundary layer mean velocity; Experimental data. (edc).

An Experimental and Analytical Study of Boundary Layers in Highly Turbulent Freestreams

1979
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Release : 1979
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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. This book was released on 1979. 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.

Experimental and Analytical Study of the Effects of Free-Stream Turbulence on Turbulent Boundary Layers with Heat Transfer

1982
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Release : 1982
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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. This book was released on 1982. 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.

Study of Unsteady Turbulent Boundary Layers

1983 Turbulent boundary layer
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Release : 1983
Genre : Turbulent boundary layer
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Book Synopsis Study of Unsteady Turbulent Boundary Layers by : Angel Nicolas Menendez

Download or read book Study of Unsteady Turbulent Boundary Layers written by Angel Nicolas Menendez. This book was released on 1983. Available in PDF, EPUB and Kindle. Book excerpt: A turbulent boundary layer, subjected to a free-stream velocity which changes sinusiodally in time under a zero time mean pressure gradient, is studied both experimentally and analytically. Using a two-component Laser Doppler Anemometer and a Heat Flux Gage, detailed and high quality information is obtained on the instantaneous velocity distribution and wall shear stress, respectively, at various stations. An asymptotic theory, for large Reynolds numbers, is developed for the oscillatory motion. It is valid for both boundary layers at arbitrary time-mean pressure gradients and fully developed pipe and channel flow, and is successfully applied to the present and previous available experimental information. The theory identifies two frequency parameters, in terms of which four different frequency regimes are defined. Similarity laws are identified for each one of these frequency regimes. All the experimental data have been archived on magnetic tape. (Author).

Scientific and Technical Aerospace Reports

1995 Aeronautics
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Release : 1995
Genre : Aeronautics
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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by . This book was released on 1995. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

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