Three-Dimensional Laminar Boundary Layer Over Body of Revolution at Incidence. Part VIII. The Case of Low Incidence Involving Circumferential-Flow Reversal PDF Download
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Author: K. C. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 57
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Book Description
This work concerns an investigation of three-dimensional laminar boundary layer over a blunt body (prolate spheroid) at low incidence and with reversed flow. Results reflecting the general characteristics of such a problem are presented. More significant are the features relating to the circumferential-flow reversal.
Author: K. C. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 57
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Book Description
This work concerns an investigation of three-dimensional laminar boundary layer over a blunt body (prolate spheroid) at low incidence and with reversed flow. Results reflecting the general characteristics of such a problem are presented. More significant are the features relating to the circumferential-flow reversal.
Author: K. C. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 45
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Book Description
The report presents results of exact, full three-dimensional solutions of the incompressible laminar boundary layer over a prolate spheroid at an extremely high incidence. In contrast to the high incidence (30 degrees) case recently reported, this extremely high incidence (45 degrees) problem is characterized by features reflecting the predominance of the circumferential flow over the meridional flow and, more importantly, by a closed, rather than an open, separation pattern. These features include much larger circumferential skin friction than meridional skin friction and that the limiting streamlines are more closely oriented along the parallels. (Author).
Author: K. C.. Wang
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ISBN:
Category : Body of revolution
Languages : en
Pages : 0
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Category : Aeronautics
Languages : en
Pages : 1010
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Author: Kuo C. Wang
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Category :
Languages : en
Pages : 86
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Book Description
The previously investigated three-dimensional boundary layer near the plane of symmetry of an inclined spheroid is extended along three directions: wider range of solutions, explanations to questions left unanswered before, and comparisons with experiments. Extended solutions provide more complete trends for incidences from zero to 90 degrees and for thickness ratios ranging from unity for a sphere to nearly zero for a long inclined sylinder. Among these trends is how the separation changes from one type to another and then back again with increasing incidence. Explanations are given for a number of unconventional features; included here is why the lateral derivative of the cross velocity profile reverses. Agreement with Wilson's recent experiments (designed specifically for partial check of the results obtained earlier) enhances the significance of the investigation undertaken.
Author: K. C. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 54
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Book Description
The report presents general methods for calculating three-dimensional laminar boundary layers over inclined blunt bodies (not necessarily bodies of revolution). Complete incompressible results for a prolate spheroid at 30 degrees incidence are presented, and the computational procedures are described. The rule of the zone of dependence was observed. The results display for the first time the boundary layer structure over a non-spherical and non-conical blunt body in all details, and confirm the open-type of separation proposed earlier. (Author).
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Category : Government reports announcements & index
Languages : en
Pages : 882
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Author: V. C. Patel
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Category :
Languages : en
Pages : 29
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Book Description
An experimental and theoretical study of three-dimensional boundary layers on bodies of revolution at incidence was conducted during the period May 1980-July 1983. This final report summarizes the technical accomplishments. Reference is made to previous reports and papers resulting from the study and some recent experimental results on the boundary layer in the plane of symmetry and the vortex formation region are presented. One of the primary objectives of this study was to develop instrumentation for the measurement of the mean flow and the Reynolds stresses in three-dimensional turbulent boundary layers, and to use these to supplement the mean-flow measurements made earlier by Ramaprian, Patel and Choi on the combination body at an incidence of 15 degrees.
Author: V. C. Patel
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
This report summarizes the objectives and accomplishments of an experimental and theoretical investigation of the boundary layer development on bodies of revolution at incidence. The results of the flow visualization studies in laminar flow, detailed measurements in a turbulent boundary layer, and calculations of laminar as well as turbulent boundary layers using two different numerical schemes and turbulence models are reviewed to emphasize the important characteristics of separation in three dimensions.
Author: K. C. Wang
Publisher:
ISBN:
Category :
Languages : en
Pages : 202
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Book Description
The report documents the program 'BLIND3' and its associated difference methods. BLIND3 stands for Boundary Layer in 3 Dimensions. This program is for calculating genuine three-dimensional, incompressible, laminar boundary layer over a blunt-body at incidence. The whole calculation consists of the following five parts: inviscid calculations from known inviscid solution, stagnation-point boundary layer, symmetry-plane boundary layer, nose region boundary layer, and main body boundary layer. This program has been written in FORTRAN 5 language, and used for a UNIVAC 1108 computer in batch mode and under Exec. 8 system. It has been employed to obtain complete boundary layer solutions for a prolate spheroid at low and high incidences.
