A Simple New Analysis of Compressible Turbulent Two-Dimensional Skin Friction Under Arbitrary Conditions PDF Download
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Author: F. M. White Publisher: ISBN: Category : Languages : en Pages : 103
Book Description
A new approach is proposed for analyzing the compressible turbulent boundary layer with arbitrary pressure gradient. The new theory generalizes an incompressible study to account for variations in wall temperature and free- stream Mach number and temperature. By properly handling the law-of-the-wall in the integration of momentum and continuity across the boundary layer, one may obtain a single ordinary differential equation for skin friction devoid of integral thicknesses and shape factors. The new differential equation is analyzed for various cases. For flat plate flow, a new relation is derived which is accurate for adiabatic flow and reasonably good for flow with heat transfer. For flow with strong adverse and favorable pressure gradients, the new theory is in good agreement with experiment. The new theory also contains an explicitly criterion for boundary layer flow separation.
Author: F. M. White Publisher: ISBN: Category : Languages : en Pages : 103
Book Description
A new approach is proposed for analyzing the compressible turbulent boundary layer with arbitrary pressure gradient. The new theory generalizes an incompressible study to account for variations in wall temperature and free- stream Mach number and temperature. By properly handling the law-of-the-wall in the integration of momentum and continuity across the boundary layer, one may obtain a single ordinary differential equation for skin friction devoid of integral thicknesses and shape factors. The new differential equation is analyzed for various cases. For flat plate flow, a new relation is derived which is accurate for adiabatic flow and reasonably good for flow with heat transfer. For flow with strong adverse and favorable pressure gradients, the new theory is in good agreement with experiment. The new theory also contains an explicitly criterion for boundary layer flow separation.
Author: Daniel C. Reda Publisher: ISBN: Category : Fluid mechanics Languages : en Pages : 80
Book Description
An experimental program was conducted to investigate effects of roughness, and roughness superimposed on single and/or multiple, shallow, periodic waveforms, on turbulent boundary-layer skin friction and velocity profile, in compressible, adiabatic flow. Test conditions were Mach number = 2.9 and Reynolds number/ft = 2 million to 8 million. The planar models included smooth, sand-grain, machined and molded surface finishes. Direct measurements of surface shear and Pitot/recovery temperature profiles were obtained. (Modified author abstract).
Author: Publisher: ISBN: Category : Languages : en Pages : 34
Book Description
The report outlines the details for engineering use of White's two- dimensional theory of turbulent skin friction under arbitrary compressible flow conditions. The new method is not only simple but accurate. It is recommended for general use by engineering designers. The method concerns skin friction only. The report presents methods for hand or digital computer computation. Several examples are presented.
Author: Royal Aeronautical Society Publisher: ISBN: 9780856790409 Category : Skin friction (Aerodynamics) Languages : en Pages : 16
Book Description
"ESDU 73016 gives curves and an equation for the value of Reynolds number based on distance along the plate above which an increase in roughness height will not affect skin friction dray. Also given are curves for the mean skin friction on an aerodynamically smooth, or a fully rough, plate at zero incidence for Mach numbers from 0 to 5 for various roughness heights. The use of the data for cylinders, and for cones and wedges in supersonic flow, is explained. Comparison with experimental data shows an r.m.s. error of 3 per cent in incompressible flow rising to 9 per cent for compressible adiabatic flow."--Page [4] of cover.
Author: F. M. White
Author: F. M. White
Author: Daniel C. Reda
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Author: John B. Peterson
Author: Aubrey M. Cary
Author: Eugene E. Covert
Author: Royal Aeronautical Society
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