Flow Transition In Gas Turbine Airfoil Boundary Layers
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Author | : Gregory S. West |
Publisher | : |
Total Pages | : 346 |
Release | : 1985 |
Genre | : Aerofoils |
ISBN | : |
Reshotko has suggested that transition may be viewed as the response of a very complex three-dimensional nonlinear oscillator (the laminar boundary layer) to a random and often statistically nonuniform forcing function (the disturbances). The first objective of this study concerns the phenomenon of flow transition in boundary layers on turbine airfoils--from the onset of turbulence to the transition completion. Transition studies, though fundamental to fluid mechanics, are unique in gas turbine cascades because of the compounding factors that act not in individual isolation, but as a collective group and that constitute by-pass mechanisms not amenable to linear analyses from a mathematical point of view. The second objective is to evolve an engineering method to account for surface roughness effects on heat transfer and turbulent boundary layer analyses, which have heretofore been studied in fragments. Transition prediction in gas turbine boundary layer flows is critical in assessing the cooling requirements for gas turbine vanes and blades. This report summarizes the classical, fundamental findings in transition prediction for simplified geometrics and discusses empirical rules currently in use for gas turbine environments. Keywords: Airfoil boundary layer transition.
Author | : |
Publisher | : |
Total Pages | : 0 |
Release | : 1985 |
Genre | : |
ISBN | : |
Reshotko has suggested that transition may be viewed as the response of a very complex three-dimensional nonlinear oscillator (the laminar boundary layer) to a random and often statistically nonuniform forcing function (the disturbances). The first objective of this study concerns the phenomenon of flow transition in boundary layers on turbine airfoils--from the onset of turbulence to the transition completion. Transition studies, though fundamental to fluid mechanics, are unique in gas turbine cascades because of the compounding factors that act not in individual isolation, but as a collective group and that constitute by-pass mechanisms not amenable to linear analyses from a mathematical point of view. The second objective is to evolve an engineering method to account for surface roughness effects on heat transfer and turbulent boundary layer analyses, which have heretofore been studied in fragments. Transition prediction in gas turbine boundary layer flows is critical in assessing the cooling requirements for gas turbine vanes and blades. This report summarizes the classical, fundamental findings in transition prediction for simplified geometrics and discusses empirical rules currently in use for gas turbine environments. Keywords: Airfoil boundary layer transition.
Author | : |
Publisher | : |
Total Pages | : 246 |
Release | : 2000 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 238 |
Release | : 1985 |
Genre | : Combustion |
ISBN | : |
Author | : Ki-Hyeon Sohn |
Publisher | : |
Total Pages | : 16 |
Release | : 1998 |
Genre | : Boundary layers |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 32 |
Release | : 1996 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 23 |
Release | : 2005 |
Genre | : |
ISBN | : |
1. Gortler vortices on the concave pressure side of a blade; 2. Laminar/turbulent transition on the convex side of a blade; 3. Turbulent separation under the action of the strong adverse pressure gradient; 4. Cooling-film aerodynamics.
Author | : Mohsen Jahanmiri |
Publisher | : |
Total Pages | : 0 |
Release | : 2012 |
Genre | : |
ISBN | : 9783659267611 |
Author | : Rodney C. Schmidt |
Publisher | : |
Total Pages | : 344 |
Release | : 1988 |
Genre | : |
ISBN | : |
Author | : Robert Edward Mayle |
Publisher | : Logos Verlag Berlin GmbH |
Total Pages | : 418 |
Release | : 2018 |
Genre | : Science |
ISBN | : 3832545980 |
Second Enhanced Edition Suitable for advanced-level courses or an independent study in fluid mechanics, this text by an expert in the field provides the basic aspects of laminar-to-turbulent flow transition in boundary layers. Logically organized into three major parts, the book covers pre- and post-transitional flow, transitional flow, and several advanced topics in periodically disturbed transitional flow. Some of the subjects covered within the book include high-frequency unsteady laminar flow, turbulent flow, natural transition, bypass transition, turbulent spot theory, turbulent spot kinematics and production, correlations for the onset and rate of transition, global and conditional averaging, transitional flow models, wakeinduced transition, multimode transition, and separated-flow transition. Containing some 202 figures (all drawn by the author), 28 tables, 12 appendices, a supplement on tensors, and an extensive bibliography, the 415 page book provides a wealth of data and information about the subject.