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Control Of Gortler Vortices In High Speed Boundary Layers
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Book Synopsis Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers by : Jie Ren
Download or read book Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers written by Jie Ren and published by Springer. This book was released on 2017-10-27 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis first reveals the mechanism of Görtler instabilities and then demonstrates how transitions at hypersonic flows can be effectively controlled (either promoted or suppressed) with Görtler or Klebanoff modes. It focuses on understanding and controlling flow transitions from mild laminar to fully turbulent flows at high speeds—aspects that have become crucial at the dawn of an incredible era, in which hypersonic vehicles are becoming available. Once this occurs, it will be possible to travel from Beijing to Los Angeles within just 2 hours, and we will all live in a genuinely global village—and not just virtually, but physically. Görtler instabilities have often been used to promote flow transition in hypersonic vehicles. However, how Görtler instabilities are excited and how they evolve in hypersonic flows are questions that have yet to be answered.
Book Synopsis Control of Görtler Vortices in High-speed Boundary Layers by : Radwa Alaziz
Download or read book Control of Görtler Vortices in High-speed Boundary Layers written by Radwa Alaziz and published by . This book was released on 2017 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: Görtler vortices develop in boundary layer flows over concave surfaces due to the imbalance between centrifugal forces and the wall-normal pressure gradient. These vortices can be efficient precursors to transition in boundary layers exposed to freestream disturbance or surface non-uniformities, because they can alter the mean flow causing the laminar flow to breakdown into turbulence. In this thesis, a control technique aimed at reducing the energy associated with Görtler vortices that develop in supersonic boundary layers is introduced and tested. The control algorithm is based on distributed blowing and suction, with sensors placed either in the flow or at the wall. The result show that there is a dependence between the efficiency of the control algorithm and the spanwise separation of the vortices, that is the energy reduction is more significant for larger spanwise separations. The efficiency of the control algorithm seems to be insensitive to the variation of the Mach number.
Book Synopsis The Effect of Wall Cooling and Heating on Görtler Vortices in High-speed Boundary Layers by : Safae El Amrani
Download or read book The Effect of Wall Cooling and Heating on Görtler Vortices in High-speed Boundary Layers written by Safae El Amrani and published by . This book was released on 2018 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: strong velocity gradients in both wall-normal and spanwise directions. This determines the flow structures to become more prone to secondary instabilities, which prompt to an early transition from laminar to turbulent flow, ultimately increasing the frictional drag. It is possible to circumvent these secondary instabilities by means of passive or active flow control strategies. In this thesis, the effect of wall cooling and heating on Görtler vortices developing in supersonic and hypersonic boundary layers is investigated from a numerical point of view. The wall temperature is imposed through a ramping function that decreases or increases an upstream wall temperature in the streamwise direction. The results show that this type of wall cooling or heating has a mild (adverse) effect on the vortex energy, and a considerable (but beneficial) effect on the wall shear stress.
Book Synopsis On the Gortler Vortex Instability Mechanism at Hypersonic Speeds by : Philip Hall
Download or read book On the Gortler Vortex Instability Mechanism at Hypersonic Speeds written by Philip Hall and published by . This book was released on 1989 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Control of Görtler Vortices by Means of Wall Deformations and Blowing/suction by : Lamiae Taoudi
Download or read book Control of Görtler Vortices by Means of Wall Deformations and Blowing/suction written by Lamiae Taoudi and published by . This book was released on 2016 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Görtler vortices evolve in boundary layers over concave surfaces as a result of the imbalance between centrifugal forces and radial pressure gradients. Depending on various geometrical and free-stream flow conditions, these instabilities may lead to secondary instabilities and early transition to turbulence. In this thesis, a control algorithm based on the boundary region equations is applied to reduce the strength of the Görtler instabilities by controlling the energy of the fully developed vortices, using either local wall deformations or blowing/suction at the wall. A proportional-integral control scheme is utilized to deform the wall or to provide transpiration velocity, where the inputs are either the wall-normal or streamwise velocity components in a plane that is parallel to the wall. The results show that the control based on wall deformation using wall-normal velocity components is more effective in tempering the vortex during its streamwise growth by almost one or two orders of magnitude.
Book Synopsis The Growth of Goertler Vortices in Compressible Boundary Layers by :
Download or read book The Growth of Goertler Vortices in Compressible Boundary Layers written by and published by . This book was released on 1987 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Fully Nonlinear Development of Görtler Vortices in Growing Boundary Layers by : Philip Hall
Download or read book The Fully Nonlinear Development of Görtler Vortices in Growing Boundary Layers written by Philip Hall and published by . This book was released on 1987 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Goertler Vortex Instability Mechanism in Three-dimensional Boundary Layers by : Institute for Computer Applications in Science and Engineering
Download or read book The Goertler Vortex Instability Mechanism in Three-dimensional Boundary Layers written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1984 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Vortex Instabilities in 3D Boundary Layers: The Relationship Between Goertler and Crossflow Vortices by : Institute for Computer Applications in Science and Engineering
Download or read book Vortex Instabilities in 3D Boundary Layers: The Relationship Between Goertler and Crossflow Vortices written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1990 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Nonlinear Development of Gortler Vortices in Growing Boundary Layers by : Philip Hall
Download or read book The Nonlinear Development of Gortler Vortices in Growing Boundary Layers written by Philip Hall and published by . This book was released on 1986 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stability of Gortler Vortices in Boundary Layers by : George Chi-Fung Ng
Download or read book Stability of Gortler Vortices in Boundary Layers written by George Chi-Fung Ng and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Görtler Vortex Instability Mechanism in Three-dimensional Boundary Layers by : Philip Hall
Download or read book The Görtler Vortex Instability Mechanism in Three-dimensional Boundary Layers written by Philip Hall and published by . This book was released on 1984 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Growth of Görtler Vortices in Compressible Boundary Layers by : Philip Hall
Download or read book The Growth of Görtler Vortices in Compressible Boundary Layers written by Philip Hall and published by . This book was released on 1987 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fully Nonlinear Development of the Most Unstable Goertler Vortex in a Three Dimensional Boundary Layer by : Institute for Computer Applications in Science and Engineering
Download or read book Fully Nonlinear Development of the Most Unstable Goertler Vortex in a Three Dimensional Boundary Layer written by Institute for Computer Applications in Science and Engineering and published by . This book was released on 1992 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flow Visualization by : Alexander J. Smits
Download or read book Flow Visualization written by Alexander J. Smits and published by World Scientific. This book was released on 2012 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the 2nd edition of the book, Flow Visualization: Techniques and Examples, which was published by Imperial College Press in 2000. Many of the chapters have been revised and updated to take into consideration recent changes in a number of flow visualization and measurement techniques, including an updated high quality flow gallery. Unique among similar publications, this book focuses on the practical rather than theoretical aspects. Obtaining high quality flow visualization results is, in many ways, more of an art than a science, and experience plays a key deciding role. The depth and breadth of the material will make this book invaluable to readers of all levels of experience in the field.
Book Synopsis Görtler Vortices in Growing Boundary Layers: the Leading Edge Receptivity Problem, Linear Growth and the Nonlinear Breakdown Stage by : Philip Hall
Download or read book Görtler Vortices in Growing Boundary Layers: the Leading Edge Receptivity Problem, Linear Growth and the Nonlinear Breakdown Stage written by Philip Hall and published by . This book was released on 1989 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Taylor-Görtler Instabilities of Tollmien-Schlichting Waves and Other Flows Governed by the Interactive Boundary Layer Equations by : Philip Hall
Download or read book Taylor-Görtler Instabilities of Tollmien-Schlichting Waves and Other Flows Governed by the Interactive Boundary Layer Equations written by Philip Hall and published by . This book was released on 1985 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
