High Speed Boundary Layer Transition
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| Author | : Vallampati Ramachandra Prasad |
| Publisher | : BoD – Books on Demand |
| Total Pages | : 236 |
| Release | : 2020-01-22 |
| Genre | : Mathematics |
| ISBN | : 1839681853 |
Written by experts in the field, this book, "Boundary Layer Flows - Theory, Applications, and Numerical Methods" provides readers with the opportunity to explore its theoretical and experimental studies and their importance to the nonlinear theory of boundary layer flows, the theory of heat and mass transfer, and the dynamics of fluid. With the theory's importance for a wide variety of applications, applied mathematicians, scientists, and engineers - especially those in fluid dynamics - along with engineers of aeronautics, will undoubtedly welcome this authoritative, up-to-date book.
| Author | : Colin Phillip Coleman |
| Publisher | : |
| Total Pages | : 212 |
| Release | : 1998 |
| Genre | : |
| ISBN | : |
| Author | : Leslie M. Mack |
| Publisher | : |
| Total Pages | : |
| Release | : 1972* |
| Genre | : Boundary layer |
| ISBN | : |
| Author | : Hermann F. Fasel |
| Publisher | : |
| Total Pages | : 126 |
| Release | : 2005 |
| Genre | : High-speed aeronautics |
| ISBN | : |
| Author | : Low-Speed Boundary-Layer Transition Workshop (2nd : 1976 : Santa Monica, Calif.) |
| Publisher | : |
| Total Pages | : 287 |
| Release | : 1978 |
| Genre | : |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 16 |
| Release | : 1990 |
| Genre | : |
| ISBN | : |
| Author | : Sofia Yassir |
| Publisher | : |
| Total Pages | : 67 |
| Release | : 2016 |
| Genre | : |
| ISBN | : |
The research on transition in supersonic and hypersonic boundary layers has been reinvigorated in the last decades because of the increased interest in high-speed flight. The receptivity to environmental disturbances of high-speed boundary layers developing over flat plates or curved surfaces is a very important problem because the transition process is directly impacted by it. The main objective of the research is to determine the effect of small steps on laminar high-speed boundary-layers that are excited by freestream disturbances in the form of vorticity and acoustic waves. Both supersonic and hypersonic regimes are analyzed using a high-order compressible Navier-Stokes numerical algorithm. It is found that both the backward and the forward steps are capable of stabilizing the disturbances that propagate inside the boundary layer. This will potentially delay the formation of three-dimensional disturbances that are precursors to transition into turbulence.
| Author | : Jie Ren |
| Publisher | : Springer |
| Total Pages | : 110 |
| Release | : 2017-10-27 |
| Genre | : Technology & Engineering |
| ISBN | : 9811068321 |
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.
| Author | : Thorwald Herbert |
| Publisher | : |
| Total Pages | : 106 |
| Release | : 1993 |
| Genre | : Boundary layer |
| ISBN | : |
The parabolized stability equations (PSE) are a new and more reliable approach to analyzing the stability of streamwise varying flows such as boundary layers. This approach has been previously validated for idealized incompressible flows. Here, the PSE are formulated for highly compressible flows in general curvilinear coordinates to permit the analysis of high-speed boundary-layer flows over fairly general bodies. Vigorous numerical studies are carried out to study convergence and accuracy of the linear-stability code LSH, and the linear/ nonlinear PSE code, PSH. Physical interfaces are set up to analyze the M=8 boundary layer over a blunt cone calculated by using a thin-layer Navier Stokes (TNLS) code, and the flow over a sharp cone at angle of attack calculated using the AFWAL Parabolized Navier-Stokes (PNS) code'. While stability and transition studies at high speeds are far from routine, the method developed here is the best tool available to research the physical processes in high-speed boundary layers. Parabolized stability equations, Compressible flows, High-speed boundary layers, General bodies.
| Author | : |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 1997 |
| Genre | : |
| ISBN | : |
This grant supported the work of two additional graduate students in the area of high speed boundary layer transition. The non-zero angle of attack measurements were delayed, to reduce the risk of damaging the model, currently in use at zero angle of attack (AOA). Instead, a high sensitivity laser differential interferometer is being developed, for non-intrusive high bandwidth measurements of instability waves. Work towards the larger wind tunnel discussed in the proposal was also advanced, through measurements of the effect of elevated driver tube temperatures on the extent of quiet flow. Apparatus for placement of the elliptic cone at a 3-degree AOA has been designed; these measurements will commence on completion of the zero AOA measurements, late in 1997.
