Crossflow Effects On The Growth Rate Of Inviscid Goertler Vortices In A Hypersonic Boundary Layer PDF Download

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Crossflow Effects on the Growth Rate of Inviscid Goertler Vortices in a Hypersonic Boundary Layer

Crossflow Effects on the Growth Rate of Inviscid Goertler Vortices in a Hypersonic Boundary Layer
Author: National Aeronautics and Space Administration (NASA)
Publisher: Createspace Independent Publishing Platform
Total Pages: 42
Release: 2018-07
Genre:
ISBN: 9781722137748
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The effects of crossflow on the growth rate of inviscid Goertler vortices in a hypersonic boundary layer with pressure gradient are studied. Attention is focused on the inviscid mode trapped in the temperature adjustment layer; this mode has greater growth rate than any other mode. The eigenvalue problem which governs the relationship between the growth rate, the crossflow amplitude, and the wavenumber is solved numerically, and the results are then used to clarify the effects of crossflow on the growth rate of inviscid Goertler vortices. It is shown that crossflow effects on Goertler vortices are fundamentally different for incompressible and hypersonic flows. The neutral mode eigenvalue problem is found to have an exact solution, and as a by-product, we have also found the exact solution to a neutral mode eigenvalue problem which was formulated, but unsolved before, by Bassom and Hall (1991). Fu, Yibin and Hall, Philip Unspecified Center NAS1-18605; NAS1-8107; AF-AFOSR-89-0042; RTOP 505-90-52-01...

Hypersonic Inviscid Flow

Hypersonic Inviscid Flow
Author: Wallace D. Hayes
Publisher: Courier Corporation
Total Pages: 628
Release: 2012-07-13
Genre: Science
ISBN: 0486160483
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Unified, self-contained view of nonequilibrium effects, body geometries, and similitudes available in hypersonic flow and thin shock layer; appropriate for graduate-level courses in hypersonic flow theory. 1966 edition.

Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers

Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers
Author: Jie Ren
Publisher: Springer
Total Pages: 110
Release: 2017-10-27
Genre: Technology & Engineering
ISBN: 9811068321
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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.