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2018 | Buch

Kapitel lesen Erstes Kapitel lesen

Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers

Mechanisms and Flow Control on Laminar-Turbulent Transition

verfasst von: Jie Ren

Verlag: Springer Singapore

Buchreihe : Springer Theses

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

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.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract

The flow transition has a critical impact on aerodynamic heating, drag, and vehicle operation because turbulent flows generate tremendously higher friction and heating to the vehicles than laminar ones.

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Chapter 2. Methodology

Abstract

In Fig. 2.1, the numerical methods used in this thesis are outlined.

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Chapter 3. Linear Instability

Abstract

In hypersonic boundary layers, Görtler modes show particular behaviors.

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Chapter 4. Secondary Instability

Abstract

As the steady state for secondary instabilities to set-in, the linear and nonlinear development of Görtler vortices are discussed in this section.

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Chapter 5. Stabilization of the Hypersonic Boundary Layer

Abstract

In hypersonic boundary layers, the Mack’s second mode [1] becomes the dominant disturbances.

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Chapter 6. Conclusions and Outlook

Abstract

Görtler vortices as well as the stabilization/destabilization of 2-D disturbances in high-speed boundary layer flows are numerically investigated.

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Backmatter

Titel: Secondary Instabilities of Görtler Vortices in High-Speed Boundary Layers
verfasst von: Jie Ren
Verlag: Springer Singapore
Electronic ISBN: 978-981-10-6832-4
Print ISBN: 978-981-10-6831-7
DOI: https://doi.org/10.1007/978-981-10-6832-4

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