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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

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.
Jie Ren

Chapter 2. Methodology

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

Chapter 3. Linear Instability

In hypersonic boundary layers, Görtler modes show particular behaviors.
Jie Ren

Chapter 4. Secondary Instability

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

Chapter 5. Stabilization of the Hypersonic Boundary Layer

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

Chapter 6. Conclusions and Outlook

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

Backmatter

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