Book contents
- Unsteady Combustor Physics
- Unsteady Combustor Physics
- Copyright page
- Summary Contents
- Detailed Contents
- Acknowledgments
- Introduction
- Overview of the Book
- 1 Basic Equations
- 2 Decomposition and Evolution of Disturbances
- 3 Hydrodynamic Flow Stability I: Linear Instability
- 4 Hydrodynamic Flow Stability II: Common Combustor Flow Fields
- 5 Acoustic Wave Propagation I: Basic Concepts
- 6 Acoustic Wave Propagation II: Heat Release, Complex Geometry, and Mean Flow Effects
- 7 Flame Sheet and Flow Interactions
- 8 Ignition
- 9 Internal Flame Processes
- 10 Flame Stabilization, Flashback, Flameholding, and Blowoff
- 11 Forced Response I: Flamelet Dynamics
- 12 Forced Response II: Heat Release Dynamics
- Index
- References
3 - Hydrodynamic Flow Stability I: Linear Instability
Published online by Cambridge University Press: 27 October 2021
- Unsteady Combustor Physics
- Unsteady Combustor Physics
- Copyright page
- Summary Contents
- Detailed Contents
- Acknowledgments
- Introduction
- Overview of the Book
- 1 Basic Equations
- 2 Decomposition and Evolution of Disturbances
- 3 Hydrodynamic Flow Stability I: Linear Instability
- 4 Hydrodynamic Flow Stability II: Common Combustor Flow Fields
- 5 Acoustic Wave Propagation I: Basic Concepts
- 6 Acoustic Wave Propagation II: Heat Release, Complex Geometry, and Mean Flow Effects
- 7 Flame Sheet and Flow Interactions
- 8 Ignition
- 9 Internal Flame Processes
- 10 Flame Stabilization, Flashback, Flameholding, and Blowoff
- 11 Forced Response I: Flamelet Dynamics
- 12 Forced Response II: Heat Release Dynamics
- Index
- References
Summary
In Chapter 2 we showed that flow disturbances can be decomposed into vorticity, entropy, and dilatational/acoustic fluctuations. The next two chapters focus on the evolution of vorticity in flows, and how vorticity in one region of the flow interacts with other regions of vorticity to influence hydrodynamic flow stability, leading to self-organization into concentrated regions of vorticity and flow rotation. Such large-scale structures, embedded on a background of acoustic waves and broadband, smaller-scale turbulence, dominate the unsteady flow fields in combustors. These large-scale structures play important roles in processes such as combustion instabilities, mixing and entrainment, flashback, and blowoff. For example, we will discuss vortex–flame interactions repeatedly in discussions of combustion instabilities in later chapters.
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- Unsteady Combustor Physics , pp. 81 - 112Publisher: Cambridge University PressPrint publication year: 2021