Book contents
- Frontmatter
- Summary Contents
- Detailed Contents
- Introduction
- Overview of the Book
- 1 Overview and Basic Equations
- 2 Decomposition and Evolution of Disturbances
- 3 Hydrodynamic Flow Stability I: Introduction
- 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–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
- Solutions
- References
11 - Forced Response I – Flamelet Dynamics
Published online by Cambridge University Press: 05 October 2012
Book contents
- Frontmatter
- Summary Contents
- Detailed Contents
- Introduction
- Overview of the Book
- 1 Overview and Basic Equations
- 2 Decomposition and Evolution of Disturbances
- 3 Hydrodynamic Flow Stability I: Introduction
- 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–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
- Solutions
- References
Summary
The final two chapters of this book treat the response of flames to forced disturbances, both time-harmonic and random. This chapter focuses on local flame dynamics; that is, on characterizing the local space-time fluctuations in position of the flame. Chapter 12 treats the resulting heat release induced by disturbances, as well as sound generation by heat release fluctuations. These two chapters particularly stress the time-harmonic problem with more limited coverage of flames excited by stochastic disturbances. This latter problem is essentially the focus of turbulent combustion studies, a topic that is the focus of dedicated treatments [1–3].
These unsteady flame–flow interactions involve kinetic, fluid mechanic, and acoustic processes over a large range of scales. Fundamentally different physical processes may dominate in different regions of the relevant parameter space, depending on the relative magnitudes of various temporal/spatial scales. Section 11.1 starts the chapter by reviewing the key length and time scales involved with flame–flow interactions. Then, Sections 11.2 and 11.3 analyze premixed and non-premixed flame dynamics, respectively.
- Type
- Chapter
- Information
- Unsteady Combustor Physics , pp. 317 - 363Publisher: Cambridge University PressPrint publication year: 2012
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