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
8 - Ignition
Published online by Cambridge University Press: 27 October 2021
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
Summary
This chapter describes the processes associated with spontaneous (or “autoignition”) and forced ignition. The forced ignition problem is of significant interest in most combustors, as an external ignition source is almost always needed to initiate reaction. Two examples where the autoignition problem is relevant for flowing systems are illustrated in Figure 8.1 [1–10]. Figure 8.1(a) depicts the autoignition of high-temperature premixed reactants in a premixing duct. This is generally undesirable and an important design consideration in premixer design. Figure 8.1(b) depicts the ignition of a jet of premixed reactants by recirculating hot products. In this case, autoignition plays an important role in flame stabilization and the operational space over which combustion can be sustained. Although not shown, autoignition can also occur during the injection of a fuel, air, or premixed reactants jet into a stream of hot fuel, air, or products. For example, a vitiated H2/CO stream reacts with a cross-flow air jet in RQL combustors [11].
- Type
- Chapter
- Information
- Unsteady Combustor Physics , pp. 296 - 320Publisher: Cambridge University PressPrint publication year: 2021
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