
Stabilization and Dynamic of Premixed Swirling Flames
Prevaporized, Stratified, Partially, and Fully Premixed Regimes
Description
Key Features
- Features a complete view of the challenges at the intersection of swirling flame combustors, their requirements, and the physics of fluids at work
- Addresses the challenges of turbulent combustion modeling with numerical simulations
- Includes the presentation of the very latest numerical results and analyses of flashback, lean blowout, and combustion instabilities
- Covers the design of a fully premixed injector for future jet engine applications
Readership
Aerospace and mechanical engineers, researchers, masters' and PhD students in aero and mech engineering
Table of Contents
1. The Combustor
1. Overall Principle of the Gas Turbine Engine
1.1. Generalities and Overall Description
1.2. Components/Modules Technologies Description
1.3. Thermodynamics and Non-reacting Fluid Dynamics2. Combustor Role, Requirements and Environment
2.1. Overall View
2.2. Design and Requirements
2.3. Combustor, injector and swirler designs3. Combustor Architectures
3.1. RQL
3.2. LDI
3.3. LPP
3.4. LSI
3.5. LFP4. Operating Conditions and Flight Envelope 54
2. Premixed Combustion for Combustors
1. Mathematical descriptions
1.1. Governing Equations of Reacting Flows
1.2. G-Equation Formalism
1.3. Decomposition in static and dynamic components2. Physical-Chemical Description
2.1. Premixed Combustion Overview
2.2. Swirling Flames Overview
2.3. Acoustics Wave-Flame Interactions
2.4. Autoignition
2.5. Blowout
2.6. Chemical Kinetic
2.7. Combustion Noise
2.8. Combustion Instability
2.9. Flame Speed
2.10. Flame Stretch
2.11. Flammability Limits
2.12. Flashback
2.13. Ignition
2.14. Pollutants Emissions
2.15. Turbulent Combustion
2.16. Turbulent Mixing3. Combustion modes
3.1. Overview
3.2. Pre-vaporized Mode
3.3. Partially Premixed Mode
3.4. Stratified Premixed Mode
3.5. Fully Premixed Mode4. Effect of operating conditions on premixed combustion and impact on flame
4.1. Current operating conditions
4.2. Fuel, equivalence ratio and power settings engine matching3. Premixed Swirling Flame Stabilization
1. Mechanisms and processes of stabilization
1.1. Definitions
1.2. Key stabilization mechanisms: local contributors
1.3. Local equivalence ratio
1.4. Flame stretch
1.5. Flame speed versus flow speed
1.6. Reaction rates
1.7. Vorticity
1.8. Temperature, pressure and density (Equation of State)
1.9. Governing equations
1.10. Role and impact of global flow/flame features2. Framework for flame stabilization study: application
2.1. Numerical procedure
2.2. Statistically steady flame dynamics
3. Theoretical results on flame stabilization and propagation
3.1. Flowfield decomposition and theoretical approach: framework
3.2. Regimes and configurations
3.3. Expressions for laminar and turbulent planar flames in open tubes
3.4. Expressions for the static component of stabilized flame
3.5. Expressions for the dynamic component of stabilized flame
3.6. Swirling flame numerical simulations: results and discussion
3.7. Summary4. Effect of operating conditions, swirl number and fuel on flame stabilization
4. Transient Combustion
1. Introduction
1.1. Definitions
1.2. Data sciences and data analysis
1.3. Measurements and diagnostics2. Unsteady Premixed Combustion
2.1. Laminar unsteady premixed combustion
2.2. Turbulent premixed combustion3. Combustor Engine Transient
4. Configuration Case Study
4.1. Methodology and Numerical Procedure
4.2. Time average versus instantaneous velocity field
4.3. Flashback
4.4. Lean blowout
4.5. Transient to limit cycle5. Fundamentals mechanisms and link between steady and unsteady combustion)
5.1. Static and dynamic stability link
5.2. Static stability
5.3. Dynamic stability6. Technologies and control for flame stabilization and combustion instability
6.1. State of the art
6.2. Effect of swirler position
6.3. Effect of geometry
6.4. Effect of operating condition, equivalence ratio and fuel5. Swirling Flame Dynamic and Combustion Instability
1. Combustor Acoustics
1.1. Combustion instability loop
1.2. Network acoustics model
1.3. Acoustics codes
1.4. Upstream flow modulation versus self-sustained oscillations
1.5. Flow modulation and Navier-Stokes characteristics boundary conditions models (NSCBC)2. Modulated swirling flames dynamic
2.1. Flame responses
2.2. Flow dynamic mode conversion processes occurring upstream of the flame
2.3. Unsteady flame front dynamics
2.4. Combustion dynamics mechanisms3. Combustion instability
3.1. Combustion instability prediction
3.2. Coupling and stability criteria
3.3. Longitudinal instabilities
3.4. Tangential instabilities6. Design and Numerical Simulations Modeling
1. Context and challenges2. Modeling of flow modulations in numerical simulations
2.1. Introduction
2.2. Combustor Dynamics Modulation Models
2.3. Inlet modulation in an isothermal duct
2.4. Application to a bluff-body stabilized flame
2.5. Conclusions3. Modeling approaches and assumptions
3.1. Unsteady Reynolds Averaged Navier-Stokes
3.2. Large Eddy Simulations4. Chemical kinetic
5. Turbulent combustion modeling
5.1. Thickened flame models
5.2. Flamelet models
5.3. Flame surface models
5.4. Probability Density Function models6. A priori filtering for turbulent combustion model
6.1. Introduction
6.2. The a priori filtering method
6.3. DNS Preccinsta dataset
6.4. Results and discussion
6.5. Comparisons for the Thickened Flame model
6.6. Conclusions and perspectives7. Fuel vaporization physics and modeling
8. Supercritical combustion regime at take-off conditions
7. Lean Fully Premixed (LFP) Injector Design
1. Design procedure2. Innovation and concept definition
3. Modeling and sizing
3.1. Vaporizing unit
3.2. Premixing and premixing-stabilizing units4. Conclusion
Conclusion and Perspectives
Product details
- No. of pages: 400
- Language: English
- Copyright: © Academic Press 2020
- Published: July 3, 2020
- Imprint: Academic Press
- eBook ISBN: 9780128199978
- Paperback ISBN: 9780128199961
About the Author
Paul Palies
Affiliations and Expertise
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