Ebook: Unsteady Combustion

This book contains selected papers prepared for the NATO Advanced Study Institute on "Unsteady Combustion", which was held in Praia da Granja, Portugal, 6-17 September 1993. Approximately 100 delegates from 14 countries attended. The Institute was the most recent in a series beginning with "Instrumentation for Combustion and Flow in Engines", held in Vimeiro, Portugal 1987 and followed by "Combusting Flow Diagnostics" conducted in Montechoro, Portugal in 1990. Together, these three Institutes have covered a wide range of experimental and theoretical topics arising in the research and development of combustion systems with particular emphasis on gas-turbine combustors and internal combustion engines. The emphasis has evolved roughly from instrumentation and experimental techniques to the mixture of experiment, theory and computational work covered in the present volume. As the title of this book implies, the chief aim of this Institute was to provide a broad sampling of problems arising with time-dependent behaviour in combustors. In fact, of course, that intention encompasses practically all possibilities, for "steady" combustion hardly exists if one looks sufficiently closely at the processes in a combustion chamber. The point really is that, apart from the excellent paper by Bahr (Chapter 10) discussing the technology of combustors for aircraft gas turbines, little attention is directed to matters of steady performance. The volume is divided into three parts devoted to the subjects of combustion-induced oscillations; combustion in internal combustion engines; and experimental techniques and modelling.

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Unsteady Combustion is divided into three parts: combustion-induced oscillations; internal combustion engines; and experimental techniques and modelling. Part 1 of the book deals with combustion instabilities, pulsed combustors, and active control of unsteady motions, and constitutes an excellent survey of the range of problems central to combustion instabilities.
Internal combustion engines will undoubtedly be the prime movers in ground transportation for many years, if not decades to come. The major problems in practice are fuel efficiency and the emission of pollutants: all of the papers in Part 2 address these two problems.
The third part of the book deals with quite general laser diagnostics and modelling aspects, including computer simulations which, while a young subject, hold out the promise of a long and important future.

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Unsteady Combustion is divided into three parts: combustion-induced oscillations; internal combustion engines; and experimental techniques and modelling. Part 1 of the book deals with combustion instabilities, pulsed combustors, and active control of unsteady motions, and constitutes an excellent survey of the range of problems central to combustion instabilities.
Internal combustion engines will undoubtedly be the prime movers in ground transportation for many years, if not decades to come. The major problems in practice are fuel efficiency and the emission of pollutants: all of the papers in Part 2 address these two problems.
The third part of the book deals with quite general laser diagnostics and modelling aspects, including computer simulations which, while a young subject, hold out the promise of a long and important future.
Content:
Front Matter....Pages i-viii
Front Matter....Pages ix-ix
Unsteady Flames and the Rayleigh Criterion....Pages 1-16
Premixed Combustion in a Periodic Flow Field....Pages 17-32
An Experimental and Numerical Investigation of Premixed Combustion in a Vortex in a Laboratory Dump Combustor....Pages 33-69
The influence of Fuel/Air Mixture Oscillations on the Formation of Self-Sustained Combustion Instabilities in Premixed Combustion Systems....Pages 71-82
Some Modeling Methods of Combustion Instabilities....Pages 83-112
Pulse Combustion Applications: Past, Present and Future....Pages 113-137
Recent Progress in the Implementation of Active Combustion Control....Pages 139-160
Suppression of Combustion Oscillation of Premixed Flames by Active Control....Pages 161-171
Combustion Instabilities in Propulsion Systems....Pages 173-241
Aircraft Turbine Engine NOx Emission Abatement....Pages 243-264
Front Matter....Pages 265-265
Diagnostics of Diesel Combustion....Pages 267-282
Visualization and Quantitative Analysis on Fuel Vapour Concentration in a Diesel Spray....Pages 283-294
Flame and Turbulence Interactions in a Four-Stroke SI Engine....Pages 295-314
Spray Transport and Mixing in Spark Ignition Engines: Some Modelling and Experimental Trends....Pages 315-332
In-Cylinder Diagnostics for Production Spark Ignition Engines....Pages 333-368
Cyclic Variation Due to Misfiring in a Small Two-Stroke Engine....Pages 369-381
Cycle-Resolved Two-Dimensional Laser-Induced Fluorescence Measurements of Fuel/Air Ratio Correlated to Early Combustion in a Spark-Ignition Engine....Pages 383-389
Front Matter....Pages 391-391
Laser Diagnostics for Temperature and Species in Unsteady Combustion....Pages 393-410
Mathematical Modeling of Turbulent Flames....Pages 411-491
The Modeling of Combustion and Pollutant Formation in Engine Flows....Pages 493-512
Front Matter....Pages 391-391
Modeling of Turbulent Combustion for I.C. Engines: Classical Models and Recent Developments....Pages 513-542
Some Effects of Density Variations in Turbulent Flows with Pressure Fluctuations....Pages 543-551
Back Matter....Pages 553-561

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Unsteady Combustion is divided into three parts: combustion-induced oscillations; internal combustion engines; and experimental techniques and modelling. Part 1 of the book deals with combustion instabilities, pulsed combustors, and active control of unsteady motions, and constitutes an excellent survey of the range of problems central to combustion instabilities.
Internal combustion engines will undoubtedly be the prime movers in ground transportation for many years, if not decades to come. The major problems in practice are fuel efficiency and the emission of pollutants: all of the papers in Part 2 address these two problems.
The third part of the book deals with quite general laser diagnostics and modelling aspects, including computer simulations which, while a young subject, hold out the promise of a long and important future.
Content:
Front Matter....Pages i-viii
Front Matter....Pages ix-ix
Unsteady Flames and the Rayleigh Criterion....Pages 1-16
Premixed Combustion in a Periodic Flow Field....Pages 17-32
An Experimental and Numerical Investigation of Premixed Combustion in a Vortex in a Laboratory Dump Combustor....Pages 33-69
The influence of Fuel/Air Mixture Oscillations on the Formation of Self-Sustained Combustion Instabilities in Premixed Combustion Systems....Pages 71-82
Some Modeling Methods of Combustion Instabilities....Pages 83-112
Pulse Combustion Applications: Past, Present and Future....Pages 113-137
Recent Progress in the Implementation of Active Combustion Control....Pages 139-160
Suppression of Combustion Oscillation of Premixed Flames by Active Control....Pages 161-171
Combustion Instabilities in Propulsion Systems....Pages 173-241
Aircraft Turbine Engine NOx Emission Abatement....Pages 243-264
Front Matter....Pages 265-265
Diagnostics of Diesel Combustion....Pages 267-282
Visualization and Quantitative Analysis on Fuel Vapour Concentration in a Diesel Spray....Pages 283-294
Flame and Turbulence Interactions in a Four-Stroke SI Engine....Pages 295-314
Spray Transport and Mixing in Spark Ignition Engines: Some Modelling and Experimental Trends....Pages 315-332
In-Cylinder Diagnostics for Production Spark Ignition Engines....Pages 333-368
Cyclic Variation Due to Misfiring in a Small Two-Stroke Engine....Pages 369-381
Cycle-Resolved Two-Dimensional Laser-Induced Fluorescence Measurements of Fuel/Air Ratio Correlated to Early Combustion in a Spark-Ignition Engine....Pages 383-389
Front Matter....Pages 391-391
Laser Diagnostics for Temperature and Species in Unsteady Combustion....Pages 393-410
Mathematical Modeling of Turbulent Flames....Pages 411-491
The Modeling of Combustion and Pollutant Formation in Engine Flows....Pages 493-512
Front Matter....Pages 391-391
Modeling of Turbulent Combustion for I.C. Engines: Classical Models and Recent Developments....Pages 513-542
Some Effects of Density Variations in Turbulent Flows with Pressure Fluctuations....Pages 543-551
Back Matter....Pages 553-561
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