| Description |
1 online resource (xviii, 216 pages) : illustrations (some color) |
| Series |
Springer theses, 2190-5053 |
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Springer theses, 2190-5053
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| Contents |
880-01 Intro; Supervisorś Foreword; Preface; Contents; Symbols, Subscripts, and Abbreviations; Chapter 1: Introduction; 1.1 Greenhouse Emission; 1.2 Emission Regulation and Penalties; 1.3 Ultra-lean Combustion Strategies; 1.4 Ignition as Limit Phenomena; 1.5 Natural Gas and Hydrogen; 1.6 Background on Hot Turbulent Jet Ignition; 1.7 Literature Review; 1.8 Research Motivation and Objectives; References; Chapter 2: Ignition Mechanisms; 2.1 Introduction; 2.2 Experimental Methods; 2.2.1 Apparatus; 2.2.2 Diaphragm Rupture Assessment; 2.2.3 High-Speed Schlieren and OH* Chemiluminescence Imaging |
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880-01/(S Mach NumberShock Structures; Velocity and Vorticity; Species Concentration; Temperature; 4.4.2.4 Damköhler Number; 4.4.2.5 Burning Time of the Main Chamber Mixture; 4.5 Conclusions; References; Chapter 5: Combustion Instability at Lean Limit; 5.1 Introduction; 5.2 Experimental Method; 5.3 Mathematical Modeling; 5.3.1 Modeling of Combustion Instability; 5.3.2 Combustion Response Models; 5.3.2.1 Model 1: Croccoś n -- τ Model; 5.3.2.2 Model 2: Velocity Lag Model; 5.4 Results and Discussion; 5.4.1 Self-Excited Oscillations of Hot Jet; 5.4.2 Effect of Pre-chamber Equivalence Ratio |
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2.3 Results and Discussions2.3.1 Flame Ignition (Ignition by a Reacting Jet) Mechanism; 2.3.2 Jet Ignition (Ignition by a Reacted Jet) Mechanism; 2.3.3 Parametric Effects on Ignition Mechanisms and Ignition Probability; 2.3.4 Jet Characteristics and the Global Damköhler Number; 2.3.5 Turbulent Premixed Combustion Regimes for Hot Jet Ignition; 2.4 Conclusions; References; Chapter 3: Schlieren Image Velocimetry (SIV); 3.1 Introduction; 3.2 Experimental Methods; 3.2.1 High-Speed Schlieren and Shadowgraph Imaging; 3.2.2 PIV Imaging; 3.2.3 Calibration; 3.3 Data Analysis Techniques |
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3.3.1 Data Preprocessing Parameters3.3.1.1 ̀̀Particle ́́Image Size and ̀̀Particle ́́Density; 3.3.1.2 Inverse Abel Transformation; 3.3.1.3 Image Filtering; 3.3.2 Data Processing Parameters; 3.3.3 Data Post-processing Parameters; 3.3.3.1 Validation of Velocity Field; 3.4 Results and Discussion; 3.4.1 Helium Jet Results; 3.4.2 Correlation Planes; 3.4.3 PPR, PCE, and SNR PDF; 3.5 Conclusions; References; Chapter 4: Supersonic Jet Ignition; 4.1 Introduction; 4.2 Experimental Method; 4.2.1 Supersonic Nozzle Designs; 4.2.2 High-Speed Schlieren and OH* Imaging |
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4.2.3 Hot-Wire Pyrometry and Infrared Imaging4.2.4 Schlieren Image Velocimetry; 4.3 Numerical Method; 4.3.1 Simulation Domain and Boundary Conditions; 4.3.2 Governing Equations; 4.3.3 Turbulence Modeling; 4.3.4 Chemistry Modeling; 4.3.5 Numerical Details; 4.4 Results and Discussions; 4.4.1 Experimental Results; 4.4.1.1 Lean Flammability Limit and Ignition Delay; 4.4.1.2 Visualization of Ignition Processes in Main Chamber; 4.4.1.3 Infrared Measurements; 4.4.2 Numerical Results; 4.4.2.1 Validation; 4.4.2.2 Flame Propagation Process in the Pre-chamber; 4.4.2.3 Characteristics of the Hot Jet |
| Summary |
This book focuses on developing strategies for ultra-lean combustion of natural gas and hydrogen, and contributes to the research on extending the lean flammability limit of hydrogen and air using a hot supersonic jet. The author addresses experimental methods, data analysis techniques, and results throughout each chapter and: Explains the fundamental mechanisms behind turbulent hot jet ignition using non-dimensional analysis Explores ignition characteristics by impinging hot jet and multiple jets in relation to better controllability and lean combustion Explores how different instability modes interact with the acoustic modes of the combustion chamber. This book provides a potential answer to some of the issues that arise from lean engine operation, such as poor ignition, engine misfire, cycle-to-cycle variability, combustion instability, reduction in efficiency, and an increase in unburned hydrocarbon emissions. This thesis was submitted to and approved by Purdue University |
| Bibliography |
Includes bibliographical references and index |
| Notes |
Online resource; title from PDF title page (SpringerLink, viewed May 7, 2018) |
| Subject |
Airplanes -- Motors -- Ignition.
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Jet engines -- Combustion chambers.
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Mechanics of fluids.
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Alternative & renewable energy sources & technology.
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Aerospace & aviation technology.
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TECHNOLOGY & ENGINEERING -- Mechanical.
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Airplanes -- Motors -- Ignition
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Jet engines -- Combustion chambers
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| Form |
Electronic book
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| ISBN |
9783319762432 |
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3319762435 |
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