Sun / Wang / Cai Unsteady Supersonic Combustion

1. Auflage 2020
ISBN: 978-981-15-3595-6
Verlag: Springer Nature Singapore
Format: PDF
Kopierschutz: 1 - PDF Watermark

E-Book, Englisch, 380 Seiten

This book describes the unsteady phenomena needed to understand supersonic combustion. Following an initial chapter that introduces readers to the basic concepts in and classical studies on unsteady supersonic combustion, the book highlights recent studies on unsteady phenomena, which offer insights on e.g. interactions between acoustic waves and flames, flow dominating instability, ignition instability, flame flashback, and near-blowout-limit combustion. In turn, the book discusses in detail the fundamental mechanisms of these phenomena, and puts forward practical suggestions for future scramjet design.

Prof. Mingbo Sun is the Director of Science and Technology on Scramjet Laboratory at National University of Defense Technology (NUDT) in China. He was awarded a Doctorate in Aerospace Science and Technology from NUDT (2008) and a bachelor's degree in Aerodynamic Engineering from NUDT (2002). His Ph.D. thesis entitled 'Studies on Flow Patterns and Flameholding Mechanisms of Cavity Flameholders in Supersonic Flows' was rated as outstanding doctoral dissertation. He started his research career as a Lecturer at NUDT from 2008 and was promoted to a Professor in Science and Technology on Scramjet Laboratory in 2014. He has been working on experimental and numerical studies of the supersonic flow/combustion in scramjet engines in the past 15 years. He was awarded the National Science Fund for Distinguished Young Scholars for his outstanding research in supersonic combustion. He authored over 100 SCI-indexed journal papers and 16 patents. Dr. Hongbo Wang is an Associate Professor at National University of Defense Technology (NUDT) in China. He was awarded a Doctorate in Aerospace Science and Technology from NUDT (2012), Master of Science degree in Aerospace Science and Technology from NUDT (2007) and a bachelor's degree in Aerodynamic Engineering from NUDT (2005). He used to be a visiting Ph.D. student in Aerospace Engineering at the University of Sheffield (UK) from 2009 to 2010. His Ph.D. thesis entitled 'Combustion Modes and Oscillation Mechanisms of Cavity-Stabilized Jet Combustion in Supersonic Flows' was rated as outstanding doctoral dissertation. He started his Hypersonic Propulsion Technology research career working as a Lecturer at NUDT from 2012. He conducted research in the areas of scramjet combustor design, supersonic combustion and computational fluid/combustion dynamics. He authored over 50 publications in journals and several patents. Dr. Zun Cai is a Lecturer at National University of Defense Technology in China. He was awarded a Doctorate in Aerospace Science and Technology from NUDT (2018), Master of Science degree in Aerospace Science and Technology from NUDT (2014) and a bachelor's degree in Aerodynamic Engineering from NUDT (2012). He used to be a visiting Ph.D. student in Computational Fluid Dynamics at the University of Lund (Sweden) from 2015 to 2016, during which he developed a supersonic combustion solver based on the OpenFOAM. His Ph.D. thesis entitled 'Investigation on the Flame Ignition and Stabilization Processes in a Cavity-based Scramjet Combustor with a Rear-wall-expansion Geometry' was rated as outstanding doctoral dissertation. He started his Hypersonic Propulsion Technology research career working as a Lecturer at NUDT from 2018 and conducted research in the areas of scramjet combustor design, supersonic combustion and RBCC propulsion issues. He authored over 20 publications in journals and several patents. Dr. Jiajian Zhu is an Associate Professor at National University of Defense technology (NUDT) in China. He was awarded a Doctorate in Combustion Physics from Lund University in Sweden (2015) and a bachelor's degree in Opto-electronic Engineering from NUDT in China (2009). He was employed as a Lecturer by the Science and Technology on Scramjet Laboratory, NUDT, in 2015 and promoted to an Associate Professor in 2018. His present research focus is supersonic combustion and laser-based combustion diagnostics. He was supported by the Huxiang Youth Talent Program and co-authored over 40 journal publications.

Autoren/Hrsg.

Sun, Mingbo

Wang, Hongbo

Cai, Zun

Zhu, Jiajian

Inhaltsverzeichnis

1;Preface;7
2;Acknowledgements;9
3;Contents;10
4;About the Authors;14
5;Nomenclature;16
6;List of Figures;20
7;List of Tables;37
8;1 Introduction;39
8.1;1.1 Interactions Between Acoustic Wave and Flame;40
8.1.1;1.1.1 Fundamentals of the Coupling Between Acoustic Wave and Combustion Process;41
8.1.2;1.1.2 Classification of Combustion Instability Related to Acoustic Wave;43
8.1.3;1.1.3 Acoustic Induced Combustion Instabilities in Supersonic Flows;46
8.1.4;1.1.4 Summary;49
8.2;1.2 Flow Dominating Instability;49
8.2.1;1.2.1 Low-Frequency Unsteadiness of Shock Wave/Turbulent Boundary Layer Interaction;49
8.2.2;1.2.2 Unsteadiness of Shock-Induced Separation in Non-reacting Flow;52
8.2.3;1.2.3 Unsteady Combustion Dominated by Flow Instability;56
8.2.4;1.2.4 Summary;60
8.3;1.3 Ignition;60
8.3.1;1.3.1 Basic Concepts for the Forced Ignition;60
8.3.2;1.3.2 Effects of the Forced Ignition Methods;62
8.3.3;1.3.3 Effects of Auto-Ignition;67
8.3.4;1.3.4 Summary;70
8.4;1.4 Flame Flashback;70
8.4.1;1.4.1 Flashback Due to DDT (Deflagration–Detonation Transition);70
8.4.2;1.4.2 Flashback Due to Boundary Layer Separation;71
8.4.3;1.4.3 Flashback Due to Thermal Choking and Acoustic Instabilities;76
8.4.4;1.4.4 Summary;76
8.5;1.5 Combustion Near Blowout Limits;78
8.5.1;1.5.1 Blowout Limits;78
8.5.2;1.5.2 Combustion Behaviors Near Blowout Limits;80
8.5.3;1.5.3 Summary;82
8.6;1.6 Discussion;83
8.7;References;85
9;2 Acoustic Oscillation in Supersonic Combustor;94
9.1;2.1 High Frequency Acoustic Oscillations of Cavity;94
9.1.1;2.1.1 Characteristics of Oscillations in Supersonic Cavity Flows;94
9.1.2;2.1.2 Characteristics of Oscillations in Supersonic Cavity Combustion;107
9.2;2.2 Low Frequency Acoustic Oscillation;121
9.2.1;2.2.1 Effect of Cavity Parameters on the Acoustic Oscillation;122
9.2.2;2.2.2 Effect of Mixing Status on the Acoustic Oscillation;131
9.2.3;2.2.3 Numerical Analysis on Acoustic Oscillation;136
9.3;2.3 Summary;147
9.4;References;148
10;3 Flow Dominating Instability in Supersonic Flows;150
10.1;3.1 Asymmetric and Dynamic Combustion Behaviors in Strong Separated Flows;150
10.1.1;3.1.1 Experimental Setup and Numerical Methodology for High-Temperature Cases;151
10.1.2;3.1.2 Combustion Characteristics Under Different Equivalence Ratios;153
10.1.3;3.1.3 Dynamic Combustion Under Intermediate Heat Release;156
10.2;3.2 Decoupling Analysis of the Unsteady Combustion;160
10.2.1;3.2.1 Impact Factors of the Separation Dominating Unsteady Combustion;162
10.2.2;3.2.2 Dynamic Behaviors in High-Temperature Separated Flow Induced by Backpressure;168
10.3;3.3 Cold Flow Analysis: Asymmetric Separation Induced by Boundary Layer Transformation;172
10.3.1;3.3.1 Experimental Setup and Numerical Methodology for Cold Flow Cases;173
10.3.2;3.3.2 Backpressure Induced Symmetric and Asymmetric Separated Flowfield;176
10.3.3;3.3.3 Mechanism of Asymmetric Separation Based on Boundary Layer Study;182
10.4;3.4 Cold Flow Analysis: Separation Transition and Low-Frequency Unsteadiness;185
10.4.1;3.4.1 Symmetric/Asymmetric Separation Transition Under Threshold Backpressure;186
10.4.2;3.4.2 Mechanism of Separation Pattern Transition;193
10.4.3;3.4.3 Low-Frequency Unsteadiness in the Separated Flowfield;197
10.4.4;3.4.4 Control of Unsteadiness;201
10.5;3.5 Validation on Reactive Flows with Different Geometry;204
10.5.1;3.5.1 Experimental Facility;204
10.5.2;3.5.2 Variation of Combustion Modes Under Different Equivalence Ratios;206
10.5.3;3.5.3 Quantitative Descriptions of Unsteady Combustion;208
10.6;3.6 Summary;211
10.7;References;211
11;4 Cavity Ignition in Supersonic Flows;214
11.1;4.1 Ignition Processes Under Different Ignition Methods;214
11.1.1;4.1.1 Spark Ignition;215
11.1.2;4.1.2 Piloted Ignition;216
11.1.3;4.1.3 Gliding-Arc-Discharge (GAD) Ignition;219
11.1.4;4.1.4 Laser-Induced Plasma (LIP) Ignition;220
11.2;4.2 Flame Behaviors During Ignition;223
11.2.1;4.2.1 Experimental and Numerical Setups;223
11.2.2;4.2.2 Formation of the Flame Kernel;228
11.2.3;4.2.3 Flame Propagation in the Single-Cavity Supersonic Combustor;231
11.2.4;4.2.4 Flame Propagation in the Multi-cavity Supersonic Combustor;234
11.3;4.3 Ignition Mechanism Analysis;244
11.3.1;4.3.1 Experimental and Numerical Setups;245
11.3.2;4.3.2 Four-Stages Dominated Ignition Process;248
11.3.3;4.3.3 Ignition Modes;259
11.4;4.4 Auto-Ignition Effects;266
11.4.1;4.4.1 Experimental Setup;266
11.4.2;4.4.2 Auto-Ignition in the Ignition Process;268
11.5;4.5 Summary;271
11.6;References;273
12;5 Flame Flashback in Supersonic Flows;277
12.1;5.1 Flame Flashback Phenomenon in a Flight Mach 4 Condition;277
12.1.1;5.1.1 Flashback Flame in a Single-Side Expansion Scramjet Combustor;277
12.1.2;5.1.2 Injection Parametric Study in a Single-Side Expansion Scramjet Combustor;283
12.2;5.2 Flame Flashback Phenomenon in a Flight Mach 5.5 Condition;294
12.2.1;5.2.1 Experimental Investigations on Flame Flashback;295
12.2.2;5.2.2 Numerical Investigations of Flame Flashback;316
12.2.3;5.2.3 Theoretical Analyses;331
12.3;5.3 Summary;338
12.4;References;339
13;6 Flame Behaviors Near Blowoff in Supersonic Flows;342
13.1;6.1 Blowoff Limits of Supersonic Combustion;342
13.1.1;6.1.1 Physical Interpretation of Blowoff Limits;342
13.1.2;6.1.2 Modeling of Blowoff Limits;344
13.2;6.2 Mixing and Combustion Characteristics Near Blowoff;346
13.2.1;6.2.1 Interpretation of Blowoff Limits;349
13.2.2;6.2.2 Mixing Characteristics;350
13.2.3;6.2.3 Combustion Characteristics;354
13.3;6.3 Near Blowoff Flame Dynamics;360
13.3.1;6.3.1 Non-premixed Flame;361
13.3.2;6.3.2 Premixed Flame;363
13.4;6.4 Summary;378
13.5;References;379