This book highlights the theories and research progress in gaseous detonation research, and proposes a universal framework theory that overcomes the current research limitations. Gaseous detonation is an extremely fast type of combustion that propagates at supersonic speed in premixed combustible gas. Being self-sustaining and self-organizing with the unique nature of pressure gaining, gaseous detonation and its gas dynamics has been an interdisciplinary frontier for decades. The research of detonation enjoyed its early success from the development of the CJ theory and ZND modeling, but phenomenon is far from being understood quantitatively, and the development of theories to predict the three-dimensional cellular structure remains a formidable task, being essentially a problem in high-speed compressible reacting flow. This theory proposed by the authors’ research group breaks down the limitation of the one-dimensional steady flow hypothesis of the early theories, successfully correlating the propagation and initiation processes of gaseous detonation, and realizing the unified expression of the three-dimensional structure of cell detonation. The book and the proposed open framework is of high value for researchers in conventional applications such as coal mine explosions and chemical plant accidents, and state-of-the-art research fields such as supernova explosion, new aerospace propulsion engines, and detonation-driven hypersonic testing facilities. It is also a driving force for future research of detonation.
Author(s): Zonglin Jiang, Honghui Teng
Series: Shock Wave and High Pressure Phenomena
Publisher: Springer
Year: 2022
Language: English
Pages: 280
City: Singapore
Preface
Contents
1 Introduction
1.1 Origin and Cognition of Gaseous Detonation
1.2 Explosion, Deflagration and Detonation Waves
1.3 Methodology of Gaseous Detonation Research
1.3.1 Experimental Research
1.3.2 Numerical Research
1.3.3 Detonation Theory
1.4 Critical Physical Phenomena of Gaseous Detonation
1.4.1 Detonation Initiation
1.4.2 Wave Structure
1.4.3 Detonation Quenching
1.4.4 Wave Evolution
1.4.5 Stability of Detonation Wave
1.4.6 Gaseous Detonation Application
1.4.7 Motivation of This Book
References
2 Mathematical Equations and Computational Methods
2.1 Fundamental Theories of Gaseous Detonation
2.1.1 Basic Equations
2.1.2 Rayleigh Lines and Hugoniot Curves
2.1.3 Chapman–Jouguet Theory
2.1.4 CJ Detonation Speed
2.2 Chemical Reaction Models
2.2.1 One-Step Irreversible Heat Release Model
2.2.2 Two-Step Induction-Reaction Model
2.2.3 Detailed Chemical Reaction Model
2.3 Computational Fluid Dynamics Methods
2.3.1 Governing Equations
2.3.2 Computational Methods
2.3.3 Acceleration Technologies of Detonation Simulation
2.4 Some Typical Simulation Results
2.5 Concluding Remarks
References
3 Classical Theory of Detonation Initiation and Dynamic Parameters
3.1 CJ Theory and ZND Model
3.2 Deflagration-to-Detonation Transition
3.3 Direct Initiation Through Strong Shock
3.4 Detonation Initiation Theory
3.5 Important Dynamic Parameters
3.6 Relation Among Different Dynamic Parameters
References
4 Unstable Frontal Structures and Propagation Mechanism
4.1 Multiwave Detonation Fronts
4.2 Structure Evolution from Nonequilibrium State
4.3 Reflection and Diffraction of Cellular Detonations
4.4 Cylindrical Expansion Detonations
4.5 Strongly Unstable Detonations
References
5 Universal Framework for Gaseous Detonation Propagation and Initiation
5.1 Introduction
5.2 Mechanisms Underlying Hot Spot Initiation
5.3 Chemical Reaction Zone and Its Evolution
5.4 Critical Initiation State and Its Characteristics
5.5 Equilibrium Propagation State and Its Averaged Features
5.5.1 Mechanisms Underlying Detonation Cell Generation
5.5.2 Supercritical Detonation
5.5.3 Subcritical Detonation
5.6 Averaged Cell Size and Half-Cell Law
5.6.1 Cylindrically Propagating Detonation
5.6.2 Detonation Cell Bifurcation Mechanism
5.6.3 Half-Cell Rule of Detonation Propagation
5.7 Detonation Cell Correlation with Ignition Delay Time
5.7.1 Ignition Delay Time
5.7.2 Cell Size Correlation
5.7.3 Detonation Reaction Modeling
5.8 Applications of the Universal Framework
5.9 Remarks on the Universal Framework
References
6 Structures and Instability of Oblique Detonations
6.1 Conservation Laws and Polar Analysis of Oblique Detonations
6.2 Wave Structure of Initiation Region
6.3 Multiwave Structures on an Unstable Surface
6.4 Oblique Detonation Waves in Nonideal Inflow Conditions
6.5 Effects of Rear Expansion Waves Derived from Finite-Length Wedges
6.6 Effects of Blunt Body on Initiation
6.7 Remarks on Oblique Detonations
References
7 Engineering Application of Gaseous Detonations
7.1 Thermal Analysis of Detonation-Based Combustion Process
7.1.1 Thermal Cycle Efficiency for Isobaric Cycles
7.1.2 Thermal Cycle Efficiency for Isochoric Cycle
7.1.3 Thermal Cycle Efficiency for Detonation Cycle
7.1.4 Comparison of Thermal Cycle Efficiency for Isochoric, Isobaric and Detonative Engines
7.2 Propulsion Technology Based on Detonation Combustion
7.2.1 Pulse Detonation Propulsion Concept
7.2.2 Oblique Detonation Propulsion Concept
7.2.3 Rotating Detonation Propulsion Concept
7.2.4 Key Technologies for Detonation Engines
7.3 Shock Tunnel Driven by Gaseous Detonations
7.3.1 Principles of Detonation-Driving Shock Tube/Tunnel
7.3.2 Development of Detonation-Driving Shock Tunnel
7.3.3 Transient Testing Techniques in High-Enthalpy Shock Tunnels
References
