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Applications of Turbulent and Multi-Phase Combustion

ISBN: 978-1-118-12756-8
600 pages
May 2012
Applications of Turbulent and Multi-Phase Combustion (1118127560) cover image

A hands-on, integrated approach to solving combustion problems in diverse areas

An understanding of turbulence, combustion, and multiphase reacting flows is essential for engineers and scientists in many industries, including power genera-tion, jet and rocket propulsion, pollution control, fire prevention and safety, and material processing. This book offers a highly practical discussion of burning behavior and chemical processes occurring in diverse materials, arming readers with the tools they need to solve the most complex combustion problems facing the scientific community today. The second of a two-volume work, Applications of Turbulent and Multiphase Combustion expands on topics involving laminar flames from Professor Kuo's bestselling book Principles of Combustion, Second Edition, then builds upon the theory discussed in the companion volume Fundamentals of Turbulent and Multiphase Combustion to address in detail cutting-edge experimental techniques and applications not covered anywhere else.

Special features of this book include:

  • Coverage of advanced applications such as solid propellants, burning behavior, and chemical boundary layer flows

  • A multiphase systems approach discussing basic concepts before moving to higher-level applications

  • A large number of practical examples gleaned from the authors' experience along with problems and a solutions manual

Engineers and researchers in chemical and mechanical engineering and materials science will find Applications of Turbulent and Multiphase Combustion an indispensable guide for upgrading their skills and keeping up with this rapidly evolving area. It is also an excellent resource for students and professionals in mechanical, chemical, and aerospace engineering.

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Preface xvii

1 Solid Propellants and Their Combustion Characteristics 1

1.1 Background of Solid Propellant Combustion, 4

1.1.1 Definition of Solid Propellants, 4

1.1.2 Desirable Characteristics of Solid Propellants, 4

1.1.3 Calculation of Oxygen Balance, 5

1.1.4 Homogeneous Propellants, 6 Decomposition Characteristics of NC, 6

1.1.5 Heterogeneous Propellants (or Composite Propellants), 7

1.1.6 Major Types of Ingredients in Solid Propellants, 8 Description of Oxidizer Ingredients, 10 Description of Fuel Binders, 12 Curing and Cross-Linking Agents, 14 Aging, 15

1.1.7 Applications of Solid Propellants, 16 Hazard Classifications of Solid Propellants, 16

1.1.8 Material Characterization of Propellants, 16 Propellant Density Calculation, 16 Propellant Mass Fraction, 17 Viscoelastic Behavior of Solid Propellants, 17

1.1.9 Thermal Profile in a Burning Solid Propellant, 18 Surface and Subsurface Temperature Measurements of Solid Propellants, 18 Interfacial Energy Flux Balance at the Solid Propellant Surface, 20 Energy Equation for the Gas Phase, 21 Burning Rate of Solid Propellants, 23 Temperature Sensitivity of Burning Rate, 25 Measurement of Propellant Burning Rate by Using a Strand Burner, 26 Measurement of Propellant Burning Rate by Using a Small-Scale Motor, 37 Burning Rate Temperature Sensitivity of Neat Ingredients, 41

1.2 Solid-Propellant Rocket and Gun Performance Parameters, 43

1.2.1 Performance Parameters of a Solid Rocket Motor, 44 Thrust of a Solid Rocket Motor, 44 Specific Impulse of a Solid Rocket Motor, 48 Density-Specific Impulse, 56 Effective Vacuum Exhaust Velocity, 58 Characteristic Velocity C ∗, 58 Pressure Sensitivity of Burning Rate, 59 Thrust Coefficient Efficiency, 60 Effect of Pressure Exponent on Stable/Unstable Burning in Solid Rocket Motor, 60

1.2.2 Performance Parameters of Solid-Propellant Gun Systems, 61 Energy Balance Equation, 64 Efficiencies of Gun Propulsion Systems, 67 Heat of Explosion (Ho ex), 69 Relative Quickness, Relative Force, and Deviations in Muzzle Velocity, 70 Dynamic Vivacity, 71

2 Thermal Decomposition and Combustion of Nitramines 72

2.1 Thermophysical Properties of Selected Nitramines, 76

2.2 Polymorphic Forms of Nitramines, 78

2.2.1 Polymorphic Forms of HMX, 80

2.2.2 Polymorphic Forms of RDX, 82

2.3 Thermal Decomposition of RDX, 88

2.3.1 Explanation of Opposite Trends on α- and β-RDX Decomposition with Increasing Pressure, 90

2.3.2 Thermal Decomposition Mechanisms of RDX, 92 Homolytic N–N Bond Cleavage, 92 Concerted Ring Opening Mechanism of RDX, 94 Successive HONO Elimination Mechanism of RDX, 96 Analysis of Three Decomposition Mechanisms, 104

2.3.3 Formation of Foam Layer Near RDX Burning Surface, 106

2.4 Gas-Phase Reactions of RDX, 109

2.4.1 Development of Gas-Phase Reaction Mechanism for RDX Combustion, 111

2.5 Modeling of RDX Monopropellant Combustion with Surface Reactions, 125

2.5.1 Processes in Foam-Layer Region, 126

2.5.2 Reactions Considered in the Foam Layer, 128

2.5.3 Evaporation and Condensation Consideration for RDX, 128

2.5.4 Boundary Conditions, 130

2.5.5 Numerical Methods Used for RDX Combustion Model with Foam Layer, 131

2.5.6 Predicted Flame Structure, 132

3 Burning Behavior of Homogeneous Solid Propellants 143

3.1 Common Ingredients in Homogeneous Propellants, 147

3.2 Combustion Wave Structure of a Double-Base Propellant, 148

3.3 Burning Rate Behavior of a Double-Base Propellant, 149

3.4 Burning Rate Behavior of Catalyzed Nitrate-Ester Propellants, 155

3.5 Thermal Wave Structure and Pyrolysis Law of Homogeneous Propellants, 158

3.5.1 Dark Zone Residence Time Correlation, 166

3.6 Modeling and Prediction of Homogeneous Propellant Combustion Behavior, 167

3.6.1 Multi-Ingredient Model of Miller and Anderson, 171 NC: A Special Case Ingredient, 172 Comparison of Calculated Propellant Burning Rates with the Experimental Data, 175

3.7 Transient Burning Characterization of Homogeneous Solid Propellant, 187

3.7.1 What is Dynamic Burning?, 188

3.7.2 Theoretical Models for Dynamic Burning, 190 dp/dt Approach, 193 Flame Description Approach, 194 Zel’dovich Approach, 194 Characterization of Dynamic Burning of JA2 Propellant Using the Zel’dovich Approach, 196 Experimental Measurement of Dynamic Burning Rate of JA2 Propellant, 201 Novozhilov Stability Parameters, 202 Novozhilov Stability Parameters for JA2 Propellant, 203 Some Problems Associated with Dynamic Burning Characterization, 205 Factors Influencing Dynamic Burning, 207

Chapter Problems, 208

4 Chemically Reacting Boundary-Layer Flows 209

4.1 Introduction, 210

4.1.1 Applications of Reacting Boundary-Layer Flows, 211

4.1.2 High-Temperature Experimental Facilities Used in Investigation, 211

4.1.3 Theoretical Approaches and Boundary-Layer Flow Classifications, 212

4.1.4 Historical Survey, 212

4.2 Governing Equations for Two-Dimensional Reacting Boundary-Layer Flows, 216

4.3 Boundary Conditions, 221

4.4 Chemical Kinetics, 224

4.4.1 Homogeneous Chemical Reactions, 224

4.4.2 Heterogeneous Chemical Reactions, 226

4.5 Laminar Boundary-Layer Flows with Surface Reactions, 229

4.5.1 Governing Equations and Boundary Conditions, 229

4.5.2 Transformation to (ξ, η) Coordinates, 229

4.5.3 Conditions for Decoupling of Governing Equations and Self-Similar Solutions, 232

4.5.4 Damk¨ohler Number for Surface Reactions, 233

4.5.5 Surface Combustion of Graphite Near the Stagnation Region, 234

4.6 Laminar Boundary-Layer Flows With Gas-Phase Reactions, 239

4.6.1 Governing Equations and Coordinate Transformation, 239

4.6.2 Damk¨ohler Number for Gas-Phase Reactions, 240

4.6.3 Extension to Axisymmetric Cases, 242

4.7 Turbulent Boundary-Layer Flows with Chemical Reactions, 243

4.7.1 Introduction, 243

4.7.2 Boundary-Layer Integral Matrix Procedure of Evans, 243 General Conservation Equations, 243 Molecular Transport Properties, 247 Turbulent Transport Properties, 251 Equation of State, 256 Integral Matrix Solution Procedure, 256 Limitations of the BLIMP Analysis, 257

4.7.3 Marching-Integration Procedure of Patankar and Spalding, 257 Description of the Physical Model, 258 Conservation Equations for the Viscous Region, 258 Modeling of the Gas-Phase Chemical Reactions, 259 Governing Equations for the Inviscid Region, 260 Boundary Conditions, 261 Near-Wall Treatment of ˜k and ˜ε, 262 Coordinate Transformation and Solution Procedure of Patankar and Spalding, 263 Comparison of Theoretical Results with Experimental Data, 266

4.7.4 Metal Erosion by Hot Reactive Gases, 272

4.7.5 Thermochemical Erosion of Graphite Nozzles of Solid Rocket Motors, 281 Graphite Nozzle Erosion Minimization Model and Code, 283 Governing Equations, 286 Heterogeneous Reaction Kinetics, 290 Results from the GNEM Code, 293 Nozzle Erosion Rate by Other Metallized Propellant Products, 312

4.7.6 Turbulent Wall Fires, 316 Development of the Ahmad-Faeth Correlation, 321

5 Ignition and Combustion of Single Energetic Solid Particles 330

5.1 Why Energetic Particles Are Attractive for Combustion Enhancement in Propulsion, 335

5.2 Metal Combustion Classification, 336

5.3 Metal Particle Combustion Regimes, 341

5.4 Ignition of Boron Particles, 344

5.5 Experimental Studies, 351

5.5.1 Gasification of Boron Oxides, 352

5.5.2 Chemical Kinetics Measurement, 353

5.5.3 Boron Ignition Combustion in a Controlled Hot Gas Environment, 354

5.6 Theoretical Studies of Boron Ignition and Combustion, 362

5.6.1 First-Stage Combustion Models, 362

5.6.2 Second-Stage Combustion Models, 365

5.6.3 Chemical Kinetic Mechanisms, 365

5.6.4 Methods for Enhancement of Boron Ignition, 367

5.6.5 Verification of Diffusion Mechanism of Boron Particle Combustion, 369

5.6.6 Chemical Identification of the Boron Oxide Layer, 371

5.7 Theoretical Model Development of Boron Particle Combustion, 372

5.7.1 First-Stage Combustion Model, 372

5.7.2 Second-Stage Combustion Model, 377

5.7.3 Comparison of Predicted and Measured Combustion Times, 381

5.8 Ignition and Combustion of Boron Particles in Fluorine-Containing Environments, 384

5.8.1 Multidiffusion Flat-Flame Burner, 385

5.8.2 Test Conditions, 387

5.8.3 Experimental Results and Discussions, 388

5.8.4 Surface Reaction of (BO)n with HF(g), 393

5.8.5 Surface Reaction of (BO)n with F(g), 394

5.8.6 Governing Equations During the First-Stage Combustion of Boron Particles, 395

5.8.7 Model for the “Clean” Boron Consumption Process (Second-Stage Combustion), 396 Chemical Kinetics During Second-Stage Combustion, 397 Consideration of Both Kinetics- and Diffusion-Controlled Second-Stage Combustion, 402 Governing Equations During the Second-Stage Combustion of Boron Particles, 403

5.8.8 Numerical Solution, 403 Comparison with Experimental Data in Oxygen-Containing (Nonfluorine) Environments, 404 Comparison with Experimental Data and Model Predictions in Fluorine-Containing Environments, 405

5.9 Combustion of a Single Aluminum Particle, 410

5.9.1 Background, 413

5.9.2 Physical Model, 414

5.9.3 Aluminum-Combustion Mechanism, 417

5.9.4 Condensation Aspect of Model of Beckstead et al. (2005), 419

5.9.5 General Mathematical Model, 422

5.9.6 Boundary Conditions, 424

5.9.7 Dn Law in Aluminum Combustion, 429

5.10 Ignition of Aluminum Particle in a Controlled Postflame Zone, 437

5.11 Physical Concepts of Aluminum Agglomerate Formation, 439

5.11.1 Evolution Process of Condensed-Phase Combustion Products, 440

5.12 Combustion Behavior for Fine and Ultrafine Aluminum Particles, 443

5.12.1 10 μm Aluminum Particle—Early Transitional Structure, 444

5.12.2 100 nm Aluminum Particle—Late Transitional Structure, 446

5.13 Potential Use of Energetic Nanosize Powders for Combustion and Rocket Propulsion, 447

Chapter Problems, 452

Project No. 1, 452

Project No. 2, 454

6 Combustion of Solid Particles in Multiphase Flows 456

6.1 Void Fraction and Specific Particle Surface Area, 462

6.2 Mathematical Formulation, 463

6.2.1 Formulation of the Heat Equation for a Single Particle, 469

6.3 Method of Characteristics Formulation, 472

6.3.1 Linearization of the Characteristic Equations, 476

6.4 Ignition Cartridge Results, 477

6.5 Governing Equations for the Mortar Tube, 484

6.5.1 Initial Conditions, 488 Initial Condition for Velocity, 488 Initial Condition for Porosity, 488 Initial Condition for Temperature and Pressure, 488

6.5.2 Boundary Conditions, 488 On the Surface of Ignition Cartridge in Vent-Hole Region, 489 In the Fin Region, 489 The z -direction Boundary Conditions, 489

6.5.3 Numerical Methods for Mortar Region Model, 490

6.6 Predictions of Mortar Performance and Model Validation, 491

6.7 Approximate Riemann Solver: Roe-Pike Method, 496

6.8 Roe’s Method, 499

6.9 Roe-Pike Method, 501

6.10 Entropy Condition and Entropy Fix, 502

6.11 Flux Limiter, 503

6.12 Higher Order Correction, 504

6.13 Three-Dimensional Wave Propagation, 504

Appendix A: Useful Vector and Tensor Operations 507

Appendix B: Constants and Conversion Factors Often Used in Combustion 534

Appendix C: Naming of Hydrocarbons 538

Appendix D: Particle Size–U.S. Sieve Size and Tyler Screen Mesh Equivalents 541

Bibliography 544

Index 571

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Kenneth K. Kuo is Distinguished Professor of Mechanical Engineering and Director of the High Pressure Combustion Laboratory (HPCL) in the Department of Mechanical and Nuclear Engineering of the College of Engineering at The Pennsylvania State University.??Professor Kuo established the HPCL and is recognized as one of the leading researchers and experts in propulsion-related combustion.

Ragini Acharya is Senior Research Scientist at United Technologies Research Center. She received her PhD from The Pennsylvania State University in 2008. Dr. Acharya's research expertise includes development of multiphysics, multiscale, multiphase models, fire dynamics, numerical methods, and scientific computing. She has authored or coauthored multiple technical articles in these areas.

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