IUTAM Symposium on Combustion in Supersonic Flows : Proceedings of the IUTAM Symposium Held in Poitiers, France, 2–6 October 1995

This volume contains selected presentations of the IUTAM Symposium on `Combustion in Supersonic Flows' held in Poitiers at the Ecole Nationale Supérieure de Mécanique et d'Aérotechnique (ENSMA) from 2 to 6 October 1995. The presentations focus on four main topics related to combustion in supersonic streams and practical issues relevant to the development of new propulsion systems: fundamental studies of premixed and unpremixed combustion, fluid dynamics aspects of supersonic combustion, practical systems including Scramjet, Ramaccelerators and Pulsed Detonation Engines, and the application of detonation to propulsion. Important progress has been made in the understanding of local mechanisms which allow combustion to be stabilized in a supersonic flow; in particular, various mechanisms controlled by mixing, chemical kinetics, viscous heating and shock waves are now well identified. Despite the difficulty of developing experimental work on supersonic combustion, a good set of experimental data is now available, allowing validation of theoretical analysis and models. The main aspects of modelling of turbulent combustion in high speed flows were discussed, including the influence of turbulent fluctuations on the chemistry-controlled phase of combustion and the applicability of flamelet models to high speed flows. The full range of numerical approaches is covered including Direct Numerical Simulation, Large Eddy Simulation, k-epsilon and shock tracking methods. A considerable effort has been made to generalize these methods to the treatment of supersonic reactive flows and to develop new numerical methods taking into account the most recent theoretical work and a better understanding of the underlying physics. Front Matter....Pages i-xvii Front Matter....Pages xix-xix Observations Concerning Supersonic Combustion....Pages 1-11 Front Matter....Pages 13-13 Some Generic Problems Related to Combustion of Hydrogen and Air in Supersonic Flows....Pages 15-42 Development of a Three-Dimensional Code to Investigate Supersonic-Combustion Problems....Pages 43-50 Influence of Turbulent Fluctuations on the Induction Period of Hydrogen-Air Combustion Reaction....Pages 51-60 Shock Induced Combustion Over a Rectangular Ramp....Pages 61-70 Optical Measurements of Hydrogen Mixing in Supersonic Airflows....Pages 71-79 A New L.E.S. Approach to Simulate Cheng’s Experiment....Pages 81-93 Flame-Holding Behind a Wedge by Incident Shock Waves....Pages 95-110 Effects of Laminar Flamelet Structures on Supersonic Turbulent Combustion....Pages 111-117 Numerical Study of Auto-Ignition and Combustion in Supersonic Hydrogen-Air Mixing Layer....Pages 119-134 Experiments on the Flame - Holding Mechanism of a Newly Devised Strut in Supersonic Airflow....Pages 135-144 Front Matter....Pages 145-145 Scramjet Engine Tests at Mach 4 and 6....Pages 147-162 An industrial point of view on scramjet combustor design....Pages 163-172 Shock Tube Investigations of H 2 Combustion in a High Temperature Supersonic Air Flow. (Scramjet)....Pages 173-184 Front Matter....Pages 185-185 Detonation of the Gas Mixtures with Inert Solid Particles....Pages 187-191 Catalytic Combustion in a Cold Supersonic Flow of Hydrogen-Air Premixture....Pages 193-200 Front Matter....Pages 201-201 Pulsed Detonation Engine: Key Issues....Pages 203-218 The Ram Accelerator: Perspectives and Experimental Results Already Achieved....Pages 219-236 Numerical Simulations of Unstart Phenomenon in Ramac Device....Pages 237-248 The Effects of Two-Phase Combustion in Ram Accelerator....Pages 249-262 Front Matter....Pages 201-201 The 30-mm-Caliber Scram Accelerator RAMAC 30 of ISL....Pages 263-272 Expansion Tube Experiments for the Investigation of Ram-Accelerator-Related Phenomena....Pages 273-284 The PDWA Concept for Hypersonic Propulsion....Pages 285-297 Front Matter....Pages 299-299 Mixing Enhancement by Normal Gas Injection in Supersonic Mixing Layer....Pages 301-308 Properties of Energetic Scales in a Supersonic Mixing Layer....Pages 309-316 Numerical Simulations of Shock-Turbulence Interactions....Pages 317-324 LDV Investigation of Turbulence Phenomena in Multiple Shock Wave/Turbulent Boundary Layer Interactions....Pages 325-332 Front Matter....Pages 333-333 Galloping Detonations....Pages 335-345 Numerical Simulations of a Marginal Detonation: Wave Velocities and Transverse Wave Structure....Pages 347-358 Direct Initiation of Gaseous Detonation by Interacting Supersonic Jets....Pages 359-363 Onset of Oblique H 2 -Air Detonations Enhanced by a Turbulent Jet....Pages 365-374 Dynamics of Curved Detonation Front and Critical Conditions for Detonation Initiations....Pages 375-403 Initiation of Detonation by Mixing of Supersonic Acetylene and Oxygen Jets....Pages 405-409 Back Matter....Pages 411-412