Author: Jian-Guo LiPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Experimental Studies on Self-ignition of Hydrogen/air Supersonic Combustion
Author: Jian-Guo LiSustained Supersonic Combustion in the Laboratory Under Low Density Conditions
Author: Robert G. DunnPublisher:
ISBN:
Category : Aerodynamics, Supersonic
Languages : en
Pages : 38
Book Description
An investigation of supersonic combustion simulating conditions anticipated in propulsive systems for high altitude, high Mach number flight is described. A unique test facility in operation at the Aerospace Research Laboratories has the capability of simulating supersonic combustion conditions for flight Mach numbers near 12. The facility is considered unique because of its capability of providing conditions under which supersonic combustion can occur at low desities (1-4 psia) with diffusive mixing and with combustion resulting from auto-ignition. Experiments have been conducted with injector/combustor configurations to evaluate the ignition mechanism for axisymmetric streams of hydrogen and air and to evolve a combustion chamber design suitable for experimental study of sustained supersonic combustion. In a parallel theoretical phase, a numberical analysis of the combustion chamber flow field has been made by high speed computer; a parametric study of supersonic combustion in the diffusive hydrogen-air flow field over an air-jet Mach number range of 1.5 to 2.5 and a static pressure range of 1 to 3 psia was accomplished. Experimental data to-date have conclusively established the occurrence of sustained supersonic combustion in the diffusive hydrogen-air flow field at combustor entrance static pressures near 2.5 psia. (Author).
Criteria for Self-ignition of Supersonic Hydrogen-air Mixtures
Author: Paul W. HuberPublisher:
ISBN:
Category : Airplanes
Languages : en
Pages : 64
Book Description
Unsteady Supersonic Combustion
Author: Mingbo SunPublisher: Springer Nature
ISBN: 9811535957
Category : Technology & Engineering
Languages : en
Pages : 380
Book Description
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.
Theoretical and Experimental Investigation of Supersonic Combustion
Author: Antonio FerriPublisher:
ISBN:
Category : Aerodynamics, Transonic
Languages : en
Pages : 136
Book Description
A theoretical and experimental investigation of mixing and supersonic combustion is presented. A review of the problem under investigation is given. Then an analysis of inviscid flow fields with a finite rate chemistry for a hydrogen-air reaction is presented, an an analysis of a turbulent mixing for flows with large density gradients with no chemical reaction is presented. The analysis is compared wit the experimental results. Results of the experiments in upersonic combustion are presented. (Author).
Experimental Results on Supersonic Combustion
Author: J. TAMAGNOPublisher:
ISBN:
Category :
Languages : en
Pages : 1
Book Description
Experiments on spontaneous combustion characteristics of hydrogen injected into a supersonic stream of hot air are described in detail. The results are presented and compared with a theory developed for premixed reactants. The experimental data show that if the initial static temperature and the static pressure of the air stream are high enough then diffusion will be rate controlling and a mixing theory using equilibrium chemistry could be used in analyzing the combustion process. If the chemical reactions are slow, the behavior of the combustion process can be studied as a system where mixing and diffusive effects are absent. The ignition delay times inferred from the initiation of the pressure rise along the burner are in good agreement with those predicted by the empirical correlation. The static temperature exerts a greater influence on the ignition delay time than the static pressure. The static pressure level is an important parameter in determining the time for complete combustion. (Author).
Experimental Studies on Self-Ignition of a Hydrogen Transverse Jet in a Supersonic Free-Stream
Author: 梁國邦Studies of Hydrogen-air Supersonic Combustion at Low Densities
Author: James E. DrewryPublisher:
ISBN:
Category :
Languages : en
Pages : 35
Book Description
An investigation of supersonic combustion as related to propulsive systems for high Mach number, high altitude flight is described. A method of laboratory simulation is employed which is considered to be suitable for fundamental studies of diffusional-controlled supersonic combustion under conditions approaching those of actual flight. A numerical analysis of the mixing and chemical reaction processes in a hydrogen-air ducted flow system was carried out, using a computer code based upon boundary layer concepts and including the effects of finite-rate chemistry. Results of the numerical calculations have indicated the inlet conditions at which auto-ignition is expected to occur within a reasonable combustor length. Based on the numerical data obtained, a constant area-divergent area combustion chamber was designed and fabricated for the performance of experimental tests under conditions closely matching those of the numerical study. (Author).
Author: Yu Gong
Author: Hwanil Huh