A Convective-Diffusive Reaction Zone Structure Model for Turbulent Detonations

2006 ◽  
Author(s):  
Matei Radulescu ◽  
Akiko Matsuo ◽  
Chung Law
Keyword(s):  
Reaction Zone ◽  
Structure Model ◽  
Zone Structure

scholarly journals The role of unsteadiness in direct initiation of gaseous detonations

2000 ◽  
Vol 421 ◽  
pp. 147-183 ◽  
Author(s):  
CHRIS A. ECKETT ◽  
JAMES J. QUIRK ◽  
JOSEPH E. SHEPHERD
Keyword(s):  
Numerical Simulations ◽  
Decay Rate ◽  
Wave Front ◽  
Reaction Zone ◽  
Critical Energy ◽  
Local Analysis ◽  
Zone Structure ◽  
Gaseous Detonations ◽  
Release Wave ◽  
Direct Initiation

An analytical model is presented for the direct initiation of gaseous detonations by a blast wave. For stable or weakly unstable mixtures, numerical simulations of the spherical direct initiation event and local analysis of the one-dimensional unsteady reaction zone structure identify a competition between heat release, wave front curvature and unsteadiness. The primary failure mechanism is found to be unsteadiness in the induction zone arising from the deceleration of the wave front. The quasi-steady assumption is thus shown to be incorrect for direct initiation. The numerical simulations also suggest a non-uniqueness of critical energy in some cases, and the model developed here is an attempt to explain the lower critical energy only. A critical shock decay rate is determined in terms of the other fundamental dynamic parameters of the detonation wave, and hence this model is referred to as the critical decay rate (CDR) model. The local analysis is validated by integration of reaction-zone structure equations with real gas kinetics and prescribed unsteadiness. The CDR model is then applied to the global initiation problem to produce an analytical equation for the critical energy. Unlike previous phenomenological models of the critical energy, this equation is not dependent on other experimentally determined parameters and for evaluation requires only an appropriate reaction mechanism for the given gas mixture. For different fuel–oxidizer mixtures, it is found to give agreement with experimental data to within an order of magnitude.

Reaction zone structure in turbulent nonpremixed jet flames—from CH-OH PLIF images

2000 ◽  
Vol 122 (1-2) ◽  
pp. 1-19 ◽  
Author(s):  
Jeffrey M. Donbar ◽  
James F. Driscoll ◽  
Campbell D. Carter
Keyword(s):  
Reaction Zone ◽  
Jet Flames ◽  
Zone Structure ◽  
Turbulent Nonpremixed

LOCAL REACTION ZONE STRUCTURE OF NON-PREMIXED FLAMES OF PROPANE WITH HIGHLY PREHEATED LOW-OXYGEN AIR

2007 ◽  
Vol 179 (4) ◽  
pp. 723-745 ◽  
Author(s):  
JUNICHI FURUKAWA ◽  
HIDEKI HASHIMOTO ◽  
SUSUMU MOCHIDA ◽  
TOSHIAKI HASEGAWA
Keyword(s):  
Reaction Zone ◽  
Local Reaction ◽  
Premixed Flames ◽  
Low Oxygen ◽  
Zone Structure

Research on reaction zone structure of high-press gravity-independent singlet oxygen generator

2015 ◽  
Author(s):  
Yushi Liu ◽  
Wenwu Chen ◽  
Jinglong Wang ◽  
Xiaobo Xu ◽  
Zhendong Liu ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Reaction Zone ◽  
Zone Structure ◽  
Oxygen Generator ◽  
Singlet Oxygen Generator

scholarly journals Direct Observations of Reaction Zone Structure in Propagating Detonations

2003 ◽  
Author(s):  
F. Pintgen ◽  
C. A. Eckett ◽  
J. M. Austin ◽  
J. E. Shepherd
Keyword(s):  
Reaction Zone ◽  
Zone Structure ◽  
Direct Observations

Dynamic zone structure model for the surface scattering of large van der Waals clusters at thermal kinetic energies

1995 ◽  
Vol 103 (5) ◽  
pp. 1972-1980 ◽  
Author(s):  
H. Vach ◽  
M. Benslimane ◽  
M. Châtelet ◽  
A. De Martino ◽  
F. Pradère
Keyword(s):  
Van Der Waals ◽  
Surface Scattering ◽  
Structure Model ◽  
Zone Structure ◽  
Van Der Waals Clusters
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