Visual observation and numerical analysis on the reaction zone structure of a supersonic-flow CO chemical laser

1991 ◽  
Author(s):  
Wataru Masuda
Keyword(s):  
Numerical Analysis ◽  
Supersonic Flow ◽  
Reaction Zone ◽  
Visual Observation ◽  
Zone Structure ◽  
Chemical Laser

Numerical analysis of the output performance of a pulsed HBr chemical laser

1979 ◽  
Vol 50 (9) ◽  
pp. 5615-5623 ◽  
Author(s):  
M. Iyoda ◽  
M. Udagawa ◽  
M. Obara ◽  
T. Fujioka
Keyword(s):  
Numerical Analysis ◽  
Chemical Laser ◽  
Output Performance

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.

Numerical analysis of operating conditions of a continuous-action HF chemical laser

1979 ◽  
Vol 15 (1) ◽  
pp. 75-81 ◽  
Author(s):  
A. V. Lavrov ◽  
V. A. Pospelov ◽  
A. V. Fedotov ◽  
M. L. Shur
Keyword(s):  
Numerical Analysis ◽  
Operating Conditions ◽  
Continuous Action ◽  
Chemical Laser
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