DTIC ADA215032: Basic Instability Mechanisms in Chemically pdf

DTIC ADA215032: Basic Instability Mechanisms in Chemically

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Stability of one-dimensional piston-supported detonation was examined both numerically and analytically. Numerical calculations were conducted for a one-step, first-order, irreversible reaction obeying an Arrhenius rate expression. An approximate linearized stability theory was also developed for the case of high activation-energy reactions and the mechanism of instability identified. Analysis demonstrates that interaction between the irreversible temperature fluctuations and the reaction zone induces an oscillatory energy- source field, which then leads to shock perturbations and thereby the temperature fluctuation. Frequencies of all the unstable and stable modes of this system can be predicted. They agree remarkably well with the findings of the numerical calculations and the observations in blunt-body flow experiments. The problem of direct initiation of gaseous detonations was examined theoretically, to determine the correlation between the critical energy and power for successful initiation, and to predict their respective threshold values. Results were found to agree well with the experimental observations of cylindrical detonations in oxy-acetylene mixtures.

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• Creator/s: Defense Technical Information Center
• Date: 9/1/1980
• Year: 1980
• Book Topics/Themes: DTIC Archive, Toong, T Y, MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING, *SUPERSONIC FLOW, *SUBSONIC FLOW, *DETONATION WAVES, *REACTION KINETICS, THEORY, ENERGY, NUMERICAL ANALYSIS, RATES, EXPLOSIVES, GASES, MIXTURES, VARIATIONS, HIGH ENERGY, OXYGEN, CYLINDRICAL BODIES, RESPONSE, APPROXIMATION(MATHEMATICS), LINEARITY, ACETYLENE, FLOW, BLUNT BODIES, DETONATIONS, IRREVERSIBLE PROCESSES, SOLID PHASES, ACTIVATION ENERGY, ARRHENIUS EQUATION, THRESHOLD EFFECTS, COMPUTATIONS, LIQUID EXPLOSIVES, TEMPERATURE, STABILITY

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