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The Numerical Study on Detonation and Its Suppression in Flammable System

Author: LiXiaoQin
Tutor: XieBo
School: Chongqing University
Course: Safety Technology and Engineering
Keywords: Detonation Explosion suppression Two-phase reactive flow Elementary reactions Numerical Simulation
CLC: O381
Type: Master's thesis
Year: 2010
Downloads: 24
Quote: 0
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Abstract


In this paper, the two-fluid model for the basic model , consider the primitive chemical reactions , momentum, and energy transport effects of shock problems , as well as between the gas and particle phase , the establishment of a one-dimensional combustible system detonation as well as inert particles explosion suppression theoretical model . The same time , based on the one-dimensional problem derived Riemann invariant expression , Lee TVD scheme and the MacCormack scheme for solving the equations of gas and particle phase , processing time splitting scheme Fangcheng Gang problems Ronge-Kutta method for solving chemical reaction , to establish numerical the simulation numerical methods . Process of the combustible system induced by the high temperature fireball H 2 -O 2 - N 2 < / sub > mixture detonation propagation and its inert particles explosion suppression a numerical study . The results show that : the initial conditions within a certain range , the high - temperature fire group ignition induced shock and then developed for the detonation process is the establishment of a suitable concentration of inert dusts ; loaded in a certain explosion suppression band area , due to gas , granulocyte momentum between the two-phase , energy transfer , the combustion flame can be deceleration , gradually increasing the distance between the shock wave and the flame loses its energy to support , while the dust particles may also absorb shock energy , two effects at the same time , mutual feedback shock rapidly decay, explosion suppression success ; when a certain concentration with inert dust particles , the particle diameter of the explosion suppression agent , the smaller the particle density of the material , the better the effect of the explosion suppression ; when the particle diameter and density of the material the same time, the larger the explosion suppression agent concentration , the better the effect of the explosion suppression . The above conclusions are consistent with the classical theory and experimental results . The simulation results reflect a burning fireball in the formation of flame acceleration and shock , and thus the growth process of the detonation wave , as well as inert dust particles inhibit the process of detonation wave in a combustible environment suitable initial conditions . Figured out the the explosion suppression structural features of the flow field , and the variation of the characteristic parameters , basically reveals the inert dust particles explosion suppression mechanism provides important technical ideas and ways to promote the effectiveness and reliability of the explosion suppression system development .

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CLC: > Mathematical sciences and chemical > Mechanics > Explosion > Knock ( detonation ) theory
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