Numerical simulation of multifront detonationon a hybrid computational cluster using detailed chemical mechanisms

2020 ◽  
Author(s):  
S. P. Borisov ◽  
A. N. Kudryavtsev ◽  
A. A. Shershnev
Keyword(s):  
Numerical Simulation ◽  
Chemical Mechanisms ◽  
Computational Cluster ◽  
Detailed Chemical

Mechanism of Wall Turbulence Modulation With Premixed Hydrogen Combustion

2019 ◽  
Author(s):  
Takashi Ohta ◽  
Yuta Onishi ◽  
Yasuyuki Sakai
Keyword(s):  
Numerical Simulation ◽  
Thermal Expansion ◽  
Reaction Mechanism ◽  
Wall Turbulence ◽  
Streamwise Vortices ◽  
Turbulence Modulation ◽  
Turbulence Structures ◽  
Chemical Reaction Mechanism ◽  
Vorticity Transport ◽  
Detailed Chemical

Abstract In order to clarify the mechanism of modulation of turbulence structures such as quasi-streamwise vortices affected by a flame propagating toward a wall, we perform a direct numerical simulation of wall turbulence with premixed hydrogen-air combustion using a detailed chemical reaction mechanism. As a result, existing quasi-streamwise vortices in turbulence near the wall are found to be suppressed, disappearing as the flame approaches. Hence, the turbulent flow tends to become laminar. Moreover, according to the analysis of the vorticity transport equation, it is found that the suppression is due to thermal expansion of the flame rather than an increase in viscosity. From the viewpoint of chemical reactions, it is revealed that thermal expansion inside turbulence vortices is mainly caused by reactions involving H2 and H2O2.

Combustion Synthesis of Nanoscale Oxide Powders: Mechanism, Characterization and Properties

2003 ◽  
Vol 800 ◽  
Author(s):  
Arvind Varma ◽  
Alexander S. Mukasyan ◽  
Kishori T. Deshpande ◽  
Pavol Pranda ◽  
Peter R. Erri
Keyword(s):  
High Surface ◽  
High Surface Area ◽  
Thermal Conditions ◽  
Optimum Conditions ◽  
Combustion Mode ◽  
Chemical Mechanisms ◽  
Oxide Powders ◽  
Extensive Experimental Data ◽  
First Time ◽  
Detailed Chemical

ABSTRACTBased on the analysis of extensive experimental data, we have formulated basic criteria necessary for the synthesis of a variety of oxides in the combustion mode, and defined optimum conditions for the production of high-surface area, well-crystalline nano-powders of desired phase composition and purity. Also, for the first time, detailed chemical mechanisms of interaction for various systems are identified, outlining specific roles of different fuels, oxidizers and thermal conditions

Simulation of H2-Air Turbulent Diffusion Flame by the Combustion Model Using Chemical Equilibrium Combined With the Eddy Dissipation Concept

2009 ◽  
Author(s):  
Kazui Fukumoto ◽  
Yoshifumi Ogami
Keyword(s):  
Chemical Equilibrium ◽  
Diffusion Flame ◽  
Turbulent Diffusion ◽  
Combustion Products ◽  
Combustion Model ◽  
Intermediate Species ◽  
Turbulent Diffusion Flame ◽  
Chemical Mechanisms ◽  
Equilibrium Method ◽  
Detailed Chemical

This research aims at developing a turbulent diffusion combustion model based on the chemical equilibrium method and chemical kinetics for simplifying complex chemical mechanisms. This paper presents a combustion model based on the chemical equilibrium method and the eddy dissipation concept (CE-EDC model); the CE-EDC model is validated by simulating a H2-air turbulent diffusion flame. In this model, the reaction rate of fuels and intermediate species is estimated by using the equations of the EDC model. Further, the reacted fuels and intermediate species are assumed to be in chemical equilibrium; the amount of the other species is determined from the amount of the reacted fuels, intermediate species, and air as reactants by using the Gibbs free energy minimization method. An advantage of the CE-EDC model is that the amount of the combustion products can be determined without using detailed chemical mechanisms. The results obtained by using this model were in good agreement with the experimental and computational data obtained by using the EDC model. Using this model, the amount of combustion products can be calculated without using detailed chemical mechanisms. Further, the accuracy of this model is same as that of the EDC model.

Incorporation of Detailed Chemical Mechanisms in Reactive Flow Simulations Using Element-Flux Analysis

2010 ◽  
Vol 49 (21) ◽  
pp. 10471-10478 ◽  
Author(s):  
Kaiyuan He ◽  
Ioannis P. Androulakis ◽  
Marianthi G. Ierapetritou
Keyword(s):  
Reactive Flow ◽  
Flux Analysis ◽  
Chemical Mechanisms ◽  
Flow Simulations ◽  
Element Flux ◽  
Detailed Chemical

Numerical Simulation for Ignitability of Spark Plug using Detailed Chemical Kinetics

2014 ◽  
Author(s):  
Takafumi Shichida ◽  
Hirotoshi Yoshizaki ◽  
Shunsuke Tsuga ◽  
Noriyasu Sugimoto ◽  
Hiroyuki Kameda
Keyword(s):  
Numerical Simulation ◽  
Chemical Kinetics ◽  
Detailed Chemical Kinetics ◽  
Spark Plug ◽  
Detailed Chemical
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