Model for filtration combustion of carbon: Approximation of a thermodynamically equilibrium composition of combustion products

2014 ◽  
Vol 50 (3) ◽  
pp. 251-261 ◽  
Author(s):  
E. V. Polianczyk ◽  
S. V. Glazov
1986 ◽  
Vol 51 (6) ◽  
pp. 1206-1212 ◽  
Author(s):  
Oldřich Coufal

A method is proposed for determing components whose concentration in a system of chemically reacting components is zero without necessity of computing the composition of the entire system. Theoretical considerations are applied to the case of the equilibrium composition of combustion products of hydrocarbons with air and an ionization additive, K2CO3.


2020 ◽  
Vol 22 (4) ◽  
pp. 263
Author(s):  
E.A. Salgansky ◽  
D.N. Podlesniy ◽  
M.V. Tsvetkov ◽  
A.Yu. Zaichenko

Thermodynamic calculations for describing the compositions of the products formed in conditions of the filtration combustion of the metal-containing mixtures were carried out. The analysis of the equilibrium compositions of the products was carried out using the TERRA high-temperature thermochemical equilibrium calculation program. According to the results of calculations, the metals were divided into two groups. First one forms both the condensed and gaseous phases and in the second one ‒ metals that are only in the condensed phase. In case of the presence of metal compounds in the gas phase, as a rule, these are the following compounds: metals, oxides, hydroxides, hydrides, sulfides and metal sulfates. Metals of the second group cannot be subjected to mass transfer under conditions of the filtration combustion wave and will remain in solid combustion products (in ash).


Author(s):  
A. Korotkikh ◽  
◽  
I. Sorokin ◽  
◽  

The paper presents the results of thermodynamic calculations of the effect of pure boron additives on combustion characteristics of high-energy materials (HEM) based on ammonium perchlorate, ammonium nitrate, active fuel-binder, and powders of aluminum Al, titanium Ti, magnesium Mg, and boron B. The combustion parameters and the equilibrium composition of condensed combustion products (CCPs) of HEM model compositions were obtained with thermodynamic calculation program “Terra.” The compositions of solid propellants with different ratios of metals (Al/B, Ti/B, Mg/B, and Al/Mg/B) were considered. The combustion temperature Tad in a combustion chamber, the vacuum specific impulse J at the nozzle exit, and the mass fraction ma of the CCPs for HEMs were determined.


2020 ◽  
pp. 44-49
Author(s):  
Алексей Юрьевич Шебеко ◽  
Юрий Николаевич Шебеко

Выполнена расчетная оценка равновесного состава продуктов горения околостехиометрических смесей вида метан - фторированный углеводород - воздух с использованием как программного комплекса Chemical Workbench, так и предложенной в настоящей работе упрощенной методики. Найдено, что основными продуктами горения являются CO, HO, CO, HF. При этом концентрации прочих продуктов горения имеют существенно более низкие значения. С помощью программного комплекса FDS выполнен расчет динамики концентраций опасных продуктов (СО, HF) в атмосфере модельного помещения объемом 12,6 м. Найдено, что для указанного помещения предельно допустимая концентрация CO достигается через 730 с после начала горения, а HF - практически мгновенно. Результаты работы могут быть полезны при применении фторированных углеводородов для пожаротушения и флегматизации горючих газовых смесей. Calculations of equilibrium compositions of combustion products at burning of near stoichiometric mixtures of methane-fluorinated hydrocarbon-air are presented. The program tool Chemical Workbench was used. Also a Simplified method was proposed. It was found that CO, HO, CO and HF are the main combustion products, and the concentration of other products are much more lower. The results of the calculations of the concentrations of the above mentioned products (CO, HO, CO and HF) by means of the simplified method are close to that obtained by the tool Chemical Workbench ones. The concentrations of CO and HF (the main hazardous products) as a function of time were determined for a typical room volume of 12, 6 m using the program tool FDS 6. It was found that a limiting allowable concentration of CO was reached after 730 s from the burning beginning, but at the case of HF this concentration was reached almost instantaneously. The results of this study can be used at an application of the fluorinated hydrocarbons for fire extinguishing and inertization of flammable gaseous mixtures.


2018 ◽  
Vol 247 ◽  
pp. 00021
Author(s):  
Vasyl Lusch ◽  
Vasyl Loik ◽  
Oleksandr Lazarenko ◽  
Mirosław Kosiorek

The conditions created during training of firefighters in the mobile training complex of the Polish company «Egeria group» are considered. Currently, the determination of the parameters of the gas environment created by the combustion of pure propane (C3H8), vaseline oil and nitrogen oxide (N2O) over a period of time remains a problematic issue. At the same time, the conditions, which are created when combustion in such cameras, namely, the approximate temperature, the composition of combustion products, their volume during training in mobile training systems remain unexplored. The determination of the amount of combustion products was carried out by solving the equations for determining the material balance of the process of combustion of propane at the maximum temperature created by the mobile training complex and room temperature. As the calculations performed in the mobile training complex during the burning of propane to obtain a high temperature, the oxygen concentration in the air will remain safe - 20.16%. This will gradually increase the content of СО2, N2 and H2O vapour, since the composition of the products of combustion in the percentage ratio will be: СО2 = 11.63%; H2O = 15.5%; N2 = 72.87%.


The paper describes calculations and some computations of the composition of combustion products of methane and oxygen-enriched air between 1000 and 4000 °K. The effect of introducing potassium into the mixture is considered. This gives rise to the presence of electrons in large quantities and to certain redistributions in the proportions of some compounds and, at different temperatures, to the formation of a variety of potassium compounds. The formation of those compounds has a considerable effect on the concentration of electrons.


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