|
This article is cited in 10 scientific papers (total in 10 papers)
Mechanism of upper temperature limits in a wave of filtration combustion of gases
S. I. Futko Belarusia National Academy of Sciences, Institute of Heat and Mass Transfer, Minsk, 220072
Abstract:
A physical mechanism is established, responsible for the experimentally observed strong deceleration of the growth rate of the maximum skeleton temperature in a wave of filtration combustion of gases with increasing flow rate. The maximum temperatures of the gas and skeleton become commensurable, and the length of the thermal-relaxation zone becomes much shorter. A classification of regimes based on the temperature-heterogeneity criterion $\varphi_1$ is proposed. Explicit analytical solutions are obtained for the wave for $\varphi_1\ll1$ and $\varphi_1\to1$. A correction to reverse reactions in combustion products is considered. The effect of composition on wave behavior is studied by means of numerical calculations with a detailed kinetic scheme. The activation energy for ultrarich and ultralean methane–air mixtures is evaluated. It is concluded that the limiting efficiency of the heat-recuperation cycle in the wave is reached as $\varphi_1\to1$ methods for maximizing the efficiency are suggested.
Keywords:
filtration combustion, limiting efficiency, heat-recuperation cycle, superadiabatic effect, effect of the composition, detailed simulation, ultrarich mixtures.
Received: 14.07.2000 Accepted: 17.07.2002
Citation:
S. I. Futko, “Mechanism of upper temperature limits in a wave of filtration combustion of gases”, Fizika Goreniya i Vzryva, 39:2 (2003), 15–25; Combustion, Explosion and Shock Waves, 39:2 (2003), 130–139
Linking options:
https://www.mathnet.ru/eng/fgv1856 https://www.mathnet.ru/eng/fgv/v39/i2/p15
|
Statistics & downloads: |
Abstract page: | 20 |
|