Numerical study of combustion regimes in thermally coupled system with solid phase reaction and premixed gas flame in porous medium
| Autor: | S. S. Minaev, Evgeniy Sereshchenko, R. V. Fursenko |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Mechanical Engineering General Chemical Engineering Mechanics Combustion Energetic material Volumetric flow rate Cylinder (engine) law.invention Physics::Fluid Dynamics Heat flux law Phase (matter) Thermal Physics::Chemical Physics Physical and Theoretical Chemistry Porous medium Physics::Atmospheric and Oceanic Physics |
| Zdroj: | Proceedings of the Combustion Institute. 38:6763-6772 |
| ISSN: | 1540-7489 |
| Popis: | Dynamical behavior of solid phase reaction thermally coupled with filtrational gas combustion wave is studied numerically in the frame of one-dimensional model. Examined combustion system is combustible solid cylinder surrounded by inert porous tube through which the gaseous fuel–air mixture is supplied in axial direction. The effects of solid material chemical properties and the gas inlet velocity on the dynamic behavior of coupled combustion waves were investigated. The existence of multiple combustion regimes was found and the regime diagrams in gaseous mixture flow rate/energetic properties of solid material plane were plotted. Numerical results show that in the case of downstream propagating filtrational combustion wave the burning velocity of solid energetic material is essentially increased that create difficulties in organization of stable combustion in the considered system. In contrast, for upstream propagating flames, the combustion waves in gas and solid phases propagate together in strong thermal coupling. The distance between the combustion waves in this case is small and the burning rate of solid material can be controlled by gaseous mixture flow rate. It is numerically shown that the heat flux from the products of gas phase reactions extends the extinction limits of solid phase flame. It is also found, that oscillations of solid phase reaction wave induced by diffusive-thermal pulsating instability can be suppressed by means of thermal interaction with filtrational gas combustion wave. |
| Databáze: | OpenAIRE |
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