Magnetic Field Control of Combustion Dynamics

Abstract

Experimental studies and mathematical modelling of the effects of magnetic field on combustion dynamics at thermo-chemical conversion of biomass are carried out with the aim of providing control of the processes developing in the reaction zone of swirling flame. The joint research of the magnetic field effect on the combustion dynamics includes the estimation of this effect on the formation of the swirling flame dynamics, flame temperature and composition, providing analysis of the magnetic field effects on the flame characteristics. The results of experiments have shown that the magnetic field exerts the influence on the flow velocity components by enhancing a swirl motion in the flame reaction zone with swirl-enhanced mixing of the axial flow of volatiles with cold air swirl, by cooling the flame reaction zone and by limiting the thermo-chemical conversion of volatiles. Mathematical modelling of magnetic field effect on the formation of the flame dynamics confirms that the electromagnetic force, which is induced by the electric current surrounding the flame, leads to field-enhanced increase of flow vorticity by enhancing mixing of the reactants. The magnetic field effect on the flame temperature and rate of reactions leads to conclusion that field-enhanced increase of the flow vorticity results in flame cooling by limiting the chemical conversion of the reactants.

On Numerical Simulation of Electromagnetic Field Effects in the Combustion Process

“…The investigation continues the study of Kalis et al [4], [7], [17], [18], where the pressure is eliminate from the Navier-Stokes equations for viscous, incompressible and ideal, compressible flow by introducing the stream function and vorticity for the combustion process with simple exothermic chemical reaction. The swirling flow with axial and azimuthal components of velocity is developed in the pipe.…”

“…In [7] the magnetic field is induced by direct electric current in a coil, which is placed at inlet of the combustor, close to the inner surface of the combustor. The distribution of stream function, azimuthal component of velocity, vorticity and formation of temperature profiles are calculated by varying the electrodynamic force and swirl number.…”

A Study on the Effect of Magnetic Field on the Properties and Combustion of Hydrocarbon Fuels

“…Their tests using UV-visible and FT-IR techniques suggested that Frank-Condon factor (FC), which is a measure of vibrational states of molecules, is affected by magnetisation. On exposure to strong magnetic fields, the temperature and combustion efficiency profiles by a magnetic field were experimentally studied by Barmina and Zake [25]. Their results show that the enhanced mass transfer due to magnetism significantly disturbs the axial and tangential velocity and composition profiles.…”