Intensification of MILD combustion of methane and hydrogen blend by the application of a magnetic field- a numerical study. (July 2021)

• Record Type: Journal Article
• Authors: Zharfa, Mohammadreza; Karimi, Nader
• Is Part Of: Acta astronautica. Volume 184(2021)
• Page Start: 259
• Page End: 268
• Publication Date: 2021-07
• Subjects: Moderate or intense low oxygen dilution -- Magnetic field -- Air preheating temperature -- Flame lift-off; Astronautics -- Periodicals; Outer space -- Exploration -- Periodicals; Astronautics; Periodicals; 629.405
• DOI: 10.1016/j.actaastro.2021.04.023
• Languages: English
• ISSNs: 0094-5765

Abstract

Abstract: The influence of an imposed magnetic field upon the behavior of a reacting flow under hydrogen-methane moderate or intense low oxygen dilution regime is investigated numerically. This is achieved through addition of a series of baffles close to the inlet nozzles of a well-characterized moderate or intense low oxygen dilution burner and applying variable intensity magnetic field therein. The resultant combusting flow under magneto-hydrodynamic effects is modeled using a standard RANS scheme with the inclusion of detailed chemistry (GRI. 2.1.1), eddy dissipation concept model with the volume fraction and time scale constants of 3 and 1, respectively, and the discrete ordinates radiation model. The simulation results show that application of the magnetic field allows significant reductions in the air preheating temperature often required for moderate or intense low oxygen dilution combustion. Examination of the radial distribution of different chemical spices (CH2 O, OH, and CHO) shows that the imposed magnetic field results in thickening of the reacting flow and intensification of heat release. Highlights: The effects of an imposed magnetic field upon the behavior of a reacting flow under MILD is studied. The magnetic field reduces the air preheating temperature often required for MILD combustion. The imposed magnetic flied results in thickening of the reacting flow and intensification of heat release.