磁界による拡散火炎の安定化に関する実験的研究 : 流れ方向振動火災の磁界による安定化(流体工学,流体機械)

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Stabilizing effect to a oscillating diffusion flame has been revealed in the uniform magnetic field with a circular nozzle at low flow rate of propane gas. An experiment of the pressure effect induced by magnetic field was made by a rectangular nozzle. Measurements of temperature and luminosity were made by a fine thermocouple of Pt-Pt 13%Rh (50 μm) and by a photomultiplier. Discussion of the pressure effect was made at the nozzle port of the rectangular nozzle. The magnetic pressure is expressed by p=(_<кair> - _<кflame>)H^2/2 at the point of the examine. In the uniform magnetic field, the oscillating flame receives a uniform force toward the center of the flame from the surrounding air. The flame cross section changed into smaller one. When the magnetic field was applied to a oscillating flame, the flame changed to a stable flame, and the visible flame length became short, and the temperature of the burned gas kept higher values. From the fact that the flame cross section became small by the magnetic pressure, that is, the temperature gradient in burned gas region in diffusion layer became large. This can be explained in terms of decreasing of the flame length in the uniform magnetic field. According to schlieren photographs, for the oscillating flame, the combustion gas in outer region of the flame shows unstationary (swelled and thin). On the other hand, when the magnetic field was applied to the oscillating flame, the swelled burned gas in outer region changed into that with thin and constant width. Apparent diffusion coefficients calculated with the equation of Hottel and Hawthorne increased when the magnetic field was applied. This result indicates that it is practicable to control the diffusion flame by the magnetic field.
一般社団法人日本機械学会の論文
2003-08-25

磁界による拡散火炎の安定化に関する実験的研究 : 流れ方向振動火災の磁界による安定化(流体工学,流体機械)

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