Reduction of PM Emission from High-Voltage Applied Diffusion Flame

概要

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Effect of non-uniformed electric field on PM emission from an acetylene diffusion flame was investigated experimentally. When a high voltage was applied to the flame, ionic wind blew from nozzle electrode toward ground electrode. The ionic wind increased with increasing the applied voltage. The velocity of ionic wind around the flame was measured by means of LDA (Laser Doppler Anemometer). Particle size distributions of PM emitted from two different types of flame were measured with SMPS (Scanning Mobility Particle Analyzer). As the applied voltage was increased, the flame length became short and fluctuation of the flame tip increased. In the case of "Open flame", the PM emission more than 90% was suppressed by applying the electric field intensity of 150 kV/m. Especially, the emission of relatively large particles (30500nm) decreased by the promotion of the mixing of fuel and surrounding air, while the emission of PM smaller than 20nm increased with increasing the applied voltage.