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The Research on the Characteristics of Two-Phase Mixture Discharges under Lightning Impulse Voltage

Author: DengHeMing
Tutor: HeZhengHao
School: Huazhong University of Science and Technology
Course: Environmental Engineering
Keywords: Two -phase body discharge Particle size effects Path Selection Breakdown Voltage Permittivity Volume fraction Electric field analysis
CLC: O46
Type: PhD thesis
Year: 2010
Downloads: 130
Quote: 0
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Abstract


The two-phase body discharge means in a large number of liquid droplets or solid particles suspended in the gas, as well as a large number of bubbles or solid particles suspended in a liquid discharge phenomenon. Two-phase body discharge as an important form of discharge, has a unique nature. Existing research in the field only with gas discharge or discharge liquid theory approximate processing two-phase body discharge, while ignoring the impact of two-phase body to discharge, so the conclusion is far from the actual situation. In this paper, two-phase body discharge gas discharge characteristics comparison as the main line, focus on experimental research closely related to the atmospheric pressure and electrical insulation, non-uniform electric field of two-phase discharge characteristics, systematic analysis of the non-gas phase particles of the two-phase body particle size, dielectric constant, and the volume fraction of the two-phase discharge. In order to better clarify the characteristics of two-phase discharge, a two-phase body lightning impulse discharge as the discharge form, selected quartz sand, industrial salt and other substances as a solid phase material, and water as a liquid material to form two body, and in the same kind of two-phase body (in addition to flue gas), composition and particle size distribution of the non-gaseous substances; carry out the impact of the research work of the two-phase lightning impulse discharge, developed a two-phase body lightning surge 50% breakdown voltage (U50) and two-phase body of experimental apparatus lightning impulse discharge path, select the experimental method and the experimental study. Microscope method of particle size of 21 kinds of two-phase body in gas phase using laser scattering method for quantitative analysis of the effects of non-gas particles lightning impulse discharge using particle image velocimetry, digital cameras and other indirect measurement two-phase body non-gas phase volume fraction. From the experimental point of studied parameters (particle diameter, volume fraction and permittivity) of the non-gas phase of two-phase body lightning impulse discharge of the two-phase body, and found that the breakdown voltage of the two-phase body and the path to select the presence of particles the influence of the particle size is much larger than the particle size effect of the impact of the particulate material \100μm, a discharge path to select the two-phase body is greater than 50% probability, the breakdown voltage lower than the breakdown voltage of air; particle size ranging between 10μm and 100μm, the discharge path showed significant polarity difference, a negative resistance, the discharge path to select the two-phase body is greater than 50% probability, the breakdown voltage is lower than the breakdown voltage of air, but the positive polarity, the discharge path select the probability of the air is higher than the selection probability of two-phase body, the breakdown voltage higher than the breakdown voltage of air; inverted changes also occur even if the dielectric constant and the volume fraction is fixed. The breakdown voltage and a discharge path in the body of the two-phase select the probability of two-phase body, but in the same particle size range, select the probability of non-occurrence of a reversal of change with the changes in the dielectric constant and the volume fraction. Lightning impulse discharge characteristics of the two phase body mechanism analysis, the first analysis of the influence of the electric field of the non-gaseous material particles, and then, from the three areas of the dielectric constant of the non-gaseous material particles, the volume fraction and particle size analysis of non-gaseous substances particles on the discharge of the two-phase body, analysis of the particle size of the non-gaseous material particles affect the dielectric constant is much larger than the particulate matter, the volume fraction of the \The particle size of the non-gaseous substances affect triggered streamer front end the avalanche seed electronics, electronic avalanche and streamer channel charge, the distortion of the electric field peak and range of factors, these factors combine to cause the discharge phenomenon different particle size under various changes inverted changes also occur, even if the dielectric constant and the volume fraction is fixed. Thus, two phases exist in the body discharge the influence of the particle size is much larger than the dielectric constant of the particles, the volume fraction of impact.

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