Abstract Hybrid structure significantly affects the collection mechanism and performance of a hybrid particulate collector. The electrostatic precipitation of particles in the wire-perforated plate structure of a full-scale compact hybrid particulate collector is numerically simulated in this study. The distributions of electric and flow fields and the charging, motion, and precipitation of particles in this specific structure are studied. The results show that the distribution of electric field in the final stage is asymmetrical because of the baffle plate at the end of the channel. The field distributions of other stages are identical to that of wire-plate electrostatic precipitator. The openings increase the electric field strength in the region adjacent to the perforated plate. The electric field passes through the openings, which is then distributed to the back side of the perforated plate. The aerosol cross flow rate along the perforated plate varies periodically under the effect of electric body force. Whereas, the overall cross flow rate of each stage is the same, except the first stage. Two counter-rotating eddies are formed behind the perforated plate between every two openings. Particle charge exceeds 80% of the final charge when the particles move to the position of the first wire. The 10 μm particles finish their charging processes faster than 1 μm particles with a final charge of approximately 100 times that of 1 μm particles. The charge acquired by a particle under the wire-perforated plate structure is 3% higher than that under the wire-plate structure. Particle trajectory result shows three modes of electrostatic precipitation in a compact hybrid particulate collector, namely, collection on the front, flank, and back sides of the perforated plate. Particle transport by eddies on the back of the perforated plate plays an important role in particle deposition on the back side. Variation in the capture probability of particles released from different positions corresponds to the opening structure. High and low probability areas separate with each other. The collection efficiency of 10 μm particle is higher than that of the 1 μm particle. The results can explain hybrid mechanism and optimize hybrid structure.

中文翻译：

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紧凑型混合颗粒收集器中静电沉淀的机理研究

摘要 混合结构显着影响混合颗粒收集器的收集机制和性能。本研究对全尺寸紧凑型混合颗粒收集器的金属丝穿孔板结构中颗粒的静电沉淀进行了数值模拟。研究了该特定结构中电场和流场的分布以及粒子的充电、运动和沉淀。结果表明，由于通道末端有挡板，末级电场分布不对称。其他级场分布与线板静电除尘器相同。开口增加了与穿孔板相邻的区域中的电场强度。电场通过开口，然后将其分配到穿孔板的背面。在电体力的作用下，气溶胶沿多孔板的交叉流速呈周期性变化。而除第一级外，每一级的总错流率是相同的。在每两个开口之间的穿孔板后面形成两个反向旋转的涡流。当粒子移动到第一根导线的位置时，粒子电荷超过最终电荷的 80%。10 μm 粒子完成充电过程的速度比 1 μm 粒子快，最终电荷约为 1 μm 粒子的 100 倍。线孔板结构下的粒子获得的电荷比线板结构下的高3%。颗粒轨迹结果显示了紧凑型混合颗粒收集器中三种静电沉淀模式，即在穿孔板的正面、侧面和背面收集。穿孔板背面涡流的颗粒传输在背面的颗粒沉积中起着重要作用。从不同位置释放的粒子捕获概率的变化对应于开口结构。高概率区域和低概率区域彼此分开。10 μm 颗粒的收集效率高于 1 μm 颗粒的收集效率。结果可以解释混合机理并优化混合结构。穿孔板背面涡流的颗粒传输在背面的颗粒沉积中起着重要作用。从不同位置释放的粒子捕获概率的变化对应于开口结构。高概率区域和低概率区域彼此分开。10 μm 颗粒的收集效率高于 1 μm 颗粒的收集效率。结果可以解释混合机理并优化混合结构。穿孔板背面涡流的颗粒传输在背面的颗粒沉积中起着重要作用。从不同位置释放的粒子捕获概率的变化对应于开口结构。高概率区域和低概率区域彼此分开。10 μm 颗粒的收集效率高于 1 μm 颗粒的收集效率。结果可以解释混合机理并优化混合结构。