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采用数值模拟方法对含尘气体通过下降管穿越液池过程中的气泡特性进行了研究,展现了该过程中池内气泡生成、破碎和液滴飞溅等一系列行为过程,分析了下降管出口气流速度、静态液位和突扩比等实际操作参数对气泡分布和气液界面面积等气泡特性的影响.结果表明:轴向含气率分布随气流速度的变化存在一个转折点;液面以上空间的含气率随着突扩比的减小而降低,而在液面以下区域,含气率随着突扩比的增大而降低;随着气流速度的增大、静态液位的升高及突扩比的减小,气液界面面积增大.
A numerical simulation was carried out to study the characteristics of bubbles during the passage of dust-laden gas through the downcomer through the liquid pool. A series of behavioral processes such as bubble formation, crushing and droplet splashing in the pool were demonstrated. , Static liquid level and sudden expansion ratio and other actual operating parameters on the bubble distribution and gas-liquid interface area.The results show that there is a turning point in axial gas content distribution with the change of gas velocity; gas above the liquid level The rate decreases with the decrease of the ratio of sudden expansion, while the gas content decreases with the increase of sudden expansion ratio in the region below the liquid surface. With the increase of air velocity, the increase of static level and sudden expansion Than the decrease, the gas-liquid interface area increases.