水平管道内横向流气泡生长变化模拟研究
Simulation of Bubble Growth in Transverse Flow in Horizontal Pipe
摘要: 采用数值模拟方法对恒定水速下管道中气体喷射产生的气泡进行分析,追踪气泡生成和脱离的演变情况,重点研究了横向水流速度和通气速度对气泡生成的影响。计算采用二阶迎风差分格式的有限体积法求解二维Navier-Stocks方程,并运用VOF (流体体积法)方法捕捉气液界面。计算结果表明:水流速度主导气泡的生成形态,一定程度上也受通气速度影响;生成气泡的等效直径随通气速度的增加而呈线性增长,水流速度越小,生成气泡随通气速度的增加越快;通气速度一定,随着水流速度的增加,气泡脱离位置的横坐标初期缓慢增长,当水流速度到达0.5 m/s后呈线性增长。伴随着气泡形态的变化,气泡参数随水流速度和通气速度改变时,呈现出多样性和多变性。
Abstract: Numerical simulation methods are used to analyze the bubbles generated by gas jets in pipelines under constant water velocity, to track the evolution of bubble generation and separation, and to focus on the influence of lateral water velocity and ventilation velocity on bubble generation. A fi-nite volume method with second-order upwind difference scheme is used to solve the two-dimen- sional Navier-Stocks equation. The VOF (Volume of Fluid Method) method is used to capture the gas-liquid interface. The calculation results show that the water velocity dominates the bubble generation form which also affected by the ventilation speed to a certain extent; the size of the generated bubbles increases linearly with the increase of the ventilation speed, the smaller the water velocity, the faster the generated bubbles increase with the ventilation speed. When the ventilation speed is constant, with the increase of the water velocity, the length of the air column when the bubble is separated increases slowly at the initial stage, and linearly increases when the water velocity reaches 0.5 m/s. Along with the change of bubble shape, bubble parameters show diversity and variability when changing with water velocity and ventilation speed.
文章引用:钱凯凯, 王治云. 水平管道内横向流气泡生长变化模拟研究[J]. 建模与仿真, 2021, 10(2): 424-434. https://doi.org/10.12677/MOS.2021.102043

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