压缩空气泡沫管路输送的模拟计算

采用Fluent软件,选用Spalart-Allmaras模型模拟不同气液比下压缩空气A类泡沫在管路中的流动,对不同气液比下压缩空气泡沫的黏度和阻力损失进行研究。实验结果表明,采用Rabinowitsch-Mooney方程计算泡沫在较高流速下的剪切速率,再得出不同流量下泡沫的黏度,与模拟所得泡沫黏度吻合较好;数值模拟阻力损失与文献实验值的相对误差在10%以内;利用达西公式得到沿程阻力系数与广义雷诺数的关系,并得到了不同流量下泡沫运输管路出口处的压力。

Flow simulation of compressed air foam pipeline

Using Fluent software,the Spalart-Allmaras model was used to simulate the flow of compressed air A foam in the pipeline under different gas-liquid ratios,and the viscosity and resistance loss of the compressed air foam under different gas-liquid ratios were studied. The results showed that the shear rate of foam at high flow rate was calculated by Rabinowitsch-Mooney equation,and the viscosity of foam at different flow rates are in good agreement with that obtained by simulation. The relative error between the numerical simulation resistance loss and the experimental value in literature was less than 10%. The relation between the resistance coefficient along the path and the generalized Re was obtained by using Darcy formula,and the pressure at the outlet of the foam transportation pipeline at different flow rates was obtained.