主动旋流管道除垢系统的三维数值模拟

Active Vortex Pipeline Descaling System of the Three-Dimensional Numerical Simulation

为分析主动旋流管道除垢系统的清洗效果,建立了以高压高速空气为介质的内置螺旋凹槽管的环形流动模型,利用fluent软件对光滑管和内置螺旋凹槽管进行数值模拟,并利用网格无关性验证模型网格。模拟结果表明:内置螺旋凹槽管的环形流动呈复杂的三维螺旋流动,而光滑管则呈普通的直线流动。在相同的条件下,内置螺旋凹槽管的切向速度比较剧烈,而光滑管的切向速度几乎为零,内置螺旋凹槽管的径向速度也比光滑管的大。内置螺旋凹槽管的切向和轴向速度的增大,使边界层减弱,有利于增大管壁的冲刷力,从而增强清洗管道的效果。

For the analysis of the cleaning effect of an active vortex pipeline descaling system, this paper has set up a buih- in circular flow model with high-pressure and high-speed air as a medium of the spiral groove tube, and used fluent software to carry on the numerical simulations of smooth the tube and the built-in spiral groove tube with the help of the grid independence test model gird. The simulation results show that the annular flow inside the built-in spiral groove tube is a complex 3D spiral flow, and inside the smooth tube is an ordinary linear flow. Under the same condition, the tangential velocity of the inner spiral groove tube is severe, that inside the smooth tube being almost zero. In addition, the radial velocity in the built-in spiral groove tube is large than in the smooth tube. The tangential and axial velocties of the built-in spiral groove tube increase and the bounda- ry layer is abate, therefore beneficial to increasing tube wall erosion force, achiveing a better effect of cleaning pipelines.