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Large-Eddy Simulation of Two-Phase Flow in Air-Sparged Hydrocyclone

机译：空气喷射水力旋流器中两相流量的大涡流模拟

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摘要

Two-phase flow of air and water in a 2-inch Air-Sparged Hydrocyclone (ASH) is computed using Large-Eddy Simulation of two-fluid (Euler-Euler) model. The computational mesh is a block-structured O-type grid that has 10.5 Million hexagonal elements. A uniform air bubble diameter of 0.5 mm has been specified. The LES model has been validated by comparison with experimental data for a conventional classifying hydrocyclone [1]. The flow field in ASH has been investigated for inlet flow rate of water of 30.6 L/min at different values of underflow exit pressure. The present LES simulations show that the distribution of air volume fraction, water axial velocity, tangential velocity and swirling layer thickness depend on the value of static pressure imposed at the underflow section. The loci of zero-axial velocity surfaces have been determined from the profiles of axial velocity. The water split ratio through the overflow opening vary with underflow exit pressure as 6%, 8%, 16% and 26% for 3, 4, 5, and 6 kPa, respectively. These results indicate that regulating the pressure at the underflow exit can be used to optimize the performance of ASH.
机译：使用两种流体（欧拉欧拉）模型的大涡流模拟来计算2英寸空气流水力旋流器（Ash）中的两相空气和水。计算网格是一个结构块结构的O型网格，具有1050万个六边形元素。已经指定了0.5mm的均匀气泡直径。通过与常规分类氢胞酮的实验数据进行比较，已经验证了LES模型[1]。已经研究了Ash中的流场，用于在下溢退出压力的不同值下的30.6升/分钟的入口流速。目前的LES模拟表明，空气量分数，水轴流速度，切向速度和旋流层厚度的分布取决于施加在下溢部分处的静压的值。零轴速度表面的基因座已从轴向速度的轮廓确定。通过溢流开口的水分流比分别随着下溢压力为6％，8％，16％和26％，分别为3,4,5和6kPa。这些结果表明，调节下溢出口处的压力可用于优化灰分的性能。

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