水平流动边界层内气固相间作用的试验研究

EXPERIMENTAL INVESTIGATION ON INTERACTIONS BETWEEN PHASES IN GAS-SOLID HORIZONTAL BOUNDARY LAYER

摘要

摘要:应用三维粒子动态分析仪（threedimensionalparticledynamicsanalyzer），测量了含有230μm颗粒的气固两相水平流的特性，特别是壁面边界层内的两相流动特性．结果表明颗粒载荷比（质量流率）对相间作用有较大影响，随颗粒流率的增加颗粒对气流平均速度和湍流的影响增大，颗粒使气流速度边界展变薄．颗粒和气流相互作用在不同方向上呈各向异性，颗粒对气流垂直方向的脉动影响较大．颗粒与湍流边界层气流的作用行为大致可以分成三个区域：贴壁区、中间区和外流区．

Abstract:In this paper the interactions between air flow and particles have been investigated with a three dimensional particle dynamics analyzer (PDA) for the gas-solid two-phase flow in a horizontal boundary layer. The mean velocity and the statistics of turbulence fluctuations for both phases in the steamwise and the vertical direction were obtained simultaneously. Effects of particles with nominal diameter of 230μm at two different particle mass loading ratio, 1.8%and 24%, on the air flow boundary layer were exa...