微小颗粒横掠圆管的数值分析

Numerical analysis of tiny particles sweep round tube bundles

中文关键词: 颗粒  气固两相流动  管束  沉积模型

英文关键词: particles  particulate phase flow  tube bundles  deposition model

中文摘要:

      利用拉格朗日粒子随机追踪模型以及El-Batsh 和Haselbacher提出的粒子沉积模型，对飞灰颗粒横掠管束时的运动轨迹和沉积特性进行了数值研究，获得了管束排布方式以及粒子直径对飞灰颗粒运动轨迹及沉积分布的影响。结果表明：当颗粒的直径小到一定程度时，管束通道内的流场和温度分布对颗粒的运动轨迹影响显著；颗粒在管壁表面的碰撞率和沉积率与管束排布和粒径有关，粒径50.0um颗粒几乎没有沉积；粒径10.0um颗粒沉积主要分布在管壁迎风面；粒径1.0um的颗粒在管壁的迎风面和背风面都有沉积。

英文摘要:

      The particulate transport and deposition of the particle-laden flow crossing tube bundles were numerically calculated by using the Lagrangian stochastic tracking model and the particle deposition model presented by El-Batsh and Haselbacher. Results illustrate that the tube arrangements and the particle size have important effects on particle trajectories and deposition. When the particle size is smaller than a certain degree, the particle trajectories are significantly affected by the flow flield and temperature distribution inside tube bundles. The collision rate and the deposition rate of particles on the tube surface are related to the tube bundle arrangement and particle size. Almost no deposition of particle diameter of 50 um；deposition area of particle size of 10 um are mainly distributed in windward side while particle size of 1 um are distributed in all the windward and leeward side.