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Influences of various vortex structures on the dispersion and deposition of small ash particles

机译：各种涡旋结构对小灰粒分散和沉积的影响

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摘要

Numerical simulations were conducted to study the influences of various vortex structures on the dispersion and deposition processes of 1 μm to 10 μm diameter fly ash particles on the rear side surface of a boiler tube. Turbulent gas flow was simulated with detached eddy simulation (DES) method and vortex structures in the wakes were modeled. Results suggested that the motions of particles in the near wake region were controlled by different vortex structures, and the impact efficiency and deposit concentration on the rear side surface induced by the vortices varied considerably at different velocities. The results of volume percentages distribution of the deposited particles with various diameters simulated were in good agreement with the experimental data.
机译：进行了数值模拟，以研究各种旋涡结构对直径1μm至10μm的粉煤灰在锅炉管后表面的分散和沉积过程的影响。用分离涡模拟（DES）方法模拟了湍流气流，并对尾流中的涡旋结构进行了建模。结果表明，近尾流区粒子的运动受不同的涡旋结构控制，并且在不同的速度下，由涡旋引起的冲击效率和沉积物在后侧表面上的浓度变化很大。模拟的各种直径的沉积颗粒的体积百分比分布结果与实验数据吻合良好。

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