1.Beijing Key Laboratory of Emission Surveillance and Control for Thermal Power Generation, North China Electric Power University, Beijing 102206, China
2.Shanxi Pingshuo Gangue-fired Power Generation Company Limited, Shuozhou 036800, Shanxi, China
收稿:2019-05-28,
修回:2019-08-08,
纸质出版:2019-11-05
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张仪, 白玉龙, 骆丁玲, 路建洲, 关彦军, 张锴. 液固散式流态化CFD模拟中曳力模型的影响[J]. 化工学报, 2019, 70(11): 4207-4215
ZHANG Yi, BAI Yulong, LUO Dingling, LU Jianzhou, GUAN Yanjun, ZHANG Kai. Effect of drag models on CFD simulations for homogeneous liquid-solid fluidization[J]. CIESC Journal, 2019, 70(11): 4207-4215
张仪, 白玉龙, 骆丁玲, 路建洲, 关彦军, 张锴. 液固散式流态化CFD模拟中曳力模型的影响[J]. 化工学报, 2019, 70(11): 4207-4215 DOI: 10.11949/0438-1157.20190583.
ZHANG Yi, BAI Yulong, LUO Dingling, LU Jianzhou, GUAN Yanjun, ZHANG Kai. Effect of drag models on CFD simulations for homogeneous liquid-solid fluidization[J]. CIESC Journal, 2019, 70(11): 4207-4215 DOI: 10.11949/0438-1157.20190583.
基于无黏性双流体简化模型在商业化软件平台上,通过增加用户自定义子程序考察了Gidaspow、Syamlal-O’Brien、Di Felice、Gibilaro、Dallavalle和BVK曳力模型对液固散式流态化CFD模拟结果的影响行为,探讨了相应的影响机制。经与文献中不同颗粒Reynolds数的代表性实验数据对比后发现:BVK和Dallavalle曳力模型对床层膨胀高度和整体固含率的预测精度较高;BVK、Syamlal-O’Brien以及Dallavalle曳力模型给出的床内固含率径向分布较为准确;BVK曳力模型较为准确地再现了颗粒轴向速度的径向分布特征。BVK曳力模型的影响机制与液固散式流态化中颗粒动力学特性相符合,在所考察范围内其预测性能最优;Dallavalle曳力模型在其余5个传统模型中预测性能较优且形式简洁在程序中易于实现。
Drag model plays one of important roles for CFD simulation of multiphase flows. Six drag models proposed by Gidaspow
Syamlal-O Brien
Di Felice
Gibilaro
Dallavalle and BVK are compared for predicting homogeneous liquid-solid fluidization in this study. CFD simulations are conducted based upon a simplified inviscid two-fluid model proposed by Brandani and Zhang in a commercial platform together with user-defined FORTRAN subroutines. Typical experimental data including a wide range of particle Reynolds numbers from reference literatures are employed to evaluate numerical simulation. The results show that either BVK model or Dallavalle model could predict the bed expansion and overall solids holdup very well. The radial profiles of solids holdup predicted by BVK
Syamlal-O Brien as well as Dallavalle model are more accurate
and that the BVK drag model provides better prediction for the radial profile of solids axial velocity. Generally
the BVK drag model demonstrates the best performance for modelling hydrodynamics in homogeneous liquid-solid fluidization as its mechanism is corresponding with the kinetic behavior of particles in liquid-solid system. Taking both prediction accuracy and model complexity into consideration
Dallavalle drag model seems to be the optimal choice among the rest of the drag models.
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