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山东大学学报 (工学版) ›› 2019, Vol. 49 ›› Issue (6): 119-126.doi: 10.6040/j.issn.1672-3961.0.2019.503

• 机械与能动工程 • 上一篇    

基于孔隙尺度下丝网多孔介质通道流阻特性

胡伟()   

  1. 济南市生态环境局历城分局, 山东 济南 250100
  • 收稿日期:2019-09-03 出版日期:2019-12-20 发布日期:2019-12-17
  • 作者简介:胡伟(1969—)，男，山东济南人，高级工程师，主要研究方向为环境保护工程及技术. E-mail：lcjsxmk@163.com

Flow resistance characteristics of wire mesh porous media channel based on pore-scale

Wei HU()   

  1. Licheng Branch, Jinan Municipal Bureau of Ecological Environment, Jinan 250100, Shandong, China
  • Received:2019-09-03 Online:2019-12-20 Published:2019-12-17

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摘要：

基于丝网多孔介质孔隙通道数值分析,研究不同几何参数的丝网多孔介质通道内的流阻特性ΔP、黏性阻力Au与惯性阻力Bu2等变化特性。通过CFD软件建立三维稳态修正k-ω湍流模型保证计算精度,并选择5种不同丝径和孔径的4单元孔隙模型,开展低入口流速范围内的流阻特性研究。根据数值分析结果,得到不同构型下孔隙级通道的流阻特性,显示出构型对丝网通道内非线性流动阻力特性产生的显著影响。结果表明,丝网构型角度越小(θ=45°~90°),通道内流动阻力越大,而分压占比规律一致;流速越大(v=0.2~1.0 m/s),则非线性作用越大,惯性阻力占比越多。

关键词: 数值模拟, 几何构型, 丝网多孔介质, Forchheimer模型, 压降

Abstract:

Through the pore-scale of the mesh porous media channel numerical analysis, the flow resistance characteristics of wire mesh channel with different geometric parameters were studied, including pressure drop ΔP, viscous resistance Au and inertial resistance Bu2. A three-dimensional steady-state modified k-ωturbulence model was developed by CFD software, and five four-cell pore models with different wire diameters and pore diameters were selected. Numerical analysis on flow resistance characteristics in wire mesh velocity numbers, i.e., from 0.2 m/s to 1.0 m/s were performed. The characteristics of flow in pore-level channels with different configurations under the range of low velocity numbers were obtained. It was shown that the configuration had a significant influence on the nonlinear flow characteristics of the wire mesh channel. The results showed that the smaller the mesh configuration angle (θ=45°~90°), the greater flow resistance in the channel, however, the partial pressure ratio was the same. It also indicated that faster the flow velocity (v=0.2~1.0 m/s), the greater the nonlinear effect and more inertial resistance would be.

Key words: numerical simulation, geometric structure, wire mesh porous media, Forchheimer model, pressure drop

中图分类号: 

  • TB71+2

图1

金属丝网"

图2

单元金属丝网"

表1

丝网多孔介质的结构参数"

丝网构型 纬丝d2/mm 径丝d1/mm 孔径M1/mm 孔径M2/mm 夹角θ1/(°) 夹角θ2/(°)
W45 0.1 0.1 0.3 0.3 45 45
W60 0.1 0.1 0.3 0.3 60 60
W75 0.1 0.1 0.3 0.3 75 75
W90 0.1 0.1 0.3 0.3 90 90

图3

丝网多孔介质孔隙级通道模型"

图4

W90网格无关性验证"

图5

W90模拟数据与经验公式对比"

图6

W75模拟数据与经验公式对比"

图7

W60模拟数据与经验公式对比"

图8

W45模拟数据与经验对比"

图9

W90流速与压降的关系"

图10

W75流速与压降的关系"

图11

W60流速与压降的关系"

图12

W45流速与压降的关系"

表2

不同结构形式丝网的拟合参数"

丝网 A B K F R2
W90 106.31 439.17 9.93e-10 0.138 99.94
W75 112.81 472.29 9.20e-10 0.143 99.96
W60 140.75 559.53 6.80e-10 0.146 99.67
W45 212.37 832.06 4.70e-10 0.180 99.96

图13

Forchheimer系数A、B与丝网角度关系"

图14

流速与压降的关系"

图15

流速与各阻力占比关系"

图16

丝网角度与压降关系"

图17

丝网结构角度与惯性占比的关系"

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