采用不同曲面叶片叶轮的搅拌槽中流动特性的应力混合涡流模拟

IF 3.8 3区 工程技术 Q3 ENERGY & FUELS Chemical Engineering and Processing - Process Intensification Pub Date : 2024-10-02 DOI:10.1016/j.cep.2024.110015
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引用次数: 0

摘要

高性能叶轮对于加强搅拌槽中的物料混合至关重要。本研究采用应力混合涡流模拟(SBES)模型和滑动网格方法,对搅拌槽中不同曲面叶片叶轮(包括交错扇形抛物面圆盘涡轮(SFPDT)、后掠抛物面圆盘涡轮(SPDT)、非对称交错抛物面圆盘涡轮(ASPDT)和传统抛物面圆盘涡轮(PDT))产生的流动特性进行了数值研究。在成功验证预测精度后,系统地评估了 SFPDT、ASPDT、SPDT 和 PDT 在搅拌槽中的功率特性、平均流、湍流特性、湍流动能(TKE)传输和尾涡行为。结果表明,ASPDT 会导致速度、TKE 和尾涡在轴向出现明显的不对称分布,但径向射流在径向的减少更为严重。扇形几何形状限制了不对称交错结构对 SFPDT 的 TKE 和尾涡分布的影响。SPDT 的后掠叶片结构导致了最低的功率数和 TKE 值水平。这些结果为进一步开发和应用高效叶轮奠定了基础。
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Stress-blended eddy simulation of flow characteristics in stirred tanks with different curved blade impellers
A high-performance impeller is crucial for enhancing material mixing in a stirred tank. In this work, the flow characteristics created by different curved blade impellers including staggered fan-shaped parabolic disc turbine (SFPDT), swept-back parabolic disc turbine (SPDT), asymmetric staggered parabolic disc turbine (ASPDT) and traditional parabolic disc turbine (PDT) in stirred tanks are investigated numerically by using the stress-blended eddy simulation (SBES) model with a sliding mesh approach. After successful validation of prediction accuracy, power characteristics, mean flow, turbulence characteristics, turbulent kinetic energy (TKE) transport, and trailing vortices behaviors of SFPDT, ASPDT, SPDT and PDT in stirred tanks are systematically evaluated. The results show that ASPDT leads to a significant asymmetric distribution in the axial direction for velocity, TKE and trailing vortices, but the radial jet reduces more severely in the radial direction. The fan-shaped geometry constrains the influence of asymmetric staggered structure on the TKE and trailing vortices distribution for SFPDT. The swept-back blade structure of SPDT results in the lowest power number and TKE values level. These results provide a foundation for the further development and application of high-efficiency impellers.
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来源期刊
CiteScore
7.80
自引率
9.30%
发文量
408
审稿时长
49 days
期刊介绍: Chemical Engineering and Processing: Process Intensification is intended for practicing researchers in industry and academia, working in the field of Process Engineering and related to the subject of Process Intensification.Articles published in the Journal demonstrate how novel discoveries, developments and theories in the field of Process Engineering and in particular Process Intensification may be used for analysis and design of innovative equipment and processing methods with substantially improved sustainability, efficiency and environmental performance.
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