MRF方法下旋转内域对流场特性及转矩的影响

摘要多重参考系法(MRF)常用于搅拌过程的数值模拟研究,但此方法中旋转内域尺寸的讨论尚不充分,已有的研究结论也仅适用于特定尺寸搅拌结构。对装配Rushton叶轮的搅拌筒中搅拌过程进行数值模拟,与实验数据比较,确定搅拌模拟中最适宜旋转内域尺寸,提出了适用于不同搅拌筒结构的旋转内域划分依据,并研究了内域尺寸对计算转矩的影响。结果表明,在MRF方法下,内外域交界面位置的影响主要在叶轮排出流方向,旋转内域尺寸对转矩的影响小于5%。提出内域直径Z=(d_in-D)/(T-2b-D)的定义方式,在Z=0.29时划分出旋转域的数值模拟准确性最高,且不受搅拌筒叶轮和挡板间相对大小的限制,可为MRF方法下旋转域尺寸选择提供理论参考。

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	张威
	陈琛
	刘盼盼

关键词：搅拌筒多重参考系法旋转内域搅拌转矩

Abstract： The Multi-Reference Frame (MRF) method is commonly used in the numerical investigation of mixing process, however, the discussion on the size of the rotational domain is not well developed. Numerical simulations of the stirring process in a Rushton impeller mixing tank were carried out. By compared with experimental results, the optimum inner zone size was determined, and discussion on the height of the inner zone was complemented. In addition, the basis for dividing the rotating inner zone applicable to different mixing cylinder structures was proposed. The results show that the influence of the interface position is mainly in the direction of the impeller discharge flow, and the influence of the inner zone on the torque calculation is less than 5%. The proposed definition of inner domain diameter Z=(d_in-D)/(T-2b-D) can be applied to mixing equipment of different structures, the accuracy of numerical simulations is highest when the inner zone is delineated at Z=0.29, which can provide a theoretical reference for the selection of the rotating zone size under the MRF method.

Keywords： stirred tank multi-reference frame method inner rotating zone torque

Received 2023-10-31;

Fund:北京市自然科学基金(3194046);宁夏重点研发计划项目(2019BFG02016)。

Corresponding Authors: 张威,副教授,E-mail:zhangwei1@bucea.edu.cn。 Email: zhangwei1@bucea.edu.cn

About author: 陈琛(1998-),男,硕士研究生,现从事固液两相流数值模拟方面的研究。

引用本文:

张威, 陈琛, 刘盼盼.MRF方法下旋转内域对流场特性及转矩的影响[J]. 化学工业与工程, 2024,41(4): 169-178

ZHANG Wei, CHEN Chen, LIU Panpan.Influence of rotating inner zone on the characteristics of flow field and torque simulated by MRF method[J]. Chemcial Industry and Engineering, 2024,41(4): 169-178

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