Sharp optimization of hydrocyclone based on Fluent mesh morphing

doi:10.16085/j.issn.1000-6613.2016.08.08

Abstract

Abstract: Currently,fluid-structure optimization of hydrocyclone has been mainly limited to single-parameter size optimization. Generally,the optimization process is dependent upon the method of separate simulation with multiple sets of grid. Nevertheless,the approach is time-consuming and not capable of controlling the micro size deformation. Besides,further improvement on the separation efficiency of cyclone is rather difficult once a certain maximum optimization is achieved. To solve this problem,mesh deformation-based shape optimization method was proposed. Aimed at improving the hydrocyclone separation efficiency with ANSYS Fluent mesh deformation method,the hydrocyclone sharp structure was optimized and the hydrocyclone separation efficiency was increased from 95.69% to 99.18%. A comparative analysis involved with pressure drop,velocity and oil phase volume distributions before and after optimization was then conducted. The results indicated that the smoothing mesh deformation driven grid nodes by Fluent mesh morpher could concurrently contribute to the optimal combination of structural parameters in the deformation zone,and the optimization of the automation and intelligentization of the iteration process. Besides,it had a considerable capability of global searching and strong robustness. Fluent mesh morphing optimization algorithm can shorten CAD modeling time,avoid mesh reconstruction and further improve the separation efficiency of hydrocyclone within a certain range on the basis of single-parameter size optimization.

Key words: sharp optimization, mesh morphing, separation efficiency, axial cyclone, objective function

摘要： 目前，旋流器的流体结构优化主要局限于单参数的尺寸优化；大多采用多组网格分别模拟的方法；不仅费时，而且对于微小的尺寸变形常常难以操控。当旋流器的分离效率优化到一定峰值后，进一步提高则比较困难。为解决这一问题，提出了基于网格变形的形状优化方法。以旋流器的分离效率为目标，采用ANSYS Fluent的网格变形方法，优化了旋流器的外形结构，将旋流器的分离效率由原来的95.69%提高到了99.18%，并对比分析了优化前后的压降、速度和油相体积分布。研究结果表明：Fluent 网格变形器驱动网格节点的平滑变形，可以同时实现变形区域的结构参数的优化组合，以及优化迭代的自动化和智能化，具有良好的全局搜索能力和较强的鲁棒性；Fluent网格变形优化算法能够缩短CAD建模的时间，避免网格重构；可在单一尺寸优化的基础上，在一定范围内提高旋流器的分离效率。

关键词: 形状优化, 网格变形, 分离效率, 轴流式旋流器, 目标函数

CLC Number:

TQ028.4

JIANG Minghu, TAN Fang, JIN Shuqin, LONG Guilan, CHEN Guiqin, XU Baorui. Sharp optimization of hydrocyclone based on Fluent mesh morphing[J]. Chemical Industry and Engineering Progree, 2016, 35(08): 2355-2361.

蒋明虎, 谭放, 金淑芹, 龙桂兰, 陈桂芹, 徐保蕊. 基于Fluent网格变形的旋流器的形状优化[J]. 化工进展, 2016, 35(08): 2355-2361.

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