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中南大学学报(自然科学版)

Journal of Central South University

第46卷    第3期    总第247期    2015年3月

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文章编号:1672-7207(2015)03-0812-10
金属纤维多孔烧结板复杂网状模型的主动设计及传输特性仿真
王清辉,李伟晨,黄祥,李静蓉

(华南理工大学 机械与汽车工程学院,广东 广州,510640)

摘 要: 提出一种针对金属纤维多孔烧结结构的主动设计方法。该方法基于Micro-CT扫描,对金属纤维多孔烧结板在不同工艺参数下模压成形样本进行三维重建,对其骨架网络的微观分布特征进行统计分析;提出与烧结板成形规律相映射的概率分布模型及参数驱动设计方法;基于该主动设计模型,采用计算流体力学仿真探究不同微结构分布特征对其流体传输特性的影响机制。研究结果表明:在正态分布概率密度函数控制下,主动设计模型中纤维段长度、角度分布规律与实测结果基本吻合;纤维板纤维孔隙结构对流体流速有增强效果且随孔隙率升高呈递减趋势;在相同入口流速条件下,压降随烧结板孔隙率升高呈递减趋势;烧结板内流体流速增强效果随正态分布方差的减小呈增加趋势。

 

关键字: 金属纤维多孔结构;微结构设计;流动仿真

Microstructure design of random metal fibrous structure and its transport properties simulation
WANG Qinghui, LI Weichen, HUANG Xiang, LI Jingrong

School of Mechanical & Automotive Engineering, South China University of Technology, Guangzhou 510640, China

Abstract:An approach of microstructure design for random metal fibrous structure was proposed. A variety of the material’s microstructures under different fabrication configurations were investigated utilizing micro-CT screening, skeleton network reconstruction, and characteristics analysis. A parametric-driven modeling algorithm was developed to address the effective description of the random fibrous network, which could be mapped with fabrication configurations. The influence of the characteristics of the complex network on fluid transport properties was investigated by CFD simulation. The results show that distribution of fibre length and angle, which is controlled by normal probability density function, is basically consistent with the data of measured samples; that fiber pore structure has enhancement effect on fluid velocity that tends to decline with increased porosity; that under the condition of same entrance velocity, pressure drop decreases with the increase of the porosity; and that the internal fluid velocity in the fibrous network tends to increase faster with a decreased variance of normal distribution.

 

Key words: metal random fibrous structure; microstructure design; fluid simulation

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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