基于Fluent的微米木纤维过滤器理论实测分析与数值模拟  

Theoretical Analysis and Numerical Simulation of Micron Wood Fiber Filter Based on Fluent

作　　者：杨春梅[1] 郭明慧[1] 李明宝[1] 马岩[1] 刘睿[1] 

机构地区：[1]东北林业大学林业与木工机械工程技术中心,黑龙江哈尔滨150040

出　　处：《西北林学院学报》2017年第4期254-259,共6页Journal of Northwest Forestry University

基　　金：中央高校基本科研业务费专项资金(2572014EB04-02)

摘　　要：为研发高效率微米木纤维过滤器,分析过滤器的过滤机理,建立过滤器的数学模型并对过滤效率进行计算,利用Fluent对纤维过滤器的过滤特性进行仿真,验证该数学模型的描述是否准确。通过Lee和Liu单纤维截留效率建立其综合过滤效率的数学模型,对模型进行描述与假设,根据模型推导出过滤器过滤效率的公式并进行计算。结果表明,增大微米木纤维的比表面积,纤维过滤器过滤效率提高;增大滤芯填充密度时,过滤器总过滤效率也会提高。但当滤芯质量增大到一定程度的时候,过滤器过滤效率增长变缓,故保证过滤器内滤芯质量为一定量时,过滤效率达到最佳。在此基础上,利用Fluent对所建立模型进行验证。验证表明,研究的模型当迭代30次左右残差曲线开始接近平和,计算结果<默认的数量级,计算收敛。模型入口端面处的压力值最大,经过模型内部木纤维的层层阻隔,压力逐渐减小,在压力差的作用下,汽车尾气被排出模型外。In order to develop a high efficiency micron fiber filter,the filtration mechanism of the filter was analyzed. The mathematical model of the filter was established and the filtration efficiency was calculated. The filter characteristics of the fiber filter were simulated by Fluent software. The mathematical model was validated to test its accuracy. The mathematical model of comprehensive filtration efficiency was established by the interception efficiency of Lee and Liu single fiber,the model was described and deduced,from which the formula of filter filtration efficiency was deduced and calculated. It was found that increasing the specific surface area of micron fiber could improve the filtration efficiency of the fiber filter. When the packing density of the filter increased,the total filtration efficiency of the filter would be improved. But when the filter quality increased to a certain extent,the filter efficiency growth slowed down, so to ensure the filter quality for a certain amount, the filter efficiency to achieve the best. On this basis, the established model was verified by Fluent software. The residual curve was close to placid when the iteration was about 30 times ,and the calculation result was less than the default order of magnitude, and the calculation was in convergence. The pressure value at the inlet end of the model was the largest, and the pressure was reduced by the layers of the wood fibers inside the model. The vehicle exhaust was discharged outside the model under the pressure difference.

关 键 词：微米木纤维 数学模型 过滤效率 数值模拟 

分 类 号：S781.6[农业科学—木材科学与技术]