空滤器滤芯声学特性的仿真方法

Simulation methods for acoustical characteristics of air-cleaner filter element

通过实验测量装有滤芯的滤芯安置装置的消声量,结合声学有限元仿真方法,确定滤芯的声学特性参数.结果显示,采用有限元法可以用来分析滤芯声学特性.应用计算流体动力学(CFD)法计算不带滤芯和带滤芯时滤芯安置装置及空滤器的消声量,不带滤芯时采用CFD法得到的计算结果与测量结果吻合良好,带滤芯时采用CFD法得到的计算结果比有限元法计算结果误差更大.研究采用有限元法和CFD法分析滤芯声学特性时的特点,提出基于CFD法的提取和设置滤芯声学特性参数的工程方法.

The noise reduction of the filter-setting equipment with a filter element in it was measured to determine the acoustical parameters of the filter element, by combining with finite element method （FEM）. Results show that FEM can be used to analyze the acoustical properties of the filter element. A computational fluid dynamics （CFD） approach was employed to calculate noise reductions of both the filter- equipment and an air-cleaner with and without the filter element. The CFD-caleulated results agreed well with the measured results when the filter element was not installed. However, when the filter element was installed, the CFD-calculated result showed greater error than the FEM-calculated results. Features of the FEM and CFD approach of analyzing acoustical properties of the filter element were analyzed. A CFD- based engineering approach was proposed to determine and set acoustical parameters of a filter element.