超声波气体流量计降噪整流器优化设计

Optimal Design of Noise Reduction Rectifier for Ultrasonic Gas Flow Meters

通过建立装置三维模型,运用Ansys对超声波气体流量计的降噪整流装置结构模型进行流场分析,从而实现对整流器的优化设计。通过模拟研究,发现当降噪单元的前挡板、后挡板、挡圈的直径分别为70、70、60mm,且整流单元的一级整流管束圆孔和二级整流管束圆孔的主孔、隙孔直径分别为3. 0、3. 0mm和3. 5、3. 2mm,长度分别为20、40mm时,出口处的气体流速不均匀性可以降低至0. 872。该结构显著提高了超声波气体流量计的整体性能。

Through establishing a 3D model of the device and analyzing flow field of the structural model of the noise reduction rectifier with Ansys software,the rectifier’s optimal design was realized. Simulation study shows that,when diameter of the de-noising unit’s front baffle,back damper,and retaining ring stays at 70 mm,70 mm and 60 mm respectively,and diameter of the rectifier tube bundle’s round hole of the primary rectifying unit and that of the secondary rectifier tube bundle is 3. 0 mm,3. 5 mm and 3. 2 mm respectively along with a thickness of 20 mm and 40 mm respectively,the nonuniformity of exit gas flow rate can be reduced to0. 872. This structure can significantly improve the overall performance of ultrasonic gas flow meter.