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超声波热量表作为一种较高精度的流体计量工具,在节能降耗方面发挥着巨大作用。本文分析了超声波热量表的工作原理及主要结构参数,并引入流量修正系数K对流量进行修正。基于Fluent软件,选用k-ε模型对超声热量表基表内的流场进行了三维数值模拟,通过计算及结果分析得到超声波热量表K系数及K系数标准差的分布规律,并探讨了超声波热量表最优声路的选择,缩管直径、反射装置轴向距离对基表内水流特性、K系数及K系数标准差的影响规律。数值模拟对热量表结构优化具有一定的指导作用。
Ultrasonic heat meter as a high-precision fluid measurement tools, energy saving play a significant role. This paper analyzes the working principle and main structural parameters of the ultrasonic heat meter, and introduces the flow correction factor K to correct the flow. Based on the Fluent software, the k-ε model was used to simulate the flow field in the ultrasonic heat meter base table. The distribution of the K-factor and K-factor standard deviation of the ultrasonic heat meter was obtained through the calculation and the result analysis. The influence of the choice of the optimal acoustic path, the diameter of the deflated tube and the axial distance of the reflecting device on the flow characteristics, K-factor and K-factor standard deviation of the base table. Numerical simulation of heat meter structure optimization has a guiding role.