涡轮流量计计量稳定性影响成因分析

分析前置导流体出流速度对涡轮流量计计量精度影响成因,在流量测量范围内对某型号涡轮流量计前置导流体流道内的速度分布进行模拟。叶轮角速度与气体流入叶轮绝对流速成正相关,由于叶轮角速度直接影响涡轮流量计计量稳定性,因此研究前置导流体流道内的速度分布能为提高涡轮流量计计量稳定性提供理论依据。流道内空气流速随着流量的增大而增大,且最大流速区随流量的增大向前置导流体中心线偏移。空气流量8、32、64、160 m3/h对应的最大流速区的最大流速分别为0.86、3.61、7.37、18.92 m/s。

Causes Analysis of Influence on Measurement Stability of Turbine Flowmeter

The causes of the influence of the outflow velocity of the pre-deflector on the measurement accuracy of the turbine flowmeter are analyzed,and the velocity distribution in the pre-deflector channel of a certain type of turbine flowmeter within the flow measurement range is simulated. The angular velocity of the impeller is positively correlated with the absolute flow velocity of the gas flowing into the impeller. Since the angular velocity of the impeller directly affects the measurement stability of the turbine flowmeter, the study on the velocity distribution in the pre-deflector channel can provide theoretical basis for improving the measurement stability of the turbine flowmeter. The air velocity in the flow channel increases with the increase of the flow,and the maximum velocity area shifts to the center line of the pre-deflector with the increase of the flow. The maximum flow velocities in the maximum velocity area corresponding to the air flow rates of 8,32,64,and 160 m3/h are 0. 86,3. 61,7. 37,and 18. 92 m/s,respectively.