摘要
气体超声流量计用于城市燃气管线的用气计量己成为精确计量的趋势。为满足所需的计量精度和稳定性,流量计在设计时须考虑燃气在管道输送中不同雷诺数的流场下线速度的分布规律,设计合理的声道走向结构,减少紊流干扰造成流量计的测量不稳定性。研发了三维"Z"形声道的气体超声流量计,并对公称直径50 mm~200 mm的流量计进行试验,结果表明:三维"Z"形声道气体超声流量计能有效避开管线轴中心线上高流速区域,在流量范围内,用时差法测量气流流速与流过管道内的平均计算流速在一定的雷诺数范围内有恒定函数关系,从而提高气体超声流量计的计量精度和稳定性。
Gas Ultrasonic Flow Meters for gas metering in urban gas pipelines have become the trend of accurate measurement. In order to meet the required measurement accuracy and stability, it should take into account the downstream velocity distribution of different Reynolds in pipeline transportation to design a reasonable channel direction structure to reduce turbulence. Interference causes the measurement instability of the flow meter. For this reason, Fujian Hard Co., Ltd. has developed a three-dimensional "Z" sound channel gas ultrasonic flow meter. The flow meter test from the nominal diameter of 50 mm to 200 mm proves that the gas ultrasonic flow meter of the three-dimensional "Z" channel can effectively avoid the high-flow velocity area on the centerline of the pipeline shaft. Within the flow range, the average calculated flow velocity of airflow and flow through the pipeline by time difference method has constant function relationship within a certain range of Reynolds numbers so as to improve the measurement accuracy and stability of the gas ultrasonic flow meter.
作者
郑庆煊
ZHENG Qingxuan(AISTER Instrument(Shanghai)Co.,Ltd.,Shanghai 200000,China)
出处
《仪表技术》
2021年第5期49-51,共3页
Instrumentation Technology
关键词
燃气计量
气体超声流量计
“Z”形声道
高精度
gas metering
gas ultrasonic flow meter
"Z"acoustic channel
high accuracy
