针对1m以上大口径异型方管转弯部分长度较短、前后段没有较长的直管,管道内部流场复杂、需准确测量管道流量的问题,进行了数值模拟分析。提出了一种基于变差系数的平均速度评价方法,选出多点最接近管道平均流速的位置,明确传感器插入深度和多个测量点的权重系数,拟合出1个以截面平均速度为函数,流场中多点的流速值为自变量的计算公式。在风洞实验台进行流量测量试验,并与数值分析拟合的公式计算值进行比较,满量程相对误差小于0.54%。
Abstract
For large-diameter irregular square pipes with a diameter exceeding 1m, where the length of the curved section is short and there are no long straight pipes before and after, and the flow field inside the pipe is complex, there is a need for accurate measurement of the pipe flow. In this regard, a numerical simulation analysis is conducted, proposing a mean velocity evaluation method based on the coefficient of variation. This method selects multiple points that best represent the average flow velocity of the pipe, determining the insertion depth of the sensors and the weight coefficients of multiple measuring points. A calculation formula is then derived, with the cross-sectional average velocity as the function and the velocity values at multiple points in the flow field as the independent variable.Flow measurement experiments are conducted on a wind tunnel test bench, and the calculated values obtained from the formula derived through numerical analysis are compared. The relative error within the full range is less than 0.54%.
关键词
流量测量 /
风洞实验 /
数值模拟 /
变差系数法 /
热质流量计 /
异型方管
Key words
flow measurement /
wind tunnel test /
numerical simulation /
coefficient of variation method /
thermal mass flowmeter /
irregular square pipe
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基金
国家自然科学基金(51279172);四川省流体机械重点实验室开放研究基金(szjj2016-002)
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