Investigation of the flow velocity profile in a metering section of an invasive ultrasonic flowmeter
Investigation of the flow velocity profile in a metering section of an invasive ultrasonic flowmeter
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DOI：
10.1016/j.flowmeasinst.2005.11.004
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发表时间：
2006-08-01
影响因子：
2.2
通讯作者：
Raisutis, Renaldas
中科院分区：
文献类型：
--
作者：
Raisutis, Renaldas
本文介绍了一种利用侵入式流量传感器（热风速计）在超声波流量计槽内测量局部流速分量的方法和实验结果。研究了湍流气流（4000 < Re < 19000）和流速从14 m(3)/h到55 m(3)/h通过计量段的传播。由于凹槽的气动特性，估计管道内的流动轮廓是不对称的。因此，由于进气，流型曲线向下游凹槽倾斜。靠近管壁和凹槽腔边界处的流动波动较大。凹槽腔内的流速形状复杂，且取决于管内的流速。在超声换能器表面附近，上游凹槽内的流速要大几倍以上。然而，在远离换能器表面的地方，由于凹槽腔内的涡流运动，下游凹槽内的流速较大。在实验中观察到，由于凹槽，计量段的流速降低。(c) 2005 Elsevier Ltd版权所有。
This paper describes a methodology for measurement and experimentally obtained results of local flow velocity components using invasive flow sensors (thermoanemometers) in the transit time ultrasonic flowmeter recesses. The investigations of the turbulent air flow (4000 < Re < 19000 and flow rate from 14 m(3)/h up to 55 m(3)/h) propagation through the metering section were performed. It was estimated that the flow profile in the pipe is asymmetric due to aerodynamic properties of the recesses. Therefore, due to air intake, the curve of the flow profile is inclined to the downstream recess. Bigger flow fluctuations were obtained close to the boundaries between walls of the pipe and cavities of the recesses. The flow velocity in the cavity of the recess has a complicated shape and depends on the flow velocity in the pipe. Near the surface of ultrasonic transducer the flow velocity is more than a few times bigger in the upstream recess. However, far away from the surface of the transducer, due to vortex motion in the cavity of the recess, the flow velocity is bigger in the downstream recess. The reduction in flow velocity in the metering section, due to recesses, was observed experimentally. (c) 2005 Elsevier Ltd. All rights reserved.