Numerical simulation and experimental study of z-path ultrasonic heat meter based on TDC-GP21

2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Pub Date : 2013-05-06 DOI:10.1109/I2MTC.2013.6555504

Xiaoyu Tang, Hongjian Zhang, Hongliang Zhou, Binbin Yao

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Abstract

Ultrasonic heat meters have being widely applied in the industrial and commercial heat measurement. The precision of an ultrasonic heat meter depends on two aspects: the accuracy of time measurement and the relationship of average velocity detected between the two ultrasonic transducers and the inlet average velocity of the pipe (here is a factor k standing for it). Different mass fluxes lead to different situations of the flow field, which means that factor k varies with Reynolds number. In this paper, Z-path is designed to avoid blocking in the pipes. Lager Eddy Simulation (LES) model is used to calculate the flow field of the transition region in the CFD numerical simulation and a regular pattern of this Z-path heat meter is proposed from the simulation results. The TDC-GP21 chip is adopted to offer precise time measurement and experimental results in laboratory show that this kind of ultrasonic heat meters provide high measuring precision and are advantageous to apply in civil use.

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基于TDC-GP21的z路超声热计的数值模拟与实验研究

超声波热计在工业和商业热测量中得到了广泛的应用。超声波热计的精度取决于两个方面:时间测量的精度和两个超声波换能器之间检测到的平均速度与管道进口平均速度的关系(这里用系数k表示)。不同的质量通量导致不同的流场情况，这意味着因子k随雷诺数而变化。在本文中，z路径的设计是为了避免管道堵塞。在CFD数值模拟中，采用Lager Eddy Simulation (LES)模型对过渡区的流场进行了计算，并根据模拟结果提出了该z路径热计的规律。采用TDC-GP21芯片进行精确的时间测量，实验室实验结果表明，该超声热量表测量精度高，有利于民用应用。

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2013 IEEE International Instrumentation and Measurement Technology Conference (I2MTC)

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