针对时差法超声波流量计在小管径流量测量方面存在的问题,提出了一种内置反射装置的缩管径超声波流量计。采用FLUENT仿真软件,以管道内各声路上的K系数及均方根误差为评定标准,研究了反射片的形状、特征尺寸、反射片的间距及管道的缩进对管内流场特性的影响,设计了最佳管道模型,并计算出该模型在各流量点下的K系数。仿真结果表明所设计超声波流量计流场稳定,能够提高小管径测量的测量精度。
Abstract
In order to solve the problem of small pipe measurement of transit-time ultrasonic flowmeter, the inner acoustic reflection device and tapered pipe were designed. The flow correct coefficient K and its RMS error were adopted as the evaluation standard. The shape, size and distance of the reflectors and the size of tapered pipe were studied with FLUENT software. Then the optimal pipe model was designed. The coefficients of the model at different flow points were also calculated. The simulation results showed that the flow pipe model is stable and can improve the accuracy of the small pipe measurement.
关键词
计量学 /
超声波流量计 /
小管径 /
时差法 /
K系数 /
仿真
Key words
Metrology /
Ultrasonic flow-meter /
Small pipe /
Transit-time /
Coefficient K /
Simulation
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基金
浙江省重点科技团队创新团队项目(2011R09024-05)
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