Volume 38, Number 4, August 2020
|Page(s)||792 - 796|
|Published online||06 October 2020|
Research of Small Sheet-Type Laminar Flow Meter
School of Power and Energy, Northwestern Polytechnical University, Xi'an 710072, China
A small sheet-type LFM is proposed to solve the problems of leakage and deformation in the design of traditional sheet-type LFM. The pressure tap is set in the middle of the laminar flow channel to extract pressure from the fully developed laminar flow. The design value Remax·de/l is 5.81, which is much higher than the 2~2.5 required by the traditional design. Experimental results show that the linearity factor ξL of small sheet-type LFM can reach 0.81% and the accuracy is up to 1%, which shows that the present design can effectively overcome the nonlinear effects caused by sudden expansion and contraction. In addition, when the flow rate is above 20% designed maximum valve, the calculation error of pressure drop can be controlled below 5.42%.
Key words: laminar flow meter / sheet-type / sudden expansion and contraction / linearity / accuracy
关键字 : 层流流量计 / 片式 / 突扩突缩 / 线性度 / 精度
© 2020 Journal of Northwestern Polytechnical University. All rights reserved.
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