Research of Small Sheet-Type Laminar Flow Meter

• Format: Article
• Language: zho
• Published: The Northwestern Polytechnical University 2020-08-01
• Series: Xibei Gongye Daxue Xuebao
• Subjects: laminar flow meter; sheet-type; sudden expansion and contraction; linearity; accuracy
• Online Access: https://www.jnwpu.org/articles/jnwpu/full_html/2020/04/jnwpu2020384p792/jnwpu2020384p792.html

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%.