Open Access
 Issue JNWPU Volume 38, Number 4, August 2020 792 - 796 https://doi.org/10.1051/jnwpu/20203840792 06 October 2020

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

## 1 测量原理及结构设计

LFM是根据Hagen-Poiseuille Law设计的, 即当牛顿流体流经一圆形管道时, 若温度、管径等参数不变, 管内流体处于层流状态, 则流量qv与压降Δp成正比, 如(1)式所示。一般认为管道内流体雷诺数Re < 2 300时处于层流状态, 对应计算公式如(2)式所示。

(3) 式中包含两部分内容, 一部分是Re, 代表的是流量的大小; 另一部分是长径比l/d, 代表的是LFM的流道结构。(3)式表明, 当Re足够小, 且长径比l/d足够大时, 层流压损将占绝大多数, 此时忽略掉其他非线性因素LFM仍然可以保证足够的精度。(3)式衡量的是长径比确定条件下, LFM可测量最大流量能力的大小。

1) 片式LFM提出时主要考虑用于内燃机进气, 流量较大, 流道宽深比设计过大, 导致结构刚性较差, 使用时受气流影响极易震动、形变, 从而失效;

2) 图4结构的片式LFM难以解决密封问题, 存在如图5所示的泄漏问题, 使得片式LFM在测量主流时误差增大, 同时还会在主流中混入外界环境气体, 从而完全无法使用。

 图1LFM结构示意图
 图2两种常见LFM
 图3LFM压差示意图
 图4片式LFM主视图和俯视图
 图5片式LFM泄漏示意图
 图6小型片式层流LFM

## 3 试验及结果分析

 图7qv-Δpm拟合直线

## References

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## All Figures

 图1LFM结构示意图 In the text
 图2两种常见LFM In the text
 图3LFM压差示意图 In the text
 图4片式LFM主视图和俯视图 In the text
 图5片式LFM泄漏示意图 In the text
 图6小型片式层流LFM In the text
 图7qv-Δpm拟合直线 In the text

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