This method is based on the measurement of the rate of air flow through a given area of fabric by a given pressure difference across the fabric.

这个方法是基于对空气流速的测量：在一块既定面积的面料上，通过面料两边不同的压差来获得。

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In this paper, the limitation and shortage of the open channel flow measurement are pointed out based on the review of the flow measurement methods and velocity distribution in open channel.

本文首先综述了明渠断面流量测量方法以及明渠断面流速分布的研究现状，在此基础上，指出了目前明渠断面流量测量方面的缺陷和不足。

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Based on the measurement of flow field, the particle concentration distribution in the PDC type cyclone tube was studied by isokinetic sampling method.

在流场测试的基础上，采用等动采样的原理，对PD C型旋风管内的颗粒浓度分布进行了全面系统地测试。

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