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。
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.
另外，还可选择双向差压传感器，从而测量气流双方向流动时的正负流量。
In addition, two-way differential pressure sensor can measure plus-minus flow when air flow in both directions.
模拟了开门过程病房内外压差的变化，门附近的流场状况，以及进出门气流的变化状态，探讨了开门对污染物扩散的影响。
Simulates the changes of pressure difference, velocity field and the air flow in the door opening process, and discusses the influence to the contamination dispersion.
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