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一、前言作为结构上非常坚固而简单的流量计——孔板、文丘利背和喷咀,多年来已被广泛的应用于各种设备的流量测量,而这些流量计的缺点是在低雷诺数区域进行测量时受到一定的限制,也就是说,这些流量计所产生的差压被限制在雷诺数4000以上的紊流区域内。如果使用在4000以下时,这种流量计所具有的差压和流量之间的关系完全失去了平方特性,对测量的精度有很大影响。
I. Introduction As a very solid and simple structure of the flow meter - orifice, venturi back and nozzle, over the years has been widely used in various devices flow measurement, and the disadvantage of these flowmeter is low Reynolds Several areas are subject to some restrictions when measuring, that is, the differential pressure generated by these flowmeters is limited to a turbulence area above 4000 Reynolds number. If used below 4000, the differential pressure and flow rate of the flowmeter with this relationship between the total loss of squareness, the accuracy of the measurement has a great impact.