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在气体和蒸汽流量的测量中,流量与被测介质的温度、压力和密度有关。目前,采用标准节流装置孔板进行流量测量是使用较多的方法之一,通过测量孔板前后压差ΔP,孔板前气体及蒸汽的表压力P,温度t,用校正公式可算出介质的标准质量流量。在常规仪表中,流量Q与孔板前后压差ΔP的平方根成正比,当介质、孔板的开孔截面积一定,气体及蒸汽的流量校正公式简化如下
In the measurement of gas and steam flow, the flow is related to the temperature, pressure and density of the measured medium. At present, the use of standard orifice orifice flow measurement is one of the more ways to use, by measuring the orifice before and after the pressure difference ΔP, orifice gas and steam table pressure P, temperature t, with the correction formula can be calculated media Standard mass flow. In a conventional meter, the flow rate Q is proportional to the square root of the differential pressure ΔP before and after the orifice. When the cross-sectional area of the orifice of the medium or orifice is constant, the flow rate correction formula for gas and vapor is simplified as follows