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一、装置不确定度分析本文以检定家用膜式燃气表的音速喷嘴法燃气表检定装置(以下简称“装置”)为例,对其不确定度和检定注意事项进行探讨。流经音速喷嘴的体积流量q_v可按下式计算:式中:q_v——通过音速喷嘴的体积流量;C_d——音速流喷嘴的流出系数;A_*——音速喷嘴喉部的截面积;C_*——气体的临界流函数;p_0——喷嘴前气体的绝对滞止压力;T_0——喷嘴前气体的绝对滞止温度;p——被检燃气表处的气体压力;T——被检燃气表处的气体温度;z——压缩系数;M——气体的摩尔质
First, the device uncertainty analysis In this paper, the home-made membrane gas meter sonic nozzle gas meter testing device (hereinafter referred to as “device ”) as an example, to discuss its uncertainty and test considerations. Volume flow q_v flowing through the sonic nozzle can be calculated as follows: where: q_v - the volume flow through the sonic nozzle; C_d - the outflow coefficient of the sonic stream nozzle; A _ * - the cross-sectional area of the sonic nozzle; C_ * - the critical flow function of the gas p_0 - the absolute stagnation pressure of the gas before the nozzle; T_0 - the absolute stagnation temperature of the gas before the nozzle; p - the gas pressure at the gas meter being inspected; T - Gas temperature at gas meter; z - Compressibility; M - Molar mass of gas