槽道式标准气体实流检定系统设计OA

In order to solve the problems of long inspection cycle,low inspection efficiency,and poor stability of current gas real flow calibration standard devices,a miniaturized gas real flow calibration system is designed based on the standard meter method using a channel flowmeter as the standard meter.Firstly,the principle of the standard meter gas flow calibration system is explained,the per-formance indicators of commonly used flow meters in the industrial field are compared,and it is proved that the channel flow meter is feasible as the standard meter for gas flow calibration system.Secondly,the overall system pipeline and pipe diameter are designed,the impact of upstream bend pipe distance on the measurement performance of the standard meter is simulated.The system pipeline is opti-mized through overall model simulation,the horizontal velocity distribution of the channel flowmeter section and the vertical velocity dis-tribution of the channel flowmeter inlet/outlet section in numerical simulation are extracted,and the optimal pipeline design model is ul-timately determined.Finally,under the operating conditions of a temperature of 20℃and a pressure of 101.325 kPa,experiment is con-ducted with dry air of ρ0=1.205 kg/m3.Based on the experimental data,the outflow coefficient of the channel standard meter is calcu-lated to be 0.944 5,and the overall system experimental repeatability is 0.048％.