THE CONCEPT OF PHYSICAL SIMULATION OF THE INFLUENCE OF MOISTURE ON THE WORK OF THERMOANEMOMETRICAL SENSORS
Keywords:moisture, gas, air, mass flow, volume flow, physical modeling, meter, flow meter, laboratory installation, thermo-anemometric sensor.
The relevance of taking into account the influence of moisture in the field of flow measurement and accounting of natural gas was considered. The results of the analysis of known technical solutions and concepts regarding the possibility of creating installations and laboratory stands that would implement physical modeling of the effect of moisture on primary measuring transducers and gas meters was presented. The physical influence of the humidity of the working environment on the functioning of thermo-anemometric sensors by changing the thermophysical parameters of the gaseous environment, primarily thermal conductivity and heat capacity, was revealed. The possibility of practical implementation of a laboratory installation based on a device with moisture generation as a component of the gas flow of a laboratory installation was substantiated. At the same time, the principle of mass measurement of generated moisture and the algorithmic dependence of the mass flow balance of the gas flow at the entrance and exit of the developed installation were used to implement physical modeling. The diagram of the functioning of the laboratory installation, the algorithm of its work with the indication of the purpose and features of the constructive implementation of individual nodes have been considered. The algorithm of the functioning of the laboratory installation was developed with the guidance of the developed methodology for calculating humidity, mass and volume flow of the generated working environment in accordance with the selected parameters of the installation. Mathematical modeling of the modes of operation of the laboratory installation was carried out and the limit modes of its functioning were established, which are determined by the maximum possible saturation of the output flow with water vapor. The influence of the humidity of the input flow on the humidity of the output flow was simulated, taking into account the generated gas flow rate and the generated mass flow rate of moisture. The technical characteristics of the developed laboratory installation were given, which ensure the reproduction of working air flows in the range from 0,016 to 5 m3/h, the generation of moisture in the range from 0,1∙10-5 to 1∙10-4 kg/s, which achieves the possibility of reproducing humidity output flows in the range from the real humidity of the environment until it reaches one hundred percent value of relative humidity. The developed installation allows physical modeling of the effect of moisture on the operation of indirect measurement flow sensors, primarily thermo-anemometric ones.
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