Numerical Simulation Of The Internal Flow In The Water Meter And Turbine Flowmeter

Water meter and turbine flowmeter are the traditional flow measurement instruments, and they are widely used in modern production and livelihood. Recently, with the increasing shortage of water and natural gas resources, the flowmeter used to measure water and natural gas need to possess the characteristic of low loss and high accuracy. For water meter and turbine flowmeter, it is very important to promote their quality.In this paper, the WS-80vertical Woltmann water meter, CNiM-TM-100-G400and CNiM-TM-80-G160gas turbine flowmeter have been investigated. The internal flow, pressure loss and relationship between flow rate and impeller’s rotational speed have been deeply studied by using Computational Fluid Dynamics (CFD) methods. The results are helpful to the optimization of the design of flowmeters. The main research work is as follows:(1) The simplified three-dimensional WS-80vertical Woltmann water meter’s model was established. The Fluent was used to get the internal flow of water meter. Then the pressure loss was compared with experimental data to verify the numerical simulation.(2) The press loss induced by bottom fluid director, which can be used to evaluate its influence to the pressure loss of the water meter, has been studied separately.(3) The complete three-dimensional WS-80vertical Woltmann water meter’s model was established, and Fluent was used to get the detailed information of inner flow field of water meter. Then the pressure loss was compared with simplified model data and experimental data to verify the numerical simulation.(4) The three-dimensional CNiM-TM-100-G400and CNiM-TM-80-G160gas turbine flowmeter’s models were established. The Fluent was used to get the internal flow of turbine flowmeter. Then the pressure loss was compared with experimental data to verify the numerical simulation. (5) The user-defined function (UDF) and the dynamic mesh of Fluent were used to calculate the impeller’s rotational speed under given flow rate, which were compared with experimental data to verify the numerical simulation.(6) PumpLinx was used to study the relationship between flow rate and impeller’s rotational speed. Then the calculation results were compared with experimental data to verify the numerical simulation.