Gas turbine meter scale flow pressure

Abstract: the gas turbine meter scale information flow pressure produced by excellent flow meter, flow meter manufacturer to offer you the quotation. 1 turbine flowmeter is adopted in this paper the basic structure and working principle of cangnan instrument and meter plant CNiM - TM series 80 mm gas turbine flow meter as the research object, carries on the numerical simulation of internal flow pressure loss. Gas turbine flowmeter structure diagram as shown in figure. More flow meter manufacturers choose model price quote you are welcome to inquire, here is a gas turbine meter scale flow pressure article details. 1 turbine flowmeter is adopted in this paper the basic structure and working principle of cangnan instrument and meter plant CNiM - TM series 80 mm gas turbine flow meter as the research object, carries on the numerical simulation of internal flow pressure loss. Gas turbine flowmeter structure diagram as shown in figure 1. Gas turbine flowmeter physical as shown in figure 2, figure 2 ( 一) For the turbine flowmeter physical figure, figure 2 ( b） For the turbine flowmeter physical movement impeller figure. Figure 1 gas turbine flowmeter tutu 2 turbine flowmeter and the impeller structure figure of gas turbine flowmeter physical principle is that the gas flows through the flow meter turbine blade rotation, use in the fluid in the impeller rotating angular velocity, and is proportional to the fluid flow, the relationship between fluid flow velocity is obtained by measuring the impeller speed, thus get the pipe flow value. Turbine flowmeter of the output pulse frequency is proportional to the measured volume flow rate qv f, namely, 1) Type ( 1) In: k— The instrument coefficient of flow meter. Can write according to the law of motion of the impeller of the equation of motion for ( 2) Type ( 2) In: J— The rotational inertia of the impeller; t— Time; ω — The speed of the impeller; Tr— Driving torque; Trm— Mechanical friction torque; Trf— Flow resistance moment; Tre— Electromagnetic torque. Calculation model 2. 1 set the mathematical model of numerical simulation of turbine flowmeter for air as the working medium, flow in turbulent flow, the numerical simulation of turbulence model the Realizable K - & epsilon; Model which is suitable for the simulation of rotating flow, strong adverse pressure gradient flow boundary layer, flow separation and secondary flow, the model equation is expressed as: & ndash; — To the average flow velocity; a— The speed of sound. μ — Dynamic viscosity coefficient; υ — Kinematic viscosity coefficient; K— The turbulent kinetic energy; ε — Turbulent dissipation rate; β T— Expansion coefficient; ω k— The angular velocity. — When the rotation rate tensor; If you don't consider the buoyancy influence Gb = 0, such as the incompressible flow, = 0, YM = 0. 2. 2 fluid field meshing use Solidworks 3 d design software, according to the physical size of turbine flowmeter modeling and assembly of different parts, simplifying the spindle, bore pressure and gas such as smaller portions of influence on the fluid field. Boolean operation to movement first part do get pure fluid field, then on impeller plus envelopment form the area, in the stopwatch import and export both before and after plus 15 times the diameter of straight pipe, to ensure the flow of import and export for fully developed turbulent flow. All straight pipe, the impeller envelope before and after fluid field including body and part of the movement fluid field. Meshing with Gambit software for 3 d model, on the small side of fluid field and the difficult to generate the grid components such as the Angle is optimized and simplified handling, fluid field using unstructured hybrid grid, and the machine core flow within the impeller flow situation more complex regions such as partial encryption, as shown in figure 3. Figure 3 ( 一) For body movement flow region grid graph, figure 3, b） For the impeller grid, and the overall grid total number about 2. 3 million. Figure 3 turbine flowmeter fluid field grid in figure 2. 3 set numerical calculation, numerical simulation conditions for the convenience of simulation results with the experimental results of contrast, environment temperature, humidity and pressure setting and the experiment condition, the same air flow media choice, the density of air & rho; And dynamic viscosity & eta;

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