1、PDF外文：http:/ Performance Study Based on Inner Flow Field Numerical Simulation of Magnetic Drive Pumps with Different Rotate Speeds Abstract: Magnetic drive pump has gotten great achievement and has been widely used in some special fields. Currently, the researcheson magnetic drive pump have fo
2、cused on hydraulic design, bearing, axial force in China, and a new magnetic drive pump with low flowand high head have been developed overseas. However, low efficiency and large size are the common disadvantages for the magneticdrive pump. In order to study the performance of high-speed magnetic dr
3、ive pump, FLUENT was used to simulate the inner flow fieldof magnetic drive pumps with different rotate speeds, and get velocity and pressure distributions of inner flow field. According toanalysis the changes of velocity and pressure to ensure the stable operation of pump and avoid cavitation. Base
4、d on the analysis ofvelocity and pressure, this paper presents the pump efficiency of magnetic drive pumps with different rotated speeds by calculating thepower loss in impeller and volute, hydraulic loss, volumetric loss, mechanical loss and discussing the different reasons of power lossbetween the
5、 magnetic drive pumps with different rotated speeds. In addition, the magnetic drive pumps were tested in a closed testingsystem. Pressure sensors were set in inlet and outlet of magnetic drive pumps to get the pressure and the head。 The results of simulation and test were similar,which shows
6、that the method of simulation is feasible. The proposed research provides the instruction to design high-speed magneticdrive pump. Key words: magnetic drive pump, simulation, power loss, pump efficiency. 1.Introduction Magnetic drive pumps are currently used in petrol andchemical industries to
7、 pump toxic, explosive, corrosive andexpensive fluid. High-speed magnetic drive pump will havean extensive prospect with the application of frequencyconversion technology and the requirement ofenvironmental protection. Currently, studies on the design of magnetic drive pump,bearing, axial force and
8、magnetic coupling have been goingon for several years, and some achievements have been got.Jiangsu University developed the magnetic drive pump withhigh power, which provided the design method of magneticdrive pump. Kong Fnayu developed a new bearing materialFC5045, which is well in wearable perform
9、ance and a newway to balance the axial force by usingcooling cycle fluidwhich almost eliminate axial force6. Refs. 711 useANSYS to simulate the efficiency of magnetic coupling,which improves the efficiency of magnetic drive pump.RIKKE, et al12, researched into the distribution of flowfield by using
10、large eddy simulation to simulate the innerflow field in impeller under different operating conditions.KITANO13 investigated into the distributions of pressureand velocity when impeller and pumping chamber were indifferent relative positions by simulating the unsteady flowin centrifugal pump. BENRA1
11、4 proved that the method ofsimulation was feasible by simulating velocity distribution insingle-impeller centrifugal pump and comparing simulationwith testing result of PIV. Many researchers have researchedand analyzed inner flow field in the pump by usingcomputational fluid dynamics(CFD). In order
12、to do furtherresearch on the performance of magnetic drive pump, thispaper presents the simulation of 3D turbulent model inside ofmagnetic drive pumps with different rotated speeds. Thedistributions of pressure and velocity in impeller and volutewere got； head efficiency and power losses in normal-s
13、peedand high-speed magnetic drive pumps were discussed. Thecomparison of simulation with experiment showed that themethod of simulation was feasible. In this paper, FLUENT is used to simulate the inner flowflied of magnetic drive pumps with different rotated speeds,and the velocity and pressur
14、e distributions of inner flowfield and head are achieved. The pump efficiency is got bycalculating the different power losses. Then magnetic drivepumps with different rotated speeds are tested, and theresults show the method of simulation is feasible andprovides instruction to design high-speed magn
15、etic drivepump. 2.Parameters and Structure The design parameters are listed on Table 1 and thestructure is shown in Fig.1. 3.Simulation of Inner Flow Field 3.1 Control equations The fluid in magnetic drive pump is governed byphysical conservation laws. It must meet mass conservation,momentum conversation and energy conservation. Theflow in pump is supposed to be 3D, steady andincompressible. So continuity equation and N-S equation,according to Boussinesqs hypothesis, are expressed inEq. (1):
