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ANSYS CFD function of the centrifugal pump design

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3 Example calculation of the main structural parameters of 3.1 impeller design parameters were: head H = 30m; flow rate Q: 0.085m3 / s; speed: 1450r/min; expected efficiency of 77 : 0.84. The viscosity of water is 0. O01kg / (m ・ s), density 1000kg/m3. Assuming the hydraulic design has been designed by the impeller, the structure parameters are: inlet diameter D】 = 160mm,[link widoczny dla zalogowanych], outlet diameter D2: 320mm, width b import】 = 50mm, outlet width b2 = 28mm, leaf number z = 6 tablets, blade wrap angle 100 ~. 3.2 The finite element mesh impeller impeller by the finite element mesh of the steps: The pump is not easy to achieve due to the current model of the parts joined together at the same time a whole, it is generally used in various parts of were calculated in the manner discussed here only the calculation of the impeller. Using ANSYS software FLOTRANCFD function calculations show that the impeller flow with the pressure difference Q6 (P6: Pb2 a Pb1,[link widoczny dla zalogowanych], P61 to enter I: 1 pressure, P62 is the I: 1 pressure) decreases, which the actual match. Given a number of the pressure difference, and inlet velocity (,,), reasonable given impeller can be calculated flow velocity and pressure distribution. Thus the flow can be calculated accordingly obtained the relationship between pressure and flow Q6 curve shown in Figure 2. Also calculate the flow corresponding to the I: 1 the average relative velocity of each component (2, Wz2) (see Table 1), combined with the speed of the impeller implicated in the export of (U2 = / '209, the impeller angular velocity, r for the impeller exit radius) can calculate the absolute speed of each component (2), calculated for the performance of the impeller and follow-up components calculated. 3 + 2 = amount of tear sheets ● turn a screw 33, 2005 Volume of fluid machinery 51fMPa1 l2 Figure 2 the pressure drop and flow impeller q6 of Impeller flow curve in Table 1 and the exit velocity 2Wr22 (kPa) (m3 / s ) (m) (m / s) (m / s) (m / s) 1800.058845.090.144.64-4.441600.071442.760.135.47-5.091300.084 | 639.980 .136.42-5.84950.37.480.147.29-6.5 O7 calculated results using the above formula (9), calculate the flow q and the calculation of the impeller lift curve shown in Figure 3. Reference to the distribution of pressure and flow rate, inspection of impeller design is reasonable, in order to improve the impeller. Hb = (co / g) (22 a 11) (9) where, Vu2 - impeller into and out of El circumferential tangential velocity component, m/sr-- impeller inlet radius, mi Figure 3 impeller flow q and the calculated head The curve of pressure distribution and velocity distribution of 3.4 of a condition the pressure and velocity distribution as shown in Figure 4,[link widoczny dla zalogowanych],5. (A) impeller face pressure distribution (b) pressure distribution on the impeller on the back to indicate the pressure distribution in Figure 4 (a) leaves the flow between the flow channel 4 Conclusion (b) flow channel between the blades exit velocity distribution of velocity distribution in Figure 5 indicate use of ANSYS finite element CFD analysis software functionality can be achieved within the three-dimensional flow calculations of the pump can pump more accurately calculate the internal flows, reveal the pressure and velocity flow field distribution and predict the performance of the pump, to provide a reliable basis for improving the design. According to the results of pressure distribution, it is easy to further calculate the axial thrust similar to that of force,[link widoczny dla zalogowanych], and for other aspects of pump mechanics. This article describes the method for calculating the pump's overall analysis of the mechanical foundation, but this method still has some of the approximation requires further research to improve References: [1] mixed free Yulin. Pump [M]. Beijing: Mechanical Industry Press, 2003. [2] Sun Jianghong, large section high. Pro/ENGINEER2000i applications and advanced features of the secondary development [M]. Beijing: Tsinghua University Press, 2002. [3] Tao, Yang Fengpeng. Proficient in ANSYS [M]. Beijing: Tsinghua University Press, 2002. Author: Shi Xiang Zhong (1963.), Male, associate professor, Ph.D.,[link widoczny dla zalogowanych], is mainly engaged in hydro-mechanical computer-aided design, numerical simulation of internal flow and performance simulation and other research, mailing address: 056 021 South Street, Handan City, Hebei Engineering 62 Institute of Hydropower Institute. Hu Lin 087 ● 59 feet like 0nnnn00-00

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