外文翻譯---基于內(nèi)流場(chǎng)的數(shù)值模擬的磁力驅(qū)動(dòng)泵在不同轉(zhuǎn)速下的性能研究-文庫(kù)吧
2025-05-16 15:42 本頁(yè)面
【正文】 imulation was feasible. In this paper, FLUENT is used to simulate the inner flow flied of magic drive pumps with different rotated speeds, and the velocity and pressure distributions of inner flow field and head are achieved. The pump efficiency is got by calculating the different power losses. Then magic drive pumps with different rotated speeds are tested, and the results show the method of simulation is feasible and provides instruction to design highspeed magic drive pump. and Structure The design parameters are listed on Table 1 and thestructure is shown in . of Inner Flow Field Control equations The fluid in magic drive pump is governed by physical conservation laws. It must meet mass conservation, momentum conversation and energy conservation. The flow in pump is supposed to be 3D, steady and inpressible. So continuity equation and NS equation, according to Boussinesq’s hypothesis, are expressed in Eq. (1): Turbulent model The standard k in simulation of plex 3D turbulent. The equations are expressed in Eq. (2) [17]: coefficients, and the values, got from Launder’s remended value and test result, respectively are , , , and . Models and grid generation Pro/Engineer was used to build 3D models of impeller and volute。 Gambit was used to mesh the models with triangle mesh. The grids were checked and output. The models are shown in Fig. 2 and the number of grids is listed on Table 2. Results and Analysis Fig. 3(a) shows that in the normalspeed magic drive pump, the absolute velocity of fluid in the impeller increases with the growth of channel radius。 the distribution of absolute velocity at the same circle is even。 absolute velocity reaches the maximum at the outlet of the impeller。 the absolute velocity of the fluid in the volute gradually decreases when fluid flows through the Ⅰ –Ⅸ sections, and it reaches minimum at outlet of the volute. Fig. 3(b) shows that in the highspeed magic drive pump, the absolute velocity of fluid in the impeller increases with the growth of channel radius。 the distribution of circumferential velocity bees uneven, which causes vortex。 the vortex makes the distribution of absolute velocity in the volute uneven。 the vortexes between Ⅰ and Ⅵ section in highspeed magic drive pump are lager than those innormalspeed magic drive pump. Fig. 4(a) shows that in normalspeed magic drive pump, the relative velocity of fluid in impeller increases with the growth of impeller radius and it reaches the maximum at the outlet of the impeller。 vortex appears at the end of the channel, which is quite intensive in volute tongue. Fig. 4(b) shows that in highspeed magic drive pump, the relative velocity of fluid in impeller increases with the growth of impeller radius。 the axial vortex appears in vicinity of the inlet of impeller and it extends to the volute. The difference of relative velocities on suction surface and pressure surface in the channel causes the axial vortex. The vortex in highspeed magic drive pump is more intensive than that in normalspeed magic drive pump, because the difference of relative velocities in highspeed magic drive pump is larger than that in normalspeed magic drive pump. Fig. 5(a) shows that in normalspeed magic drive pump, the total pressure of fluid increases with the increment of impeller radius。 it reaches the maximum at the outlet, and it keeps stabilizing after the fluid enters the volute. The distribution of total pressure in circumferential direction is even and the pressure on working face is slightly larger than that on back face. Fig.
畢業(yè)設(shè)計(jì)相關(guān)推薦
鄂ICP備17016276號(hào)-1