科研之友
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摘要
The steady, three-dimensional and turbulent flows in the impeller without volute and in an experimental centrifugal pump are investigated numerically with CFD. The fluid viscosities are I (water) and 48mm(2)/s (oil), and the roughness is 100 pm. The difference of the flow in the impeller without volute from that in the impeller with volute is clarified and the reason for the presence of a peak in the impeller theoretical head curve is identified. Furthermore, the computational flow fields are compared with that measured by using LDV. It is demonstrated that that the flow is axisymmetrical in the impeller without volute, but it isn't in the impeller with volute. The large "dead water" area in the individual passage of impeller contributes to the emergence of a peak in the impeller theoretical head curve and the increase in slip factor at low flow rate. The CFD results of the flow in the impeller and volute generally resemble that measured by means of LDV, however, some detail of the CFD results differs from that of the LDV measurements.
- 出版日期2008
- 单位兰州理工大学
