| Cite this article: | 渠浩,汤方平.立式轴流泵装置进口导水锥支架对马鞍区性能影响研究[J].灌溉排水学报,0,():-. |
| quhao,tangfangping.立式轴流泵装置进口导水锥支架对马鞍区性能影响研究[J].灌溉排水学报,0,():-. |
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| Study on the Influence of Inlet Water Guide Cone Support of Vertical Axial Flow Pump device on the Performance of Saddle Zone |
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quhao, tangfangping
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Yangzhou University
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| Abstract: |
| Abstract:【Objective】to study the influence of impeller guide cone support on the hydraulic performance and internal flow field of vertical axial flow pump under "saddle zone " and design flow conditions.【Method】Based on RANS equation and SST K-ω turbulence model, three-dimensional calculation was carried out, and a vertical axial-flow pump was selected to compare and analyze the schemes with and without guide cone support, and the reliability of numerical calculation was verified by model test.【Result】Under the condition of small flow rate, there is backflow at the outlet of the inlet passage of the vertical axial flow pump without inlet guide cone support, which forms a large range of backflow vortex, causes the blockage of the inlet passage, causes a large number of low-frequency pressure pulsation, and produces energy loss, resulting in a sudden drop in head and saddle area. The scheme of inlet guide cone support can effectively restrain the scope and strength of reflux vortex, reduce the low frequency pressure pulsation and improve the stability of pump device. The lift at the lowest point of saddle zone increased by 5.5%, and the saddle shape was obviously eliminated. Under the design flow condition, the installation of the inlet guide cone bracket increases the blade work capacity, offsets part of the hydraulic loss of the bracket, makes the head drop smaller, about 1.3%, and the internal flow field is more uniform.【Conclusion】the imported guide cone support has great potential to improve the saddle zone of vertical axial flow pump in engineering application. |
| Key words: saddle zone; vertical axial pump device; numerical simulation; model test |
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