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| A study on the evolution of vortex in the draft tube of pump-turbine under the runaway condition |
| LI Qifei1,2,ZhAO Chao-ben1 ,LONG Shi-can1, QUAN Hui1,2 |
1. School of Energy and Power Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；
2. Key Laboratory of Fluid Machinery and Systems，Gansu Province，Lanzhou，Gansu 730050，China |
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Abstract To study the hydraulic instability of pump-turbine under runaway condition with different guide vane openings,the pump-turbine of a certain pumped storage power station was employed.Based on the Realizable k-ε turbulent model,the unsteady flow of the whole passage of the pump-turbine with seven different guide vane openings was calculated.The pressure fluctuation of the inlet of the volute,blade free section,the region between the runner and the roof,and draft tube was monitored to study the evolution of vortex shape and pressure fluctuation on the draft tube with the effects on different guide vane opening.Results show that when the guide vane opening is different under runaway condition,there is a distinct difference of the shape of the vortex.In the small guide vane opening,the vortex is obvious and the shape of the vortex changes constantly.With the increase of the guide vane opening,the shape of the vortex tends to the pattern of geometric cone from the disordered status,as well as the screw vortex rope presents the thicker tendency gradually.In the large guide vane opening,the higher velocity distribution near the vortex rope wall leads to the great loss of turbulent kinetic energy and other forms of energy near the straight cone region.Meanwhile,the key reason why great pressure fluctuation is caused in the draft tube is that the vortex is transported continuously towards the downstream.
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Received: 05 September 2017
Published: 15 February 2019
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