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| Numerical study on unstable head-discharge performance in pump-turbine considering the transient rotor-stator interactions |
| Received:August 27, 2013 Revised:November 25, 2013 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201406014 |
| KeyWord:pump-turbine CFD simulation unstable head-discharge rotor-stator interaction |
| Author | Institution |
| 肖若富 |
中国农业大学 水利与土木工程学院, 北京 |
| 陶然 |
中国农业大学 水利与土木工程学院, 北京 |
| 刘伟超 |
东方电机有限公司研试中心, 德阳 |
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| Abstract: |
| The unstable head-discharge characteristic affects the stability and security of pump-turbine.In pump mode,the unstable phenomenon may occur when the pump-turbine is starting,shutting down or running at the maximum head condition.To investigate this phenomenon,numerical simulation with SST k-ω turbulence model was conducted.Both steady and transient analysis type were used to forecast the head-discharge characteristic.The whole flow passage was modeled with the adjustable vane opening angle of 20 degrees.The Transient Rotor Stator (TRS) model which considering the transient interaction was set respectively at the "draft tube-runner" and "runner-adjustable vane" interfaces.In this study,head-discharge curves were plotted and the head losses in the flow passages were calculated to reveal the mechanism of the unstable head variation.Results show that the unstable head-discharge performance is related to the vortex structure and accompanying loss.Compared with steady analysis,the result of transient analysis is more coincident with experimental data and has a more realistic flow field variation in front and behind the rotor-stator interfaces.The transient analysis with considering rotor-stator interactions is more suitable for pump-turbine and other turbo-machinery especially under off-design conditions.So,this study will provide more valid guidance to improve the operating stability of pump-turbines. |