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• W4200419335 endingPage "095765092110527" @default.
• W4200419335 startingPage "095765092110527" @default.
• W4200419335 abstract "Renewable energy is strongly recommended to replace the traditional fossil fuels to solve the severe environmental pollution. However, small hydro-turbine performs lower efficiency, and it is also easy to be blocked and impacted. Therefore, the contra-rotating rotors are adopted to overcome the disadvantages of small hydro-turbine. The performance and internal flow condition of contra-rotating small hydro-turbine have been clarified. In this paper, a new transparent casing is manufactured, and pressure fluctuation experiments are conducted. The pressure fluctuation experiments are to clarify the pressure fluctuation during the running of contra-rotating small hydro-turbine. Then the hydraulic stability of contra-rotating small hydro-turbine can be further investigated. According to the experiment results, for the new model, most of the amplitudes of pressure fluctuation are decreased. The maximum decreasing percentage of peak-to-peak value is 74.22%, and it is appeared on the point of Pr3. On frequency domain, the dominant frequencies of pressure fluctuation are rotation frequency and blade passing frequency. The investigation to tip leakage flow of contra-rotating small hydro-turbine is conducted based on the pressure fluctuation experiment and numerical simulation. The tip leakage vortex is identified by Q-criterion. The pressure distributions in tip clearance area show that the tip leakage vortex of new model is suppressed, and this helps to reduce the amplitude of pressure fluctuation in tip clearance area." @default.
• W4200419335 created "2021-12-31" @default.
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• W4200419335 date "2021-12-06" @default.
• W4200419335 modified "2023-09-27" @default.
• W4200419335 title "Pressure fluctuation on casing wall and investigation to tip leakage flow of contra-rotating small hydro-turbine" @default.
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• W4200419335 doi "https://doi.org/10.1177/09576509211052734" @default.
• W4200419335 hasPublicationYear "2021" @default.
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