[논문]Preliminary experimental study on multi-stage gravitational water vortex turbine in a conical basin

Ullah, Rizwan; Cheema, Taqi Ahmad; Saleem, Abdul Samad; Ahmad, Sarvat Mushtaq; Chattha, Javed Ahmad; Park, Cheol Woo

doi:10.1016/j.renene.2019.07.128

[해외논문] Preliminary experimental study on multi-stage gravitational water vortex turbine in a conical basin

Renewable energy, v.145, 2020년, pp.2516 - 2529

Ullah, Rizwan (Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology) , Cheema, Taqi Ahmad (Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology) , Saleem, Abdul Samad (Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology) , Ahmad, Sarvat Mushtaq (Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology) , Chattha, Javed Ahmad (Faculty of Mechanical Engineering, GIK Institute of Engineering Sciences and Technology) , Park, Cheol Woo (School of Mechanical Engineering, Kyungpook National University)

Abstract ▼ AI-Helper

Abstract Gravitational water vortex turbine (GWVT) is an ultra-low head turbine that extracts energy from an artificially induced gravitational water vortex in the basin of cylindrical or conical configuration. The latter type of basin helps in the re-construction of vortex once it is distorted after passing through a runner and thus, provide an additional potential for power extraction at different heights along the basin. In the absence of a detailed experimental study on multi-staging of GWVT in a conical basin, a preliminary investigation has been carried out using runners of Savonius type blades and producing power independently because of telescopic shafts arrangement. The effects of crucial design parameters such as rotor diameter to basin diameter ratio (RB), vortex-blade interaction, the position of the various stages and the offset distance between the neighboring stages, on the performance of GWVT are reported. In addition, the performance parameters which include rotational speed, torque and power are investigated under various rotor submergence conditions; thus, revealing maximum performance for a brimming vortex-blade interaction. One of the key findings of the study is the complex transfer of energy between the two neighboring stages through the vortex flow without the physical contact of rotors. Moreover, multi-staging provides more power than single-stage GWVT by strengthening the vortex in the vicinity of each other through rigid body rotation of the neighboring runners. The outcomes of the present study make it a potential benchmark for the future generations of GWVT technology. Highlights Energy transfer between the neighboring stages is improved through the water vortex. Performance of multi-stage GWVT depends on rotor diameter to basin diameter ratio. A brimming vortex-blade interaction compels the rotors to improve their performance. Addition of rigid body rotation to the vortex improves power of neighboring stages. With more energy in the surface cortex, top stage performs better than bottom stage.

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[해외논문] Preliminary experimental study on multi-stage gravitational water vortex turbine in a conical basin

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