Performance analysis of multi-stage gravitational water vortex turbine

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

In this study, the performance of a multi-stage gravitational water vortex turbine (GWVT), which is assembled in a conical basin, is investigated analytically and experimentally. Each runner of the multi-stage GWVT is independent in terms of power generation through telescopic shaft arrangement. Performance parameters, such as rotational speed, torque, power and efficiency, are analyzed under various load conditions in which the effects of design parameters, such as rotors ratio, offset distance between neighbouring runners, and intra-staging and inter-staging of two-stage and three-stage GWVT, are considered. In the multi-stage GWVT, the profile of the blades of upstream runners result in minimal vortex distortion. Thus, the power generation capacity of downstream runners are ultimately enhanced because the performance of latter runners strongly depend on the head utilization capacity of the former runner. Furthermore, the runners with blades tilted on a vertical plane are best suited for the position near the bottom of the basin, whereas cross-flow blades are recommended at the top position. Moreover, the present study suggests that the rotors ratio of the neighbouring runners be selected in such a way that the two runners have the same rotor-to-basin diameter ratio with optimum offset distance. Multi-staging in GWVT demonstrates the development of a combined effect of solid body rotation and free vortex. It also shows a prominent improvement in the overall performance of the turbine compared with that of single-stage GWVT. The proposed mathematical model successfully predicts the experimental results qualitatively and quantitatively, thereby proving its reliability and robustness.

Original languageEnglish
Article number111788
JournalEnergy Conversion and Management
Volume198
DOIs
StatePublished - 15 Oct 2019
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2019

Keywords

  • Freewheeling
  • Inter-staging
  • Intra-staging
  • Multi-staging
  • Offset distance
  • Rotors ratio

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Nuclear Energy and Engineering
  • Fuel Technology
  • Energy Engineering and Power Technology

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