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Experimental study of a small scale bi-directional axial impulse turbine for acoustic-to-mechanical power conversion

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  • Elhawary, M.A.
  • Ibrahim, Abdelmaged H.
  • Sabry, Ashraf S.
  • Abdel-Rahman, Ehab

Abstract

Axial impulse turbines have been utilized for oscillating water column wave-energy conversion because of their wide operating range without stalling point. Previous studies in the oscillating-flow environment gave no information on the performance of these turbines at high frequencies. This study extends the use of these turbines to conditions close to those encountered in thermoacoustic power generators, which require the turbine to operate at a large frequency in a closed duct. The use of bi-directional turbines as acoustic-to-mechanical power converters brings several advantages, such as their low acoustic impedance, in comparison with linear alternators, which facilitates integration with thermoacoustic engines. In the study, a variable-frequency test rig is set up using atmospheric air. Then, the performance of the bi-directional impulse turbine is studied at different rotor inlet/exit angle, rotor space-to-chord ratio, stator space-to-chord ratio, stator exit angle, and tip clearance. The dependence of the conversion efficiency on flow coefficient is reported over a set of constant input gas parcel velocities. The study also introduces an impedance segment to simulate the turbine on Delta-EC. The peak efficiency of the improved case is found to be 35.2% at a flow coefficient of 0.22, resulting an improvement of 38% over the reference case.

Suggested Citation

  • Elhawary, M.A. & Ibrahim, Abdelmaged H. & Sabry, Ashraf S. & Abdel-Rahman, Ehab, 2020. "Experimental study of a small scale bi-directional axial impulse turbine for acoustic-to-mechanical power conversion," Renewable Energy, Elsevier, vol. 159(C), pages 414-426.
    • Handle: RePEc:eee:renene:v:159:y:2020:i:c:p:414-426
    DOI: 10.1016/j.renene.2020.05.162
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    References listed on IDEAS

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    1. Yu, Zhibin & Jaworski, Artur J. & Backhaus, Scott, 2012. "Travelling-wave thermoacoustic electricity generator using an ultra-compliant alternator for utilization of low-grade thermal energy," Applied Energy, Elsevier, vol. 99(C), pages 135-145.
    2. Yongyao Luo & Alexandre Presas & Zhengwei Wang, 2019. "Numerical Analysis of the Influence of Design Parameters on the Efficiency of an OWC Axial Impulse Turbine for Wave Energy Conversion," Energies, MDPI, vol. 12(5), pages 1-12, March.
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    7. Setoguchi, T & Santhakumar, S & Maeda, H & Takao, M & Kaneko, K, 2001. "A review of impulse turbines for wave energy conversion," Renewable Energy, Elsevier, vol. 23(2), pages 261-292.
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