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Performance evaluation of modified hydrokinetic turbines in pipe flow with velocity correction technique

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  • Kumar, Rakesh
  • Sarkar, Shibayan

Abstract

This study compares the performance of two hydrokinetic turbines, the 3-blade spherical-shaped Savonius hydrokinetic turbine (SSHKT) and the Darrieus hydrokinetic turbine (SDHKT), under pipe flow conditions. Both numerical and experimental analyses were conducted to evaluate key performance parameters, including the coefficient of power (CP) and pressure drop across the turbines. Results indicate that the SDHKT achieved a higher maximum CP than the SSHKT, with increases of 16.335 %, 29.988 %, and 20.170 % at flow velocities of 1.0, 2.0, and 3.0 m/s, respectively. However, the increase in CP for SDHKT was inconsistent at higher velocities, attributed to upstream flow accumulation, flow instability, and blade separation effects. The operating range of Tip Speed Ratios (TSR) for SSHKT was 54.494 % narrower than for SDHKT, indicating a more limited operational range. The SSHKT experienced a higher pressure drop across the turbine compared to the SDHKT, while the SDHKT demonstrated quicker downstream pressure recovery due to its reduced blockage effect. The findings suggest that SSHKT, with its simpler design, could be an effective alternative to pressure relief valves in pipelines for pressure regulation, whereas SDHKT provides better power performance under varying flow conditions.

Suggested Citation

  • Kumar, Rakesh & Sarkar, Shibayan, 2025. "Performance evaluation of modified hydrokinetic turbines in pipe flow with velocity correction technique," Renewable Energy, Elsevier, vol. 242(C).
    • Handle: RePEc:eee:renene:v:242:y:2025:i:c:s0960148125001478
    DOI: 10.1016/j.renene.2025.122485
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    References listed on IDEAS

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