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Some effects of compressibility on small horizontal-axis wind turbines

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  • Wood, D.H.

Abstract

Many small wind turbines operate at high tip speed ratio and this gives rise to situations where compressibility may influence performance. The most important example is runaway, the operating point for an unloaded turbine where the rotational speed of the blades is maximised. Because compressibility significantly increases drag through the action of “shock-stall”, it may provide an inherent mechanism for overspeed protection. This possibility is tested computationally for a turbine with a high optimum tip speed ratio, having an aerofoil section (NACA 0012) whose behaviour in compressible flow is well known. Calculations of turbine performance for differing windspeeds, and hence Mach numbers, show that compressibility effects occur too slowly to prevent overspeeding. However, it is suggested that aerofoils could be designed to maximise the onset of shock stall.

Suggested Citation

  • Wood, D.H., 1997. "Some effects of compressibility on small horizontal-axis wind turbines," Renewable Energy, Elsevier, vol. 10(1), pages 11-17.
    • Handle: RePEc:eee:renene:v:10:y:1997:i:1:p:11-17
    DOI: 10.1016/0960-1481(96)00024-9
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    Cited by:

    1. Shafiqur Rehman & Md. Mahbub Alam & Luai M. Alhems & M. Mujahid Rafique, 2018. "Horizontal Axis Wind Turbine Blade Design Methodologies for Efficiency Enhancement—A Review," Energies, MDPI, vol. 11(3), pages 1-34, February.
    2. Pierella, Fabio & Krogstad, Per-Åge & Sætran, Lars, 2014. "Blind Test 2 calculations for two in-line model wind turbines where the downstream turbine operates at various rotational speeds," Renewable Energy, Elsevier, vol. 70(C), pages 62-77.
    3. Yan, Chi & Archer, Cristina L., 2018. "Assessing compressibility effects on the performance of large horizontal-axis wind turbines," Applied Energy, Elsevier, vol. 212(C), pages 33-45.

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