Observed Acoustic and Aeroeleastic Spectral Responses of a MOD-2 Turbine Blade to Turbulence Excitation

    Research output: NRELTechnical Report

    Abstract

    Early results from a recent experiment designed to directly evaluate the aeroacoustic/elastic spectral responses of a MOD-2 turbine blade to turbulenceinduced unsteady blade loads are discussed. The experimental procedure consisted of flying a hot-film anemometer from a tethered balloon in the turbine inflow and simultaneously measuring the fluctuating airload and aeroelastic response at twoblade span stations (65% and 87% spans) using surface-mounted, subminiature pressure transducers and standard strain gage instrumentation. The radiated acoustic pressure field was measured with a triad of very-low-frequency microphones placed at ground level, 1. 5 rotor diameters upwind of the disk. Initial transfer function estimates for acoustic radiation, blade normal forces, flapwiseacceleration/displacement, and chord/flapwise moments are presented.
    Original languageAmerican English
    Number of pages9
    StatePublished - 1984

    NREL Publication Number

    • NREL/TP-214-2374

    Keywords

    • MOD-2 turbine blade
    • spectral responses
    • wind

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