TY - JOUR
TI - Assessment Method for Sound Radiated by Cyclically Operating Wells Turbines
AU - Starzmann, R
AU - Moisel, C
AU - Carolus, T
AU - Tease, K
AU - Arlitt, R
T2 - International Journal of Marine Energy
AB - The oscillating water column (OWC) is a system for sea wave energy conversion. This paper deals with the axial Wells turbine. Main objectives of this study are the experimental determination of aerodynamic and aero-acoustic characteristics of a laboratory scale turbine and their subsequent usage for full scale turbine performance prediction.For that a model Wells turbine was built and tested on a laboratory test rig at the University of Siegen. Assuming that the steady-state characteristics hold in unsteady operation, mean quantities such as a mean efficiency and an equivalent sound power level are defined that allow the quantification of the overall performance during cyclic operation. The steady-state quantities are used to assess various control strategies and to predict the aero-acoustic performance of the full scale LIMPET turbine on Islay, Scotland.In general, scaled-up acoustic laboratory test rig data correlates well with measurements from the full scale LIMPET turbine. A theoretical assessment of different control strategies under regular wave conditions demonstrates the potential of a variable speed control for reduction of equivalent sound power. Turbine operation which admits stall yields a typical signature in the equivalent sound power spectrum: a stalled Wells turbine emits low frequency noise at a level far above all levels encountered in the unstalled flow regime and hence significantly contributes to the equivalent sound power.Acknowledgement: This article was identified by the Crown Estate Wave and Tidal Knowledge Network
DA - 2013/06//
PY - 2013
VL - 2
SP - 12
EP - 27
UR - https://www.sciencedirect.com/science/article/pii/S2214166913000052
DO - 10.1016/j.ijome.2013.05.004
LA - English
KW - Marine Energy
KW - Wave
KW - Noise
ER -