Multi-row extension to laterally confined actuator disk model using a hybrid inviscid-viscous approach

Conference item

The effects of blockage and wake mixing are fundamental but still unresolved problems in the aero/hydrodynamics of wind/tidal-stream turbine arrays. This paper aims to extend the linear momentum actuator disc theory (LMADT) to incorporate a large number of aligned or staggered turbine rows with inter-turbine wake mixing. The extension is performed by utilising alternating inviscid and viscous zones to calculate the flow around a turbine and to calculate mixing in the wake, respectively. Using the extended model this study explores the power extraction of a multi-row turbine array for a varying resistance coefficient. This exploration is performed for both aligned and staggered turbine arrangements for a range of blockage ratios and wake mixing rates. Results highlight the importance of the combined effects of blockage and wake mixing, particularly for staggered turbine arrays. The impact of the number of turbine rows and inter-turbine mixing rates on the maximum array performance is also investigated.

Authors: Juniper, MCR; Nishino, T

• Publication status: Published
• Peer review status: Reviewed (other)
• Publisher: European Academy of Wind Energy
• Acceptance date: 2020-12-01
• Event title: 16th EAWE PhD Seminar on Wind Energy
• Language: English
• Keywords: FFR