Experimental research on local scour of large-diameter winged monopoles for offshore wind turbines under wave-current interaction
With the increasing scale of offshore wind turbines and the water depth of wind farms,the foundations of offshore wind turbines need to endure greater horizontal loads and bending moment loads.Winged monopiles can effectively enhance the load-bearing capacity of wind turbine foundations,however,the impact of the wing structure on local scour around the pile foundation is currently unclear.Experiments of large-diameter winged monopile dynamic bed scour under the combined action of pure currents and wave-currents were conducted in a wave-current flume to study the scour characteristics of winged monopiles.The experimental results demonstrate that the local scour characteristics around the winged monopiles are significantly influenced by the incoming flow intensity,direction,and type.When the flow intensity is low,the winged monopile compared to the traditional monopile foundation offers better scour protection,with a maximum efficiency of up to 20.7%.However,under high flow intensity or the superimposed situation of wave-current,the protective effect of the winged monopile may disappear or even lead to more severe scour.The range of the scour hole is affected by the angle between the winged monopile and the flow direction,with the maximum width of the scour hole of the winged monopile reaching more than twice that of the monopile.In practical engineering applications,in order to fully leverage the load-bearing capacity of the winged monopile,the effect of local scour should be carefully considered.It is recommended to install the wings below the position of the maximum scour depth on the pile body to achieve better load-bearing capacity enhancement.
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