Hydrodynamic properties and green water loads of"CNOOC Guanlan"floating wind turbine
The motion properties,green water loads,and slamming loads of a semi-submersible floating wind turbine(FOWT)"CNOOC Guanlan"were studied experimentally and numerically considering strong waves and high wave steepness under typhoon conditions in the South China Sea.A new hydrodynamic analysis procedure for such extreme conditions was proposed based on phenomenon observation and load calculation.Main results in the study reveal that the first-order wave loads mainly influence the horizontal and vertical motion ranges,while the mean wind loads influence the maximum motion limits.For the green water phenomenon,unlike conventional offshore oil and gas platforms where the part on the head wave side typically faces higher impact,this FOWT's column on the back wave side exhibited a higher probability of green water hitting.Consequently,equipment should be avoided on the column deck on the back wave side.Moreover,the semi-submersible FOWT consists of small bars which tend to break waves,which leads to primarily white water hitting observed in model tests,with slamming loads within manageable levels.Locally strengthening the floating structure is advised to handle these loads effectively.A three-parameter wave elevation formula was developed to accurately simulate the green water phenomenon and guide platform design improvements.These findings provide basic reference for floating platform motion and design regarding green water in extreme conditions.
"CNOOC Guanlan"semi-submersible floating wind turbinemotion properties of the floating platformgreen watermodel testwave loadswind loads
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