极端风况下漂浮式风力机尾流数值模拟OA

Given the complex nonlinear characteristics of the wake effect of floating wind turbines,the sudden change in wake velocity induced by extreme wind conditions can significantly exacerbate this phenomenon.Based on the FAST.Farm platform,a novel three-turbine system(two 15 MW and one 5 MW floating turbines)was constructed.By adjusting the flow direction spacing(2D and 6D,D is is the diameter of the impeller)between the small turbines and the large turbines,the focus was placed on exploring the wake evolution under four typical operating conditions:extreme operating gust(EOG),extreme direction change(EDC),extreme horizontal wind shear(EWSH),and extreme vertical wind shear(EWSV).The research results show that when the flow direction spacing increases from 2D to 6D,the influence area of the small turbines on the wake of the downstream 15 MW turbine moves downwards,and the turbulence intensity at the hub center decreases by 10%.Under EOG conditions,the overall power of the system increases by 13%,but the turbulence intensity increases by 20%.Under EDC conditions,the wake effect weakens,and the influence of flow direction spacing on power decreases.Under extreme wind shear(EWS)conditions,there is a severe asymmetric distribution of the wake.The power impact under EWSH conditions is significantly stronger than that under EWSV conditions.Under EWSV conditions,the shear effect of the wake is intensified,and the turbulence intensity fluctuates greatly.Its load monitoring should be strengthened.