锥角对锥体结构抗冰性能影响的离散元分析

Influence of cone angle on anti-icing performance of conical structure with numerical simulations of discrete element method

在寒区海洋工程中,锥体海洋结构的尺寸参数对其破冰性能具有重要影响。采用具有黏结-破碎功能的离散元方法模拟海冰与锥体结构的相互作用过程中海冰的破坏模式及冰载荷分析。该离散元方法的计算参数通过与渤海油气平台的实测数据对比进行了可靠性验证。在此基础上,当设计海域的潮差固定时,对不同锥角下风电单桩锥体结构的冰载荷和海冰破坏模式进行了离散元分析。计算结果表明:锥体冰载荷随锥角的增大而增大,海冰的平均断裂长度则随锥角的增大而减小;当锥角小于70°时海冰的破碎模式主要为弯曲破坏,而当锥角大于70°时海冰破坏模式则主要为挤压破碎。以上研究结果可为冰区海上风电单桩结构的抗冰锥设计提供参考。

In cold ocean regions,the geometric parameters of ice-breaking cone affect the anti-icing performance of the offshore structures.In this study,the discrete element method(DEM)with bond-break function is adopted to simulate the failure modes of ice and ice forces during the interaction between sea ice and conical offshore structures.The computational parameters in DEM are verified with the field measured data on the offshore platforms in the Bohai Sea.Based on this study,the DEM model is adopted to simulate the ice loads and failure of ice cover on the single conical pile under the condition of fixed tidal height.The simulated results show that the ice load increases with increasing the angle of ice-breaking cone.The failure mode of ice cover is in mainly crushing failure if the cone angle is less than70°,and is in bending failure if the cone angle is more than70°.This study can provide references for the installation of anti-icing cone on the single pile structure of offshore wind turbines.