串列海缆悬跨段的流场特性及防护措施研究

Study on Flow Field Characteristics and Protective Measures of Suspended Span Section of Tandem Submarine Cable

随着海上风电场的建设,海底电缆冲刷悬跨问题逐渐显现,对风电场的安全运营造成威胁。以如东海上风电场项目为例,建立数值模型分析了单向流作用下串列海缆悬跨段的尾流特性。研究结果表明,串列海缆圆柱之间存在负压区,该区域内流速较大,产生周期性的漩涡脱落,使得海缆后柱产生周期性作用力。为避免海缆在周期性力作用下的破坏,结合实际海况,提出采用柔性材料和压载管道方法进行海缆冲刷防护,所得结果可为相关海上风电场工程提供参考。

With the development of offshore wind farm construction,the problem of submarine cable scouring and suspension is gradually emerging,which poses a threat to the safe operation of wind farm.Based on the East China Sea wind farm project,a numerical model is established to analyze the wake characteristics of the suspended span of tandem submarine cables under unidirectional flow.The results show that there is a negative pressure zone between the series submarine cable columns,in which the velocity is large,resulting in periodic vortex shedding,yielding a periodic force on the rear column of submarine cable.In order to avoid the damage of submarine cable under the periodic force,combined with the actual sea conditions,a method of flexible material and ballast pipeline is proposed for submarine cable scouring protection.The results can provide some references for relevant offshore wind farm projects.