基于Fluent的海上风电大直径单桩腐蚀气体排放数值模拟

Numerical Simulation of Corrosion Gas Emission of Large-diameter Single Pile in Offshore Wind Power Based on Fluent

我国海上风机基础主要为大直径钢管桩,海洋地层中微生物腐烂导致钢管桩内出现腐蚀性有害气体,影响塔筒内电子元器件的使用寿命及工程人员的安全作业。本文以大连某海上风电大直径单桩基础为研究对象,提出一种桩身开孔的方法排除桩内腐蚀气体,并采用Fluent分析软件对开孔单桩进行流场数值模拟研究,得到如下结论:(1)钢管桩内气体在入口和出口位置均处在顺时针涡流场,气体可以从入口处向上流动并沿桩顶向出口流出,表明开孔措施可有效排除桩内上部区域气体;(2)距桩底50 m以下范围筒内气体流速缓慢,表明开孔措施可有效地防止底部气体进入上部塔筒;(3)桩身开孔位置与海平面的距离越近,开孔直径越大,出口处水平流速越大,排气效果越好。研究成果可为排除海上风电钢管桩内腐蚀性气体提供技术支持。

The foundation of China's offshore wind turbines is mainly large-diameter steel pipe piles,and the microbial rot in the marine formation leads to corrosive and harmful gases in the steel pipe piles,which affects the service life of electronic components in the tower and the safe operation of engineering personnel.Taking the large-diameter monopile foundation of an offshore wind turbine in Dalian as the research object,a method of drilling holes in the pile body is proposed to eliminate corrosive gas in the pile,and Fluent is used to conduct numerical simulation of the flow field of the perforated monopile,and the following conclusions are obtained:(1)The gas in the steel pipe pile is in a clockwise vortex field at both the inlet and outlet,and the gas can flow upward from the inlet and flow out along the top of the pile to the outlet.(2)The gas flow velocity in the cylinder 50 m below the bottom of pile is slow,indicating that the perforating measures can effectively prevent the bottom gas from entering the upper tower cylinder.(3)The closer the distance between the hole position and the sea level,the larger the hole diameter,the higher the horizontal velocity at the exit,and the better the exhaust effect.The research results can provide technical support for removing corrosive gases in offshore wind turbine steel pipe piles.