海上风力机波浪载荷计算

发布时间：2018-07-01 12:00

本文选题：多相流 + 非定常　；参考：《南京航空航天大学》2017年硕士论文

【摘要】：海上风资源相对于陆上具有较为明显的优势,其通常具有更高的年平均风速、更低的湍流度以及更小的风剪切效应,但海上复杂波浪和洋流等对支撑结构产生的非定常水动载荷对机组的动态性能将产生明显的影响。考虑海上风力机波浪载荷计算的复杂性,以单桩式支撑结构为研究对象,分别采用数值水池方法和莫里森方法计算了支撑结构受到的波浪载荷。首先采用Morison方法计算海上支撑结构的波浪载荷,基于波浪频谱和线性叠加法可以有效的模拟海浪,通过相应波浪理论的分析同时使用Morison方程即可求得波浪载荷。数值水池主要基于Fluent软件进行构建。在Fluent中运用VOF模型捕捉波浪运动的自由表面,使用UDF模块及动网格技术实现造波和消波的过程,通过不可压非定常求解器实现数值水池的构建,最后利用三维数值水池计算海上风力机支撑结构的波浪载荷。两种方法的结果对比分析表明,Morison方法在海上风力机单桩支撑结构波浪载荷计算时具有较好的精度且计算效率较高,而多相流方法能够给出更为详细的流场信息和波浪情况,在对复杂形式的支撑结构计算时能够给出更好的计算精度。
[Abstract]:The offshore wind resource has obvious advantages over the land, and it usually has higher annual average wind speed, lower turbulence and smaller wind shear effect. However, the unsteady hydrodynamic loads generated by complex waves and ocean currents on the support structure will have a significant impact on the dynamic performance of the unit. Considering the complexity of wave load calculation of offshore wind turbine, the wave loads of supporting structure are calculated by numerical pool method and Morrison method respectively. First, the wave loads of offshore supporting structures are calculated by using Morison method. Based on wave spectrum and linear superposition method, the wave loads can be effectively simulated by using Morison equation simultaneously through the analysis of the corresponding wave theory. The numerical pool is based on fluent software. In fluent, VOF model is used to capture the free surface of wave motion, UDF module and moving grid technology are used to realize the process of wave generation and wave elimination, and the incompressible unsteady solver is used to realize the construction of numerical pool. Finally, the wave loads of offshore wind turbine supporting structure are calculated by using three-dimensional numerical pool. The comparison and analysis of the results of the two methods show that the Morison method has good accuracy and high efficiency in wave load calculation of offshore wind turbine single pile supporting structure, while the multiphase flow method can give more detailed flow field information and wave conditions. Better calculation accuracy can be obtained when calculating the support structure in complex form.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV139.26

【参考文献】