發(fā)布時間：2018-07-01 12:00

  本文選題：多相流 + 非定常��； 參考：《南京航空航天大學》2017年碩士論文

【摘要】：海上風資源相對于陸上具有較為明顯的優(yōu)勢,其通常具有更高的年平均風速、更低的湍流度以及更小的風剪切效應,但海上復雜波浪和洋流等對支撐結(jié)構(gòu)產(chǎn)生的非定常水動載荷對機組的動態(tài)性能將產(chǎn)生明顯的影響�？紤]海上風力機波浪載荷計算的復雜性,以單樁式支撐結(jié)構(gòu)為研究對象,分別采用數(shù)值水池方法和莫里森方法計算了支撐結(jié)構(gòu)受到的波浪載荷。首先采用Morison方法計算海上支撐結(jié)構(gòu)的波浪載荷,基于波浪頻譜和線性疊加法可以有效的模擬海浪,通過相應波浪理論的分析同時使用Morison方程即可求得波浪載荷。數(shù)值水池主要基于Fluent軟件進行構(gòu)建。在Fluent中運用VOF模型捕捉波浪運動的自由表面,使用UDF模塊及動網(wǎng)格技術實現(xiàn)造波和消波的過程,通過不可壓非定常求解器實現(xiàn)數(shù)值水池的構(gòu)建,最后利用三維數(shù)值水池計算海上風力機支撐結(jié)構(gòu)的波浪載荷。兩種方法的結(jié)果對比分析表明,Morison方法在海上風力機單樁支撐結(jié)構(gòu)波浪載荷計算時具有較好的精度且計算效率較高,而多相流方法能夠給出更為詳細的流場信息和波浪情況,在對復雜形式的支撐結(jié)構(gòu)計算時能夠給出更好的計算精度。
[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.
【學位授予單位】：南京航空航天大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV139.26

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本文編號：2087711