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低水头枢纽通常采用消力池底流消能的方式来消减泄水闸下泄水流的能量,而消力墩的位置对水跃的形式、强弱影响较大,从而影响整个消力池的消能率。采用计算流体力学软件Fluent的VOF模型,探讨消力墩位置对消力池内水跃特征、湍动能耗散率分布及消能率的影响。结果表明:消力墩位置会影响消力池消能率——消力墩布置在消力池长度的0.65及以上时,其消能效果与不布置消力墩时相差不大;消力墩布置在消力池长度的0.35处时,消力池的消能率最大,比布置在0.65时消能率提高约10.5%。 相似文献
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This study performed experimental investigation on the dynamic response of an in-place floating offshore wind turbine (FOWT) under freak wave actions. Based on the method of wave profile modulation, various freak wave profiles embedded in unidirectional Gaussian seas were generated in wave basin and the action of these waves on the FOWT was measured and analyzed, which has not been done before. The motions of FOWT were analyzed in time domain as well as time-frequency domain. The effect of freak wave parameters on FOWT motions was addressed, i.e., freak wave height, freak wave period, large crest, and deep trough. The dynamic response of FOWT was observed as a spike at the occurrence of freak wave in a conventional random wave, where the impact of freak wave can last for 17 spectral peak periods of wave. Data analysis shows that the motions of FOWT increased linearly with the freak wave height. In addition, the occurrence of freak wave induced the coupled effect on surge and pith, which was strengthen with the increase of freak wave height and wave period. Compared to a large crest, a deep trough of freak wave led to stronger motions and was supposed to be a key concern on the safety of the FOWT. The novel findings in this study provided a reference for the design of survival load on a FOWT and benchmarks for validating numerical models. 相似文献
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