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| | The paper mainly describes the turbulent flow velocity characteristics of five typical flow patternsfor surface flow energy dissipation, summaries the longitudinal variation laws of time average flow velocitynear bottom and turbulent intensity, presents the probablly occurrent maximum instantaneous value of turbulentflow velocity near bottom and calculation formula at corresponding position. One of the main hydraulic parameters considered in downstream anti-scour d... | | 本文主要论述了面流消能五种典型流态近底紊动流速特性,总结出了近底时均流速和紊动强度沿程变化规律,提出了近底紊动流速可能出现的最大瞬时值及相应位置的计算公式。面流消能工程的下游防冲设计中考虑的主要水力参数之一是,消能段近底流速紊动可能出现的最大瞬时值及其相应的部位,但目前国内外研究成果较少。笔者通过水工模型试验重点研究了面流消能各典型流态近底流速及其紊动纵向分量沿程的变化规律,并提出了计算公式,为优化面流设计提供科学依据。 | | 文摘来源 | | The paper mainly describes the mechanism of surface flow energy dissipation,analyses the test results in application with dimensional principle and summarizes as five estimation formulae of percentage of energy dissipation for the hydraulic jump zones of typical flow patterns,that can be provided to selecting flow pattern of effectire energy dissipation as main applicated one. | | 论述了面流消能的消能机理,并应用量纲原理分析了试验成果,总结出了面流消能五种典型流态旋滚区消能率的计算式,可供设计选择消能效果好的流态作为主要的应用流态时参考。 | | 文摘来源 | | The statistf water surface fluctuation below downstrearn gyre of surface flow energy dissipation aredescribed.The analysis shows that the probability density of wave surface amplitude basically corresponds tonormal distribution and that of mean wave height approximates Rayleigh distribution. The tentative approachis also done for wave transmission velocity and wave length below gyre. | | 论述了面流消能下游旋滚后水面波动的统计特性。分析表明,波面振幅的概率密度基本符合正态分布,平均波高的概率密度接近瑞利分布。对旋滚后的波动传递速度与波长也作了初步探讨。 | | 文摘来源 | |   | | << 更多相关文摘 |
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