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本文从理论上分析了明槽紊流存在分区结构,给出适用于各区的时均流速分布公式,进一步利用一维激光测速仪对沿流向的流速值息进行量测,用实测的断面时均流速分布验证了分区的必要性和合理性.(?)果表明常用的流速对数分布律仅适用于y/H<0.2的内区.Karman常数定为0.4较合理;积分常数A与水力条件和壁面情况有关.作者对沿流向的紊动强度进行了分析,认为从紊动强度沿断面的分布可更清楚说明明槽紊流复杂的分区结构.
In this paper, the partition structure of turbulent flow in open channel is analyzed theoretically, and the formula of hourly average velocity distribution for each area is given. The value of flow velocity along the flow direction is measured by one-dimensional laser velocimeter. The velocity distribution proves the necessity and rationality of zoning. () The results show that the commonly used logarithmic distribution of velocity is only applicable to the inner region with y / H <0.2. The Karman constant is more reasonable than 0.4; the integral constant A is related to hydraulic conditions And the wall condition.The authors analyzed the turbulence intensity along the flow direction and concluded that the complicated turbulent zoning structure can be explained more clearly by the distribution of turbulent intensity along the section.