溢流反弧段紊流过渡区紊动特性的试验研究

The Experiment Researches about Turbulence Characteristics of Transition Region of Turbulent Flow over the Spillway Buckets

本文利用高速水力学国家重点实验室的激光测速系统,对两种反弧半径,三种不同粗糙度的溢流反弧段的水流流速进行了量测。对反弧段边界层的紊动特性进行了分析。给出了反弧段沿水流方向的脉动流速均方值和紊动强度（-u＇x2）^（1/2）/Ue,可以看出,不仅反弧曲率对紊动强度有明显的影响,而且粗糙度使得紊动强度加剧。

The velocities over the spillway buckets of three roughness surfaces and two radius are measured by LDV in the National Key Laboratory of the Hydraulics for the High-velocity of CUST. The turbulence characteristics are analysed, and the mean square roots of fluctuating velocity and the turbulent intensity ux2 /Ue are shown along the flowing direction of the spillway buckets in this paper. The analytical results show that the effects of curvature of the buckets on the turbulent intensity is obvious and the surface roughness of the buckets make the turbulence intensity aggravating.