用普林斯顿管测量明槽表面切应力

本文根据Preston管的理论基础——紊流边界层中的“壁面律”,采用自制的Praston管在率定流速的水槽中进行了对比验证,结果由Preston管测得的流速与标准流速吻合很好.利用带静压管的Preston管,测量了连续弯道的床面切应力,通过弯道床面切应力的分布规律进行了初步分析

Measurement for Boundary Shear on Smooth Bed in the Open Channel with Preston Tube

The theory base of Preston tube is the wall law of turbulent boundary, the Preston tubes were made according to the Preston tube theory base. The velocity measured by the preston tube was compared with the Velocity in the flume, and the results were in close agreement with the standard velocity. The boundary shear on smooth bed of bends were measured with the Preston tube, and the law of the shear distribution for bends was analyzed.