中文摘要：

采用粒子成像测速技术（PIV），获得了水垫塘冲击射流全域瞬时精细流场，在此基础上，对淹没射流区的流速分布规律和水流紊动特征进行了系统研究。结果表明：淹没射流区射流横向断面的流速、紊动强度分布呈自相似分布规律；在射流纵向，射流轴线最大流速随着流程增加而呈-1次幂规律减小，射流半扩展宽度和紊动强度则随流程增加而线性增大；并提出了描述淹没射流区射流横向断面流速、紊动强度分布规律的方程，同时得到淹没射流区射流纵向上流速、半扩展宽度和紊动强度沿流程变化的计算公式。

英文摘要：

Particle image velocimetry （PIV） was used to characterize the fine structure of flows in a plunge pool with an oblique submerged jet, and jet velocity distributions and turbulent characteristics in the jet- plunging region have been studied systemically. The results showed self-similarity in cross-sectional profiles of velocity and turbulent intensity in this region. Peak velocity at the jet center decreased in inverse proportion to the length of jet path, while turbulent intensity and jet half-width increased linearly with the path length. Equations for jet velocity distribution and turbulent intensity distribution are given in this paper, along with empirical formulas for calculations of jet velocity, turbulent intensity, jet half- width at different lengths of jet path.