浅俯淹没射流水力特性

为探讨浅附淹没射流的水力特性,采用粒子成像测速技术获得水垫塘精细流场,系统分析淹没射流区和附壁射流区纵面二维流速分布规律。通过研究获得了淹没射流区和附壁射流区沿流程流速衰减和垂直于主流断面流速分布的公式。结果表明,浅俯淹没射流沿入射角射入水垫塘,射流潜底的俯角大于入射角;淹没射流区沿程流速衰减率大于附壁射流区;淹没射流区和附壁射流区沿程各垂直于主流的断面流速分布具有相似性或自保持性。

Research on the hydrodynamic characteristics of shallow submerged jet with depression angle

In order to study the hydrodynamic characteristics of shallow submerged jet with depression angle, detailed flowing field of plunge pool was obtained by the Particle Image Velocimetry(PIV)technology, and the law of the two-dimensional longitudinal velocity distribution was analyzed systematically. Formulas of the velocity attenuation along the flow-path and the velocity distribution of cross section perpendicular to the primary flow in the submerged plunged jet region and wall attached jet region have been obtained from the study. The results showed that the shallow submerged jet issued into the plunge pool by a incidence angle and the depression angle of dived jet was larger than the incidence angle. Attenuation ratio of velocity in the submerged plunged jet region was greater than that in the wall attached jet region. Besides, the velocity distribution of the cross section perpendicular to the primary flow had similarity or self-holding.