Experimental Investigation on the Effects of aeration on the Velocity Attenuation of Jet Flow

Wei Wang-Ru

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Experimental Investigation on the Effects of aeration on the Velocity Attenuation of Jet Flow

更新时间：2023-11-14

- Experimental Investigation on the Effects of aeration on the Velocity Attenuation of Jet Flow
- Advanced Engineering Sciences Vol. 43, Issue Z1, Pages: 29-33(2011)
- 作者机构：
  
  四川大学水力学与山区河流开发保护国家重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published：2011，
  
  Published Online：25 April 2011，
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卫望汝.掺气对射流轴线速度衰减影响的试验研究(“研究生论坛”稿件)[J].工程科学与技术,2011,43(Z1):29-33.

Wei Wang-Ru. Experimental Investigation on the Effects of aeration on the Velocity Attenuation of Jet Flow. [J]. Advanced Engineering Sciences 43(Z1):29-33(2011)
卫望汝.掺气对射流轴线速度衰减影响的试验研究(“研究生论坛”稿件)[J].工程科学与技术,2011,43(Z1):29-33. DOI：

Wei Wang-Ru. Experimental Investigation on the Effects of aeration on the Velocity Attenuation of Jet Flow. [J]. Advanced Engineering Sciences 43(Z1):29-33(2011) DOI：

摘要

中文摘要: 通过物理模型试验，采用CQY—Z8a型针式掺气流速仪测量了掺气射流的轴线速度，对不同条件下的掺气射流轴线速度衰减情况进行了对比研究，分析了入射水流速度、掺气浓度以及射流水股厚度对射流轴线速度衰减的影响，获得了掺气射流轴线速度衰减的变化规律。结果表明：在本试验条件下，射流轴线速度呈线性衰减；入射水流速度对射流轴线速度衰减基本没有影响，表现为不同入射水流速度时，各衰减趋势基本一致；掺气浓度越大，射流轴线速度衰减越快；射流水股厚度越小，射流轴线速度衰减越快。因此提高射流水体的掺气浓度，尽可能分散入水水体，可以加快射流轴线速度衰减，有效减弱射流对下游河床的冲刷。

Abstract

Abstract:Based on model experiment，the velocities of jet flow along the axis were measured

using the CQY—Z8a velocimeter. The velocity attenuation of jet flow along the axis under different conditions has been studied respectively. The effects of aeration concentration

jet velocity at entry and thickness of jet flow on the velocity attenuation of jet flow have been analyzed. Through analysis we could see that the velocity attenuation of jet flow along the axis changed in laws. It was demonstrated by the test results that under the experimental conditions，the velocity along the axis decreased linearly; the higher the air concentration

the faster the velocity decayed；the thinner the jet flow

the faster the velocity decayed. The jet velocity itself at entry had no influence on the law of velocity attenuation，as the lines of velocity attenuation at different velocities at entry were practically parallel. Therefore

improving the air concentration of jet flow and dispersing the jet flow in the plunge pool could reduce the influence of jet flow on scour.

关键词

射流掺气浓度流速

Keywords

jet flowaeration concentrationvelocity

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Yellow River Inst. of Hydraulic Research

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State Key Lab. of Hydraulics and Mountain River Eng., Sichuan Univ.

中国科学院山地灾害与地表过程重点实验室四川

四川大学水力学与山区河流开发保护国家重点实验室

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