弧形闸门前漩涡特性研究

发布时间：2018-03-29 05:40

本文选题：弧形闸门　切入点：漩涡　出处：《水利水运工程学报》2017年02期

【摘要】：吸气漩涡是水利工程中进水口前常见的水力学问题,模型试验是研究进水口前漩涡特性的常用方法。目前关于漩涡特性的研究主要集中在淹没水深较大、进水口结构不变的泄洪洞以及电站进水口等,而对于弧形闸门局部开启时闸前漩涡特性的研究较少。为了研究弧形闸门前漩涡的水力特性以及黏性力和表面张力对弧形闸门前漩涡的影响,以某泄洪闸弧形闸门为研究对象,采用2个不同比尺的模型试验及理论分析方法,对弧形闸门局部开启时闸前吸气漩涡的水力特性进行了研究。结果表明,闸前漩涡是行进水流横向和纵向突然收缩共同作用的结果。弧形闸门前水面紊动较大,所以闸前漩涡频率较高,持续时间较短,闸门开度越大,闸前吸气漩涡越强。若按照弗劳德数准则设计模型试验,当来流雷诺数和韦伯数大于某一临界值时,可以忽略黏性力和表面张力影响。
[Abstract]:Suction vortex is a common hydraulics problem before intake in hydraulic engineering, and model test is a common method to study the characteristics of vortex in front of intake. At present, the research on swirl characteristics is mainly focused on submerged water depth. The structure of the inlet is unchanged, the flood discharge tunnel and the inlet of the power station, etc., In order to study the hydraulic characteristics of the front vortex and the influence of viscosity force and surface tension on the vortex in front of the arc gate, the arc gate of a floodgate is taken as the object of study, and there is little research on the characteristics of the vortex in front of the gate when the arc gate is opened locally, and in order to study the hydraulic characteristics of the vortex in front of the gate and the effect of viscosity and surface tension on the vortex in front of the arc gate, By using two different scale model tests and theoretical analysis methods, the hydraulic characteristics of the suction vortex in front of the gate when the arc gate is partially opened are studied. The results show that, The vortex in front of the sluice is the result of the transverse and longitudinal sudden contraction of the traveling flow. The turbulence of the water surface in front of the arc gate is greater, so the vortex in front of the gate has a higher frequency and a shorter duration, and the greater the opening degree of the gate is, When the Reynolds number and Weber number of incoming flow are larger than a certain critical value, the influence of viscosity and surface tension can be ignored.
【作者单位】：大连理工大学;
【基金】：国家自然科学基金资助项目(51479022,2014001)
【分类号】：TV663.2

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