水垫塘不同水流结构区掺气浓度分布规律试验研究

发布时间：2018-03-10 10:24

本文选题：模型试验　切入点：水力条件　出处：《水利水电技术》2017年05期 　论文类型：期刊论文

【摘要】：为了得到水垫塘局部掺气浓度分布规律,减少过流边壁空蚀破坏的发生,采用水力学模型试验的方法,将水垫塘内水体进行水流结构分区,通过改变泄流流量、水流入射角度、水垫深度三个条件,实测水垫塘不同水流结构区掺气浓度值,研究气体在不同水流结构区的运动机理。对试验所测数据进行整理得到水垫塘不同水流结构区掺气浓度分布曲线,且不同的水力条件与其拟合近似为二次曲线关系。通过分析得到水垫塘不同水流结构区掺气浓度分布规律如下:各水流结构区掺气浓度随泄流流量增大而增大;射流与附壁射流区紊动掺混随泄流流量增大而更加剧烈;掺气浓度随水垫深度增大而减小;淹没射流区与旋滚区掺气浓度随水流入射角度增大而减小,附壁射流区掺气浓度随入射角度增大而增大,但变化不明显。
[Abstract]:In order to obtain the distribution rule of local aeration concentration in water cushion pond and reduce the cavitation damage of the overflowing side wall, the hydraulic model test method is used to partition the flow structure of the water body in the cushion pond, and the flow incidence angle is changed by changing the discharge rate. Under three conditions of water cushion depth, the aeration concentration in different flow structure areas of water cushion pond is measured, the movement mechanism of gas in different flow structure area is studied, and the distribution curve of aeration concentration in different flow structure area of water cushion pond is obtained by sorting out the measured data. The distribution of aeration concentration in different flow structure areas of water cushion pond is as follows: the aeration concentration in each flow structure area increases with the increase of discharge rate; The turbulent mixing between jet and wall jet region is more intense with the increase of discharge rate, the aeration concentration decreases with the increase of water cushion depth, and the aeration concentration decreases with the increase of incidence angle of water flow in submerged jet zone and rolling zone. The aeration concentration increases with the increase of incidence angle, but the change is not obvious.
【作者单位】：昆明理工大学电力工程学院;楚雄欣源水利电力勘察设计有限责任公司;
【基金】：国家自然科学基金“跌坎型底流消能工水流流动水力特性研究”(51169008);国家自然科学基金“高坝泄洪消能不同水流结构下气体迁移扩散运动机理研究”(51669007)
【分类号】：TV135.2

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