摘要
为了深入了解干支流汇合口水流的运动特性,通过概化模型试验,利用ADV流速仪对顺直型支流与弯曲型干流60°交汇角的汇合口区域进行了垂线流速测量,验证了试验数据的可靠性,分析了弯道干支流汇合口区域垂线流速分布特性。结果表明,随汇流比增大,交汇断面上游纵向流速减小,交汇口各断面径向流速绝对值增大,断面环流方向发生改变;汇流比较大时,交汇断面最大纵向、径向流速点出现于凹岸侧;交汇断面下游附近最大纵向、径向流速偏向弯道中心线;在交汇断面下游附近的凹岸出现水流分离区。
In order to deeply understand the flow structure in channel confluences, based on physical model test, ADV velocimetry is used to measure the velocity profiles at the junction of bend stream with branch afflux. The tributary stream connected with the bend main stream at the top of the bend at the angle of 60°. The experimental data is validated and applied to investigate the vertical velocity distribution at the confluence. The results show that with increase of dis- charge ratio, the longitudinal velocity at upstream section decreases and the absolute value of radial velocity at intersection increases; meanwhile, the circulation direction on the section changes; when discharge ratios is larger, the maximum ve- locity in intersection appears the side of concave bank and the maximum velocity in downstream section deflects to the cen- ter line of the bend; separation zone of water flow appears at the concave bank in downstream section.
出处
《水电能源科学》
北大核心
2012年第7期90-93,220,共5页
Water Resources and Power
基金
高等学校博士学科点专项基金资助项目(2006048030)
关键词
弯道干流
交汇口
汇流比
流速分布
模型试验
bend main river
confluence
discharge ratio
velocity distribution
model test
