跌流竖井进水管附近负压突增现象的机理解析及结构优化

芦三强; 魏佳芳

doi:10.13205/j.hjgc.202402011

跌流竖井进水管附近负压突增现象的机理解析及结构优化

doi: 10.13205/j.hjgc.202402011

芦三强,
魏佳芳^,

兰州理工大学能源与动力工程学院, 兰州 730050

基金项目:

兰州理工大学2020年红柳优秀青年人才计划资助项目(062004)

甘肃省青年科技基金计划项目(22JR5RA287)

详细信息

作者简介:
芦三强(1995-),男,硕士,主要研究方向为水气两相流。2692249507@qq.com

通讯作者:
魏佳芳(1989-),女,副教授,主要研究方向为城市水力学。weijiafang2006@126.com

计量
- 文章访问数: 90
- HTML全文浏览量: 11
- PDF下载量: 4
- 被引次数: 0
出版历程
- 收稿日期: 2022-09-29
- 网络出版日期: 2024-04-28

MECHANISM ANALYSIS AND STRUCTURAL OPTIMIZATION OF SUDDEN INCREASE OF NEGATIVE PRESSURE NEAR WATER INLET PIPE OF A DROPSHAFT

LU Sanqiang,
WEI Jiafang^,

College of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

摘要

摘要: 为明晰跌流竖井进水管附近负压突增的机理以及降低竖井内的负压,基于计算流体动力学软件Fluent模拟了竖井模型内的水气两相分布规律及气压分布情况,同时对竖井模型进行了结构优化并评估了其性能。结果表明:当无量纲流量Q^*_w>0.08时,进水管附近的负压开始突增,而小流量下基本无变化;入流水舌是导致负压突增的主要原因,其压缩了气体流动的空间,增大了气体过流时的损失,造成水舌下方补气不足。研究还表明:优化竖井模型通过有旋分流隔板在进水口正对面形成了1个不过水的空腔区域,其强制扩大了气体过流的空间,基本保证了进水管附近气体的流动不受水流的影响,同时还降低了井内的负压和气压梯度。
- 跌流竖井 /
- 水气两相流 /
- 数值模拟 /
- 水舌 /
- 结构优化
Abstract: To clarify the mechanism of the sudden increase of negative pressure near the water inlet pipe and reduce the negative pressure in the dropshaft, the water-air two-phase and air pressure distribution in the dropshaft model were simulated based on the computational fluid dynamics software Fluent. Then, the relationship between the water tongue and the air pressure change near the water inlet pipe was analyzed. Finally, an optimized dropshaft model was proposed and its effect was evaluated. The results showed that when the dimensionless water flow rate was greater than 0.08, the negative pressure near the water inlet pipe began to increase suddenly, and there was basically no change under a small flow rate. The water tongue was the main reason for the sudden increase of negative pressure, which occupied the space of air circulation and increased the loss of airflow. The air supply under the water tongue was insufficient, so the negative pressure would suddenly increase. The study also showed that the optimized dropshaft model formed a water-free cavity area in the space enclosed by the circular diaphragm and the shaft wall opposite the water intake pipe, which expanded the space for airflow, basically ensuring that the airflow near the water inlet pipe was not affected by the water flow, and also reduced the negative pressure and air pressure gradient in the dropshaft.
- plunging-type dropshaft /
- water-air two-phase flow /
- numerical simulation /
- water tongue /
- structural optimization

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