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进水池表面吸气涡数值模拟与试验
引用本文:吴鹏飞,郭志伟,钱忠东,王志远,陈芳. 进水池表面吸气涡数值模拟与试验[J]. 农业机械学报, 2018, 49(2): 120-125
作者姓名:吴鹏飞  郭志伟  钱忠东  王志远  陈芳
作者单位:武汉大学,武汉大学,武汉大学,武汉大学,武汉大学
基金项目:国家自然科学基金项目(51422906、51609177)
摘    要:为了有效地消除表面吸气涡,对进水池内流场进行了数值计算,模拟了表面涡吸气的动态过程;建立了试验模型,验证CFD方法的可靠性;并提出了圆形盖板消涡装置,探求其有效性;采用了螺旋度密度分析法,揭示了表面涡的吸气及其抑制机理。结果显示:采用的CFD方法可以较好地预测表面吸气涡的动态过程;吸气准备阶段,自由水面出现凹陷,喇叭管进口附近形成螺旋度密度管;随着气体从自由水面进入水体,自由水面下方形成另一螺旋度密度管;当连续气柱形成时,两个螺旋度密度管相互连通,形成气体通道;通过在自由水面和喇叭管进口之间放置一定尺寸的圆形盖板装置,可以消除表面吸气涡。

关 键 词:进水池  表面涡  吸气  数值模拟
收稿时间:2017-09-30

Numerical Simulation and Experiment on Free-surface Air-entraining Vortices in Pump Sump
WU Pengfei,GUO Zhiwei,QIAN Zhongdong,WANG Zhiyuan and CHEN Fang. Numerical Simulation and Experiment on Free-surface Air-entraining Vortices in Pump Sump[J]. Transactions of the Chinese Society for Agricultural Machinery, 2018, 49(2): 120-125
Authors:WU Pengfei  GUO Zhiwei  QIAN Zhongdong  WANG Zhiyuan  CHEN Fang
Affiliation:Wuhan University,Wuhan University,Wuhan University,Wuhan University and Wuhan University
Abstract:In order to suppress the free-surface air-entraining vortex in pump sumps, the three-dimensional unsteady vortex flow in a pump sump was calculated by computational fluid dynamics (CFD) method. The dynamic process of the free-surface air-entraining vortex was simulated. And an experimental model was conducted to verify the CFD method. In this experimental model, a circular plate device was placed between the free surface and the inlet of the bell-mouth to suppress the air entrainment. Furthermore, a parameter called helicity density was adopted to reveal the mechanism of air-entrainment and its suppression. The results showed that the numerical method used in this study can predict the dynamic process of air-entrainment for the free-surface vortex accurately. The helicity density played a very important role in the formation of air entrainment. When the dimple appeared on the free surface, a helicity density tube was formed around the inlet of the bell-mouth. As air entered into water, the other helicity density tube was formed under the free surface. When the two helicity density tubes were connected with each other, the air-core from the free-surface to the inlet of the bell-mouth was formed. This meant that the mechanism of air-entrainment for the free-surface vortex was the connection of the helicity density tubes which provided a passage for air to pass through. Moreover, the circular plate with enough dimension can successfully suppress the air-entrainment through cutting off the helicity density tubes.
Keywords:pump sump  free-surface vortex  air entrainment  numerical simulation
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