中文摘要：

基于模型试验和大涡模拟紊流模型及具有自由面追踪功能的VOF单流体模型,对中闸室出口处突扩突跌掺气设施侧空腔长度和侧墙上的水力特性进行了试验和数值模拟研究。试验与数值模拟结果表明：大涡模拟可以更为精细地揭示近壁水流特性。本文的掺气设施可形成较长的侧空腔,水流与侧墙接触后侧墙上未见负压区存在,水流对侧墙的动态冲击会在靠近侧墙的下游水流中形成大量气泡;较大的水翅不利于侧空腔的掺气,并会引起下游水流产生不利的流态。

英文摘要：

Numerical simulations of large eddy simulation（LES） and VOF method and model test were used to study lateral cavity length and hydraulic characteristics on side wall of an aerator device with abrupt lateral expansion and bottom offset located at the outlet of a mid-gate chamber.Results show that the LES method reveals the details of flow characteristics near the wall.The adopted aerator device can create a long side cavity,and no negative pressure zone appears on the side wall downstream the contact of jet nape to the wall.Under the impact of jet nape on the side walls,a great quantity of bubbles are formed near the side walls in the flow downstream.Generally,large water wings reduces the aeration capacity of flow near side wall and causes unfavorable flow conditions.