Experimental study of air entrainment in the flow past a cylinder close to a free surface

摘要：

　　The objective of this paper is to experimentally investigate the air entrainment induced by free surface flow past a cylinder.A high-speed digital camera and a 2D-High Speed PIV system are applied to investigate the wake patterns and velocity field.The wake patterns are defined by occurrence or non-occurrence of air entrainment.A regime map of wake patterns is constructed to depict the wake patterns and states, i.e.Froude number (Fr) and gap ratio (h/d).As shown in the wake patterns map, there are two regions with a clear boundary: the upper region represents the air entrainment condition, and the lower region non-air entrainment.With the increasing of Fr, the wake pattern migrates from the non-occurrence of air entrainment state to the occurrence state.While for gap ratio, there only exists a parameter space of 0.64≤Fr≤0.8, in which the wake patterns can change from the non-occurrence state to the occurrence state with the gap ratio increasing.Moreover, two type of air entrainment are observed, namely plunging breaker and counter flow entraining, respectively.

关键词： free surface flow particle image velocimetry high-speed digital camera wake pattern air entrainment

作者: Zhizhong Li Guoyu Wang Biao Huang Mindi Zhang Jiafeng Hao

作者单位: School of Mechanical and Vechicular Engineering, Beijing Institute of Technology, 5 South Zhongguancun Street, Beijing,China

会议类型: 国际会议

会议名称: The Second Conference of Global Chinese Scholars on Hydrodynamics(第二届全球华人水动学学术会议)

会议地点: 江苏 无锡

会议语种:英文

页码: 95-101

在线出版日期: 2016-11-11（万方平台首次上网日期，不代表论文的发表时间）