二维半岛尾流近区流动参数分布特性的研究

采用数字粒子图象测速技术,在恒定来流的工况下,分别对圆柱、正弦形状半岛的尾流近区的速度分布进行了比较详细的测量,获得了大量的数据。从相似性的角度,对流速在尾流摆动一个周期内的平均值进行了分析。结果显示,沿程各断面的此种平均流速在归一化后具有一定程度的相似性,而各断面归一化紊动参数分布的差别很大。

Research on the Flow Field Characteristics of the Near Wakes Behind 2-D Peninsulas

By applying Digital Particle Image Velocimetry (DPIV) technique, velocity fields in the near wakes behind semicircular and sinusoidal shaped peninsulas in constant inlet flow are measured in detail respectively, and a large number of quantitative data are acquired. This paper puts enough emphasis on the similarity in analyzing the mean velocity over a long period of time (where the long period is referred to as a cycle of the Karman Vortex Shedding). In this way we attempt to find out some disciplines of the velocity distribution in this region. The averaged velocity distribution in each transect seems to approximately obey the similarity law after normalization,but the turbulent parameters distributions are quite different.