规则波作用下墩柱周围流动特性实验研究  

Experiment on characteristics of flow field around cylinder under regular wave

作　　者：王珍[1] 陈杰[1] 何军[1] 

机构地区：[1]长沙理工大学水利学院,湖南长沙410076

出　　处：《长沙理工大学学报（自然科学版）》2008年第3期58-63,共6页Journal of Changsha University of Science and Technology:Natural Science

基　　金：国家自然科学基金资助项目(50479015;10202003);教育部新世纪优秀人才支持项目(NCET-05-0710);湖南省重点学科资助项目;长沙理工大学创新团队资助项目

摘　　要：通过波浪水槽实验研究波浪作用下墩柱周围的流动特性．利用声学多普勒流速仪（ADV）测量墩柱迎浪面、侧面和背部的瞬时流速，通过统计学方法计算得到平均流速、脉动强度和雷诺应力的分布．研究结果表明，墩柱周围的流场呈明显的三维特性．墩柱迎浪面由于反射波与人射波相互影响，三个方向的平均流速均较小．背面由于受到掩护作用，流速三维性减弱；横向、垂向流速基本接近于零；侧面流速值最大，三维性最强．墩柱附近床面横向切应力较小而水平方向的切应力较大，水平脉动强度约为其他两个方向的3～5倍．Cylinder structures have been widely applied in coastal engineering. The characteristics of flow field around cylinder are studied in a laboratory wave flume under regular waves. The Acoustic Doppler Velocimeter （ADV） is used to acquire detailed instantaneous velocity measurements in the front, side and back of cylinder. By statistic analysis, the mean velocity, turbulent intensity, Reynolds stress are observed. It shows that turbulent intensity in the flow field around the cylinder decreases as height of bottom increases. Due to the biinfluence of incidence wave reflecting wave, the average velocities of three directions are small. The 3-D character of flow at back is weakened due to the influence of cylinder. Flow velocity at the side is largest,and 3-D character is strongest. The shear stress in the same direction of wave propagation is larger than transverse shear stress. Horizontal pulse intension is 3-5 times larger than transverse and vertical pulse intension.

关 键 词：墩柱 流动特性 规则波 

分 类 号：TV139.2[水利工程—水力学及河流动力学] P731.22[天文地球—海洋科学]