SIMULTANEOUSLY MEASUREMENTS OF VELOCITY AND PRESSURE ON THE BED WALL IN A BACKWARD-FACING STEP FLOW

摘要：

A revetment block which is located just downstream of a weir is sometimes destroyed during the flood. The one of the reason why the revetment is destroyed is pressure fluctuations near the bed. The drag and lift forces of bed materials on the bed are measured by many researchers. Turbulent structure in open-channel flows behind a backward-facing step is also investigated with a PIV and LDA. In contrast, pressure fluctuations on the bed were not measured, due to its difficulty. In this study, simultaneously measurements of velocity and pressure on the bed wall in a backward-facing step flow were conducted with a PIV and pressure transducer. It was found that the instantaneous pressure increases when the K-H instability vortex which is generated behind the step is falling toward the bed wall. The kolk-boil vortex is generated after the K-H instability vortex hit on the bed wall.

关键词： backward-facing step instantaneous pressure PIV simultaneously measurements

作者: Kouki Onitsuka Juichiro Akiyama Yoshitake Zohshi

作者单位: Kyushu Institute of Technology, Kita-Kyushu, Japan

会议类型: 国际会议

会议名称: 第16届亚太地区国际水利学大会暨第3届水工水力学国际研讨会(16th IAHR-APD Congress and 3rd Symoposium of IAHR-ISHS)

会议地点: 南京

会议语种:英文

页码: 1989-1994

在线出版日期: 2008-10-20（万方平台首次上网日期，不代表论文的发表时间）