含仿生草明渠水流流速结构试验研究

Experimental Research on the Flow Structure in the Open Channel with Bionic Grass

仿生草防护技术是通过降低水下管道附近水流的流速,促进泥沙在管道附近进行沉降淤积以控制冲刷发展的防护技术。目前,对含有仿生草明渠水流流速的研究主要通过测定草前、中、后的流速变化规律,分析仿生草防护段泥砂淤积变化,极少对含仿生草明渠流的全流速场进行有效的测量。利用PIV测试技术对水流作用下仿生草防护段后的流速场进行了测量,分析了仿生草防护段后明渠水流沿流向垂直平面内时均流速分布规律以及草高及铺设间距对流速分布的影响,并深入探讨了仿生草防护段后明渠流脉动流速概率密度分布及脉动流速空间相关性。

The problem of suspension treatment of oil and gas pipelines has been highly concerned by engineering construction units and re⁃searchers.Research shows that the bionic grass can effectively reduce the flow rate,promote sediment deposition,and control the develop⁃ment of the pipeline suspension area.The velocity distribution of open channel flow with bionic grass is very complex.The height and spacing of bionic grass will affect the river flow velocity distribution.At present,the flow velocity in the open channels containing bionic grass is mainly studied by measuring the velocity variation in front,middle and back of bionic grass,but few effective measurements are made for the full velocity field.This paper describes the use of modern means of advanced test by using standard particle image velocimetry(PIV)mea⁃surements with bionic grass along the water channel to the vertical plane of the distribution of velocity field.The probability density distribu⁃tion and spatial correlation of pulsating velocity in the open channel after bionic grass section is further discussed.