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流动边界出现凸出障碍物会引起边界层分离,导致回流发展、流态恶化、泥沙淤积等一系列问题。作者在50cm宽的水槽中进行了系列实验,用丁坝模拟凸出障碍物,采用“吸、喷”水方法。这样可以改变障碍物周围的水流流态,缩小其尾流回流范围,大幅度减少回流淤积,效果十分明显。根据大量实验数据得出了“吸、喷”流量大小与回流尺度减小和回流淤积减少的关系式。研究结果有重要的学术意义和很大的实用价值。
Prominent obstacles on the flow boundary will cause the boundary layer to separate, resulting in a series of problems such as the development of backflow, the deterioration of flow regime and sedimentation. The author conducted a series of experiments in a 50cm wide flume and simulated the obstacles with a dyke dam using a “suction, spray,” water method. This can change the water flow around obstacles, reduce the scope of its wake backflow, significantly reduce the backflow siltation, the effect is very obvious. Based on a large number of experimental data, the relationship between the size of the “suction and spray” flow and the size of the backflow and the decrease of the backflushing sedimentation is obtained. The research results have important academic significance and great practical value.