泄槽反弧段掺气坎的空腔特性

空腔特性是影响掺气效果的重要因素之一,而空腔长度和空腔积水是反映掺气空腔特性的两个重要指标。通过二维数学模型建立和数值模拟计算,对反弧半径、掺气坎体型与反弧段水流特性及掺气空腔特性的影响关系进行研究。根据数值模拟结果可以看出,反弧半径的增大会引起空腔长度的增长而减短空腔积水长度;挑坎坡度越陡,空腔长度和空腔积水长度都会变得越长;空腔长度和空腔积水长度都与挑坎高度成正比关系。本结果可以为优化掺气设施提供科学依据。

Study on the Cavity Length Over the Chute with an Anti-arc Section

The cavity characteristic is an important factor affecting the flow aerator,while the cavity length and backwater in cavity are two important indicators which reflect the characteristics of aerated cavity.In this paper,a two-dimensional numerical model was developed to investigate the relationships among the anti-arc radius,the shape of aerator,the characteristics of anti-arc flow,and the characteristics of aeration cavity.The simulated results showed that the increasing of the anti-arc radius results in the increasing of the cavity length and the decreasing of the length of the backwater in cavity.The steeper the bucket slope is,the longer both the lengths of the cavity and backwater in cavity are.The cavity length,as well as the length of the backwater in cavity,is proportional to the bucket height.The results can provide scientific references for the optimization of the aerators.