挑流反弧段水流掺气浓度的试验研究

通过泄槽水力学模型试验,研究了溢洪道、泄洪洞等泄水建筑物挑流反弧段掺气浓度的沿程变化规律;分析反弧段掺气浓度分布与挑坎高度、挑流段反弧半径以及来流流量之间的关系,以期为优化掺气坎体型及掺气坎下游设施提供依据。试验结果表明,挑流反弧段水流表、中、底不同部位掺气浓度的沿程衰减率是不相同的;在试验范围内,挑流反弧段水流掺气浓度随掺气坎高和反弧半径的增大而增大,随流量的增加而减小。

Experimental study on air concentration in flow over flip bucket

Through the hydraulic model experiment for chute，the law of the change of the air concentration along the flip bucket of the discharge structures such as spillway，discharge tunnel，etc. is studied herein，and then the relationship in between the air concentration distribution along the flip bucket and the height of aerator，radius of flip bucket as well as the inflow rate is analyzed，so as to provide a basis for optimizing the shape of the aerator and its downstream facilities. The experiment result shows that the attenuation rates of the air concentrations of the surface flow，the mid-layer flow and the under flow along the flip bucket are different. Within the scope of the experiment，the air concentration in the flow over the flip bucket is increased along with the increases of both the height of aerator and the radius of flip bucket，while it is decreased along with the increase of flow rate.