摘要
通过模型试验和理论分析, 研究了低Fr 数( Fr< 7) 流动情况下空腔积水对跌坎掺气设施水力及掺气特性的影响. 建立了计算跌坎掺气设施水力及掺气特性的预测数学模型. 给出了射流出射角的修正式; 积水尺寸的计算式; 掺气设施实际运行工况( 空腔长度、空腔负压、掺气量等) 的预估方法. 研究表明, 低Fr 数流动情况下, 由于重力作用显著, 积水对水力及掺气特性均有显著影响.
The effect of water contained in cavity to hydraulic and aeration characteristics of step aerator in low Froude number flow(Fr<7) is investigated experimentally and theoretically. The mathematical model for predicting the hydraulic and aeration characteristics of aerator is established and the correction for the emergence angle of the jet is deduced. The expressions for calculating the volume of the water contained in cavity, length of cavity, pressure in cavity and the air entrained are proposed. It is concluded that the water contained in cavity may significantly affect the characteristics of flow and aeration.
出处
《水利学报》
EI
CSCD
北大核心
2000年第2期27-31,共5页
Journal of Hydraulic Engineering
基金
四川大学高速水力学国家重点实验室基金
关键词
掺气设施
跌坎
佛氏数
水力特性
掺气特性
step aerator
Froude number
hydraulic and aeration characteristics