Hydraulic characteristics of stepped spillway dropshafts

作     者：SHEN JieYi WU JianHua MA Fei 

作者机构：College of Water Conservancy and Hydropower Engineering Hohai University 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2019年第62卷第5期

页      面：868-874页

核心收录：

学科分类：081504[工学-水利水电工程] 080103[工学-流体力学] 08[工学] 080104[工学-工程力学] 081502[工学-水力学及河流动力学] 0815[工学-水利工程] 0801[工学-力学（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(Grant No.51779081) 

主　　题：dropshaft end sill height hydraulic characteristics step rotation angle stepped spillway 

摘      要：Nowadays, Sponge Cities are being built to provide a valid solution to the glaring drainage problems in the urban areas of China. The hydraulics of a dropshaft, especially discharge capacity, energy dissipation and cavitation damage control, evidently affect its safety and the city s underground tunnel system, due to the high dropshaft and large discharge. The hydraulic characteristics of stepped spillway dropshafts are experimentally investigated for the variable step rotation angles and end sill heights. Flow regimes inside the dropshafts are classified under the different approach flow discharges. The results illustrate that there is high energy dissipation in the present dropshafts with the stepped spillway and the cavitation damage could be effectively avoided thanks to the effect of the air entrainment to the flow.