Inception point of air entrainment over stepped spillways

作     者：WU Jian-hua ZHANG Bin MA Fei 

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

出 版 物：《Journal of Hydrodynamics》 (水动力学研究与进展B辑（英文版）)

年 卷 期：2013年第25卷第1期

页      面：91-96页

核心收录：

学科分类：081504[工学-水利水电工程] 08[工学] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 082201[工学-制浆造纸工程] 0802[工学-机械工程] 0822[工学-轻工技术与工程] 0701[理学-数学] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.51179114) 

主　　题：air entrainment cavitation energy dissipation inception point stepped spillway unit discharge 

摘      要：The location of the inception point of the air entrainment directly affects the energy dissipation ratio, the cavitation damage control, and the training wall height designs for a stepped spillway and a stilling basin. In this paper, the boundary layer theory of plates is used to predict the location of the inception point of the air entrainment over the stepped spillways by assuming the steps on the spillways as a kind of roughness. An empirical formula is presented based on the physical model experiments, with the maximum error less than 1% except at one point where the error is 1.6%, as compared to the experimental data. Meanwhile, it is shown that the location of the inception point of the air entrainment for the stepped spillway is much nearer to the top of the spillway than that for a smooth spillways, which explains why the high ratio of the energy dissipation is provided for the stepped spillway.