THREE-DIMENSIONAL NUMERICAL SIMULATION OF AERATED FLOWS DOWNSTREAM SUDDEN FALL AERATOR EXPANSION-IN A TUNNEL  

作　　者：ZHANG Jian-min CHEN Jian-gang XU Wei-lin WANG Yu-rong LI Gui-ji 

机构地区：[1]State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu 610065,China

出　　处：《Journal of Hydrodynamics》2011年第1期71-80,共10页水动力学研究与进展B辑（英文版）

基　　金：Project supported by the Key Science Foundation of Ministry of Education of China (Grant No. 2008108111);the National Basic Research Program of China (973 Program, Grant No. 2007CB714105);the Program of New Century Excellent Talents in University (Grant No. NCET-08-0378)

摘　　要：Air entrainment is known to be one of efficient and inexpensive methods to prevent cavitation damages in hydropower projects.The shape of sudden expansion-fall is used as a common device for mitigating cavitation erosions.The complex flow patterns with cavitation are numerically simulated by using the realizable k-εturbulence model and the air-water mixture model.The calculated results are compared well with the experimental results as well as those obtained with the k-εturbulence model with the Volume Of Fluid（VOF）Model.The calculated results agree well with the experimental data for the aeration cavity and wall pressure.Moreover,the air concentration near sidewall is simulated by a mixture model.It is found that the mixture turbulence model is superior to the VOF turbulence model.Air entrainment is known to be one of efficient and inexpensive methods to prevent cavitation damages in hydropower projects.The shape of sudden expansion-fall is used as a common device for mitigating cavitation erosions.The complex flow patterns with cavitation are numerically simulated by using the realizable k-εturbulence model and the air-water mixture model.The calculated results are compared well with the experimental results as well as those obtained with the k-εturbulence model with the Volume Of Fluid（VOF）Model.The calculated results agree well with the experimental data for the aeration cavity and wall pressure.Moreover,the air concentration near sidewall is simulated by a mixture model.It is found that the mixture turbulence model is superior to the VOF turbulence model.

关 键 词：sudden expansion-fall aerator RNG k-εturbulence model realizable k-εturbulence model Volume Of Fluid （VOF）method air-water Mixture turbulence model numerical simulation 

分 类 号：O357.5[理学—流体力学] TU457[理学—力学]