EFFECTS OF ENTRAINED AIR MANNER ON CAVITATION DAMAGE

作     者：WU Jian-hua LUO Chao WU Jian-hua,LUO Chao College of Water Conservancy and Hydropwer Engineering,Hohai University,Nanjing 210098,China

作者机构：College of Water Conservancy and Hydropwer Engineering Hohai University Nanjing 210098 China 

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

年 卷 期：2011年第23卷第3期

页      面：333-338页

核心收录：

学科分类：081504[工学-水利水电工程] 082903[工学-林产化学加工工程] 08[工学] 0829[工学-林业工程] 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）] 0802[工学-机械工程] 082201[工学-制浆造纸工程] 0701[理学-数学] 0822[工学-轻工技术与工程] 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：supported by the National Natural Science Foundation of China (Grant No.50879021) the National Science Fund for Distinguished Young Scholars (Grant No.50925932) the Ministry of Science and Technology of China (Grant No.2008BAB19B04) 

主　　题：air entrainment air pressure air tube area cavitation damage entrained air manner 

摘      要：Early in 1953 the experiments by Peterka proved that air entrainment has effects on decreasing cavitation damage. This technology has been widely used in the release works of high dams since the inception of air entrainment in the Grand Goulee Dam in 1960. Behavior, mechanism and application of air entrainment for cavitation damage control have been investigated for over half century. However, severe cavitation damage happened due to complex mechanism of air entrainment. The effects of air entrainment are related to many factors, including geometric parameters, hydraulic parameters and entrained air manners. In the present work an experimental set-up for air entrainment was specially designed, the behavior of reducing cavitation damage was experimentally investigated in the three aspects of entrained air pressure, air tube aera and air tube number. The results show that magnitude of reduction of cavitation damage is closely related to the entrained air tube number as well as entrained air pressure, air tube aera, and that the effect through three air tubes is larger than that through single air tube although the entrained air tubes have the same sum of tube aera, that is, 1 ＋ 1 ＋ 1 〉 3. Therefore, it is important to design an effective manner of air entrainment.