掺气保护长度研究进展  

Research Progress on Protective Length of Aeration

作　　者：常银兵[1] 黄国兵[1] 王丽杰[2] 

机构地区：[1]长江科学院,武汉430010 [2]河海大学,南京210098

出　　处：《水利科技与经济》2012年第10期1-5,共5页Water Conservancy Science and Technology and Economy

摘　　要：水流强迫掺气是目前应用广泛且行之有效的防蚀措施,工程中常在可能发生空蚀破坏位置的上游段设置掺气设施来减免空蚀破坏。由于水流掺气浓度的沿程衰减作用,长直泄洪隧洞往往需设置多道掺气设施以达到过流面掺气保护作用。然而,如何准确地确定掺气保护长度仍然需要进行大量的研究和探索,如临界免蚀掺气保护浓度和掺气浓度沿程演变规律的相关研究等。Forced aerated flow is widely used and an effective measure to reduce cavitation erosion.And in project constructions,aerator facilities are often set up in the upstream of cavitation damage location to reduce cavitation erosion.Long straight spillway tunnel is often required to set up multi-channel aerator because of the attenuation of air concentration.But how to accurately determine the location of every aerator is still lack of systematic researches.Such as the research of protect concentration of free erosion and the along evolution of protect concentration.

关 键 词：泄洪洞 临界浓度 保护长度 掺气坎 衰减 

分 类 号：TV131.3+4[水利工程—水力学及河流动力学]