[讲座]关于英国华威大学工程365bet体育在线官网Prof Shengcai Li讲座的通知

365bet官网:2009-09-24浏览:1634设置

 

报告题目A New type of cavitation Triggered by boundary-layer turbulent Production 报告人:Prof Shengcai Li, School of Engineering, University of Warwick, UK

报告365bet官网:9月26日(周六)下午3:00

报告地点:365bet官网机械系机电研究所,液压楼四楼会议室

报告内容概况:

The Francis turbines (710 MW) of the Three Gorge Project are the world largest. They are developed by world leading manufactures (Alstom, GE and Voith-Siemens), reflecting cutting-edge technologies. However, all these turbines have developed an unusual pattern of damage neither identified nor reported before. This puzzled professionals around world. Li identified this new type of cavitation and now works to determine its mechanism which we know little currently.
The fact that this cavitation occurs on all prototype turbines but no cavitation was detected during model tests has raised a fundamental question to the turbine similarity laws. Fluid dynamic and metallurgical analysis suggests that this cavitation is triggered by the boundary-layer turbulent production; and the damaged (roughened) spot in turn trigger subsequent cavitation (damage) immediately down stream. This forms a sustainable dynamic process, resulting in long and equal-width stream-wise damage-strips with span-wise regularity reflecting the span-wise stochastic characteristics of turbulent production. Owing to the heat effect of cavitation, inter-granular corrosion takes place through sensitization process, leaving damage surface a corrosion appearance. Also, bluing presents at the damage tails owing to the nature of low-intensity damage. Extremely large turbines are much more susceptible to this type of cavitation (damage) owing to the scale-effect.

This phenomenon of highly multi-disciplinary nature presents a grand challenge to fundamental sciences as well as to development of modern turbines and other devices.

 

 
报告人概况:

 

Professor Shengcai Li, School of Engineering, Warwick University
 
Professor Li is an internationally renowned academic specialised in turbo-machinery and its cavitation phenomenon. He is the Leader of the Cavitation Research Group in the Civil and Mechanical Division of Warwick’s School of Engineering. Under his leadership, Warwick has now become an internationally renowned centre for cavitation studies. He is also an Executive Member of the International Research Centre of Hydraulic Machinery (Beijing); and the Series Editor of the book series of hydraulic machinery and the Editor & Co-author of the first title ‘Cavitation of Hydraulic Machinery’. He has been listed in the Who’s Who of Science Engineering since 2003 and the Who’s Who in the World since 2008.
 
Prof Li started his career as a research engineer in later 1960’s at the Ministry of Water Resources and Electricity, China, where he developed the novel concept of double-row cascade runner for high performance hydraulic turbines and the first generation of semi-conductor dual-control governor BDT-100 for Kaplan turbines. He was among the first group of Chinese scientists selected in 1978 for working in abroad. Since later 70’s he guided his research into fundamental phenomena of cavitation, discovering a phenomenon named as Cavitation Resonance while working at the Cavitation & Multiphase Flow Lab, University of Michigan in USA. He also established a hydraulic turbine lab for cavitation research in China in 1980’s and recently a novel cavitation research lab at the Warwick University.
 
 
李胜才教授英国华威大学工程365bet体育在线官网。他从事水轮机空蚀与机理研究40年,在空泡机理和抗空蚀水轮机的研究方面做出了开拓性的工作。他是水力机械全书的主编。由他主编的’Cavitation of Hydraulic Machinery’(水力机械空化)一书于2001年出版以来获得了国际同行的广泛认同, 次被国际一级刊物的综述和评论文章引用并经常被指定为国际讲学班的参考书。由他主持的每三年一次的空化国际会议‘WIMRC CAVITATION FORUM’是透平机械空化的主要国际学术交流平台。
他的空化实验室中有EPSRC(英国工程与自然研究理事会)资助、自行设计、建成的新型空化试验装置, 共有博士后、博士生和硕士生十余人从事空化研究。他六十、七十年代在中国水电部从事研究和教学期间,开发了双列叶栅(也称为长短叶片或带副叶片)新概念转轮,并於1965年由哈尔滨大电机研究所吴新润所长主持在云峰电站十万千瓦混流机组上试验成功。这比八十年代从挪威‘Kvaerner’企业为鲁布革电站引进的双列叶栅转轮要早了整整二十年。他在六十年代未与一机部天津电气传动研究所孔照年(现在水电部水科院)等共同开发了中国第一代半导体双调电液调速器BDT-100型,样机在陆水电站投入运行近四十年无故障直至最近升级换代而退役。丰富的水电实践经验使他的基础理论研究总是紧紧围绕水力发电的重大技术关键,得益非浅。1978年他以河北省和水电部系统第一名考上改革开放第一批公派留美,在密西根大学发现的空化共振现象就源自於对水轮机尾水管内空化流引起的振动的研究实践

 

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