学术
摘 要:
近年来，国内一些大型混流式转轮出现了不同程度的裂纹问题，对机组安全运行构成了威胁。研究表明，水力激励引起的混流式水轮机转轮叶片动应力是引起叶片疲劳破坏的主要原因之一。文中首先对高水头小负荷的涡带工况下混流式水轮机内流场进行非定常CFD计算，得到涡带工况下叶片表面不同时刻的水压力载荷，并利用流固耦合方法对转轮进行结构场瞬态特性计算，分析转轮叶片的动应力特性。结果表明由于水压力脉动引起的转轮叶片上的振动交变动应力是混流式水轮机疲劳破坏的主要原因之一。计算结果可为其它水轮机转轮的动应力特性分析和疲劳分析提供参考。[著者文摘]
文章出处:
《水力发电学报》-2007年26卷4期,140 -130-134,140页
分 类 号:
文献标识码:
A
Dynamic stress analysis of Francis turbine with partial load
XIAO Ruofu, WANG Zhengwei, LUO Yongyao （ Department of Thermal Engineering, Tsinghua University, Beijing 100084）
Abstract:
Fatigue and cracks occur in many large-sized turbines after they are put into operation. Researches show that high dynamic stress caused by hydraulic loads is the most important reason of the fatigue and cracks of the runner. The transient CFD simulation including the spiral case, stay vane, guide vane, runner vane and draft tube at different operation points is studied firstly, then the result of the pressure distribution on runner blade is provided for the runner transient structural simulation by fluid-structure interaction （FSI） method. The result indicates that the dynamic stress caused by hydraulic pulse at partial load is one of the important reason of the fatigue and cracks of the runner. All of that will help us to analyze the fatigue and fracture of hydraulic turbine runner.[著者文摘]
Key words:
hydraulic turbine ; CFD ; FSI ; dynamic stress analysis
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