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通过对轴流式水轮机全流道内流场进行13个稳定运行工况的非定常流场计算,得到不同工况下转轮桨叶表面非定常水压力载荷,并利用顺序流固耦合方法对桨叶在各种工况下的动应力特性进行计算分析。结果表明:在下游水位下降、机组水头升高时,机组在小功率工况下水力稳定性变差;同时表明机组长期在高水头小功率条件下运行时,由于水压力脉动引起的较大动应力是造成桨叶微裂纹的主要原因。计算结果可为水轮机其他零部件的应力特性及疲劳裂纹分析提供参考。
Through the unsteady flow field calculation of 13 stable operating conditions in the full flow field of an axial-flow turbine, the unsteady water pressure on the surface of the rotor blades under different conditions is obtained. By using the method of fluid-solid coupling, The dynamic stress characteristics of leaves under various working conditions are calculated and analyzed. The results show that when the downstream water level declines and the head of unit increases, the hydraulic stability of the unit deteriorates under the condition of low power. At the same time, it indicates that when the unit operates under high head and low power condition for a long time, Stress is the main cause of blade micro-cracks. The results can provide reference for the stress characteristics and fatigue crack analysis of other components of turbine.