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本文通过对岩滩电站楼板强振原因和转轮裂纹的分析,针对岩滩电站的具体情况,通过采用负倾角叶片、增加叶片数、降低模型转轮最优单位转速和CFD分析等减振措施的应用,优化设计了A773a转轮用于岩滩电站减振改造。通过模型试验判断该转轮用于岩滩电站可以消除岩滩电站楼板强振;有限元分析结果可知消除了叶片裂纹;真机半年的运行和试验证明楼板强振消除。另外岩滩电站减振成功改造可以对其它大型机组的振动和裂纹问题提供借鉴和参考。
Based on the analysis of the strong ground vibration and the crack of runner in Yantan Power Station, aiming at the specific conditions of Yantan Hydropower Station, by adopting negative inclination blades, increasing the number of blades, reducing the optimal unit rotation speed and CFD analysis of model runner, The application of A773a rotor was optimized to reduce the vibration of Yantan hydropower station. Through the model test, it can be concluded that the runner used in Yantan hydropower station can eliminate the strong vibration of the floor of Yantan hydropower station. Finite element analysis shows that the blade crack is eliminated. The operation and test of real machine for half a year prove the strong vibration elimination of the floor. In addition, the successful reconstruction of the Yanshun Hydropower Station can provide reference and reference for the vibration and cracking problems of other large units.