大型水电站厂房结构流固耦联振动特性数值模拟

NUMERICAL SIMULATION OF LARGE-SCALE POWERHOUSE STRUCTURES ON FLUID-SOLID INTERACTION VIBRATION CHARACTERISTICS

水电厂房内的多场耦合振动分析是工程界十分关心的问题.为了实现发电厂安全生产的目标,过去在对其进行共振校核时,往往只对结构进行模态分析,而忽略了流体的存在;但是厂房流道内存在着大量的流体,流体的存在改变了厂房结构的动力特性,是属于典型的流固耦合振动问题.因此,在对其进行共振校核时应该考虑流体的影响.由于机理的复杂性、建模、数值模拟的困难性,迄今为止关于这方面的分析研究成果很少.本文借助于2个实际工程,对厂房结构与流体复杂的耦合振动问题进行分析,并对其进行比较,详细的阐述了厂房结构-流体的耦合振动特点.本文的研究成果对于解决流体-结构相互作用问题具有重要的工程意义,同时对于解决其他类型的流固耦合振动问题也具有很高的参考价值.

Multi-fields coupling vibration analysis is paid attention to in engineering field. In order to carry out the safety in production, the modes of a structure are only analyzed when resonance vibration check is done regardless of the fluid. But the characteristics of structure are changed because of the large scale of fluid in flow passage, and it is the typical fluid-solid interaction problem. When resonance vibration check is done, the fluid having an effect on the structure should be considered. So far the research findings concerned are few because of the complexity of the mechanism and difficulty of the modeling and numerical simulation. The two engineering examples are used in this paper, the coupling vibration analysis is done, and also the comparison is analyzed, the vibration characteristics are expatiated particularly. The research findings are of important significance for solving FSI problems, and they are of high vahm for solving other FSI problems.