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为了分析压力脉动及其诱发的结构振动等不稳定问题,对大型水轮机在不稳定条件下的流固耦合算法进行了研究。建立了非定常条件下耦合问题的控制方程及其定解条件,探讨了耦合界面模型在耦合分析过程中的作用,提出了一种适合于大型水轮机不稳定压力场与结构场耦合分析的界面模型,分析了以求解转轮区压力脉动为主要目标的非定常湍流计算模式。结合某大型电站,建立了原型水轮机非定常耦合计算模型,详细给出了转轮区不稳定压力场的分布特征,为下一步开展结构动态响应分析奠定了基础。
In order to analyze the instability problems of pressure pulsation and its induced structural vibration, the fluid-solid coupling algorithm of large turbines under unstable conditions was studied. The governing equation and its solution conditions for the coupled problem under unsteady conditions are established. The function of the coupled interface model in the coupling analysis process is discussed. An interface model suitable for the coupling analysis of unsteady pressure field and structural field of large hydraulic turbine is proposed , The unsteady turbulence calculation mode with the main aim of solving pressure pulsation in the runner zone is analyzed. Combined with a large power plant, the unsteady coupling calculation model of prototype turbine is established, and the distribution characteristics of unsteady pressure field are given in detail, which lays the foundation for the next step to carry out structural dynamic response analysis.