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以国外某抽水蓄能电站为例,基于Ansys有限元计算平台,利用流固耦合方法研究了电站可逆式水轮机转轮在不同水头下机组流道内的水体对转轮叶片的影响,通过计算预应力和干湿条件下的转轮模态,分析了水体和预应力对转轮振动频率的影响。结果表明,在不同水头水压力作用下,转轮的静应力最大值出现在上冠与叶片相连处,叶片最大变形出现在叶片出水边的中间位置,且随着水头的升高而增大;预应力对转轮模态的影响较小,而水介质因阻尼作用对转轮模态减小效果明显。
Taking a foreign pumped storage power plant as an example, based on the Ansys finite element calculation platform, the influence of water bodies on runner vanes of runner of reversing turbine of power station under different head is studied by means of fluid-solid coupling method. By calculating prestress And dry and wet wheel conditions, the impact of water body and prestress on the vibration frequency of runner was analyzed. The results show that under the different water head pressure, the maximum static stress of runners appears at the junction of the crown and the blade. The maximum deformation of the blade appears in the middle of the edge of the blade and increases with the rise of the water head. The effect of prestress on runner modal is small, while the effect of water medium on runner modal reduction is obvious due to damping effect.