烟机叶轮的计算模型研究与强度分析

A Strength Analysis and Model Investigation of the Flue Gas Turbine Blade

烟气轮机结构设计的关键是准确计算叶轮强度。采用数值模拟仿真的方法,通过有限元软件ABAQUS计算叶轮强度,计算内容包括叶轮的动静强度。物理模型选取叶轮的1/66,静强度计算结果显示最大应力发生在叶身底部背弧的中心位置,这与实际运行现场发生断裂故障一致,说明进行叶轮的静强度有限元数值计算时在保证网格质量的前提下必须考虑叶根与榫槽接合面之间非线性接触效应,而且接触部位的网格需用六面体网格。动频数值计算时,分别对2种约束形式下的模型进行计算,结果表明固定叶根情况下动频与考虑接触效应动频之间的差异主要体现在一阶模态上。强度分析表明该型号烟机的叶轮强度满足要求,对烟机叶轮的叶型设计具有指导意义。

How to compute the blade strength correctly is important to design a flue gas turbine. A three-dimensional numerical simulation of the flue gas turbine blade is performed by using finite element software ABAQUS. The computation model of the flue gas turbin blade is 1/66 of the whole geometry. Nonlinear contact between blade＇s tenon and disk＇s groove subjected to centrifugal loads is considered in the computation model. Static strength results show the max-stress appears at the middle of the blade＇s convex profile, which simulates correctly the crack of the running blades. Elements near contact surface are hexahedron elements. Two constrain conditions can get different results for dynamic frequency, which mainl frequency. The computation shows this flue gas turbine＇s blade streng design. y occur at the first-order th meets the standard of