以周向拉杆转子为研究对象，考虑拉杆凸台与拉杆孔之间的接触，建立1/24循环对称有限元模型。采用顺序耦合方法对转子冷态启动过程进行热固耦合分析，得到转子的瞬态温度场、应力场。以第5，17级轮盘为观察对象，对比发现拉杆凸台与拉杆孔间的紧密接触是第5级轮盘拉杆孔上壁面处应力较高的原因，较高的温度梯度是第17级轮盘圆角处、拉杆孔侧壁面处应力较高的原因。据此提出启动曲线优化方案，优化后转子启动过程中的最大应力显著降低。结果表明可以通过优化启动曲线有效降低轮盘内部温度梯度，进而降低转子的热应力，而调整启动曲线对拉杆凸台与拉杆孔之间的接触应力影响不大。
Taking a circumferential distributed rod fastening rotor as the research object, considering the non-linear contact between rod shoulders and rod holes, a 1/24 cyclic symmetry model was established through finite element method. Sequence coupling method is applied to investigate transient temperature and stress distribution of rotor under cold start-up condition. Intense contact between rod shoulder and rod hole results in high stress at 5th disc rod hole top surface, high temperature gradient caused high stress at 17th disc wheel rim fillets and rod hole side surface. By applying optimized start-up curve, the maximum stress of rotor under start-up condition was significantly decreased. Results showed that high thermal stress caused by temperature gradient could be lower by optimizing the start-up curve; whereas adjusting the starting curve has little effect on the contact stress between tie rod shoulder and rod hole.
2022,44(11): 125-131 收稿日期：2021-07-15
DOI：10.3404/j.issn.1672-7649.2022.11.026
分类号：U664.131
作者简介：周祚(1991-)，男，硕士，助教，主要研究方向为燃气轮机转子结构强度仿真，热应力分析，瞬态应力分析，拉杆形变分析。
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