转子寿命计算中的应变集中系数

• 作 者: 魏先英 杜怡宾
• 出 处: 动力工程
• 发表日期: 1986年04期
• 关键词: 转子寿命 热应变 调节级 高压转子 圆弧半径 弹塑性有限元法 改型设计 弹性区 危险截面 计算对象

本文用弹塑性有限元法.对上汽厂30万千瓦汽轮机高压转子的最危险截面——调节级后过渡圆弧段进行了计算.计算结果表明:过渡圆弧半径从R3改为R20,最大当量应变即能降低17%～25%,热应变集中系数能降低18%～26%,转子寿命可延长两倍左右.对汽封弹性槽计算的结果表明:将原来设计的单圆弧弹性槽改为三圆弧弹性槽,热应变及热应变集中系数均可明显下降.本文的计算结果己用于上汽厂30万千瓦汽轮机的改型设计.

In this paper, elastic-plastic finite element method was used to calculate the most dangerous cross-section of the high-pressure rotor of the 300 MW steam turbine in SAIC. The results show that the radius of transitional arc is changed from R3 to R20, the maximum equivalent The strain can be reduced by 17% -25%, the thermal strain concentration coefficient can be reduced by 18% -26%, and the rotor life can be prolonged by about 2. The calculation results of the elastic seal of the gland seal show that the original design of the single- For the three arc elastic grooves, the thermal strain and the thermal strain concentration factor can both be obviously decreased.The calculation results of this paper have been used in the retrofit design of 300 MW steam turbine of SAIC.