航空学报 > 1992, Vol. 13 Issue (10): 551-554

涡轮盘的破裂分析

饶寿期, 李纪安, 岳彦芳   

  1. 北京航空航天大学4系 北京 100083
  • 收稿日期:1991-11-01 修回日期:1992-02-01 出版日期:1992-10-25 发布日期:1992-10-25

FRACTURE ANALYSIS FOR TURBINE DISC

Rao Shou-qi, Li Ji-an, Yue Yan-fang   

  1. Fourth Department of Beijing University of Aeronautics and Astronautics, Beijing, 100083
  • Received:1991-11-01 Revised:1992-02-01 Online:1992-10-25 Published:1992-10-25

摘要: 某烟气轮机涡轮盘发生了盘缘断裂掉块事故,某航空发动机Ⅰ级涡轮盘也大量发生槽底裂纹的故障。我们对这两个盘的盘体和槽底部分用轴对称和平面8节点等参元有限元法对温度场(包括瞬态温度场)与应力场进行了计算,从而对涡轮盘在不同工作状态下的应力分布及故障原因进行了分析。本文着重阐述冷却条件对于涡轮应力分布是十分重要的,同时,不应忽视轮缘的应力水平,在某特定工作状态下,轮缘的应力值可能远远超过轮心,而且循环的应力幅值也很大,且由于载荷与几何形状的复杂性,在轮缘与榫齿的过渡段上出现较大的应力集中,往往成为裂纹源区;本文最后分析了轮缘残余应力形成及对槽底径向裂纹的生成与扩展的影响。

关键词: 涡轮盘, 破裂, 有限元

Abstract: In this paper, the fracture accident at the rim of turbine disc for an industrial gas turbine is calculated and analyzed. The temperature field and stress field under the normal state and the fracture accident state are calculated by using FEM in the disc body and the fir tree foot groove of turbine disc. The results of calculation show that effect of cooling fashion by air is very important for the stress distribution of turbine disc , and the stress state at the fir tree root of disc has severe influence on causing the fracture accident of turbine disc.

Key words: turbine disc, fracture, FEM