圆形烟风道支座与加固肋匹配特性

Study on matching property of supports and stiffeneron circular exhaust duct

采用有限元数值计算的方法,对圆形烟风道的鞍式支座与环形加固肋的匹配问题进行分析,确定了鞍式支座与加固肋的最优匹配方式。试验结果表明:单纯使用鞍形支座,容易导致道体和支座接触区域的应力集中,最大应力值远超许用应力;在支座附近设置重肋,可以有效降低形变并提高屈曲系数,但是难以降低最大应力。将支座设置在重肋下方,不仅可以大幅度降低形变,屈曲安全系数也最高,同时能够大幅度减小支座与加固肋接触区的应力,可以满足长期使用的安全性要求。支座包角对应力集中和屈曲特性的影响较小。

The matching property of saddle support and stiffener on circular exhaust duct was studied,and the optimal position of heavy stiffener and saddle supports were determined by the finite element method（ FEM）. The results showed that the use of pure saddle supports might lead to stress concentration on the contact area of saddle and duct,meanwhile the maximum stress could exceed the allowable stress. The heavy stiffener near the supports could decrease the deformation and increase the buckling factor,while could hardly decrease the maximum stress. Saddle supports under the heavy stiffener could obviously decrease the deformation and increase the buckling factor,and could decrease the stress on the contact area of support and duct so that would meet the need of long-term security. The influence of wrapangle to the stress concentration and buckling property was not obvious.