TRT蜗壳稳态运行特性的数值模拟

通过有限元的方法,对大型TRT蜗壳式焊接机壳在热稳态运行条件下的温度场、应力场以及变形场的分布情况进行了数值模拟。计算结果表明,整个TRT蜗壳在热稳态运行条件下,机壳由于温度载荷的作用产生了热膨胀,机壳上的等效应力值均不大,大部分区域应力在100 MPa以下,在上机壳筋板附近,等效应力值比较集中,筋板上的等效应力值在70 MPa左右,最大值为117 MPa,出现在筋板的局部尖角处。整个机壳最大等效应力为168 MPa,远小于其屈服强度,因此满足强度要求。整体机壳的轴向收缩量较大,机壳在排气室与端板处收缩1.711 mm,变形并不大。因此,在稳态运行过程中,蜗壳的刚度足够。

Numerical Simulation of TRT Volute Steady-state Operation Characteristics

The temperature filed,residual stress field and deformation filed of TRT volute were stimulated using the finite element method under the condition of the hot steady-state operation.The results show that the equivalent stress of the whole TRT volute is not big when temperature load caused thermal expansion.Most of the region is below 100 MPa.The equivalent stress is concentrated and is about 70 MPa,and a maximum of 117 MPa appeares in the steel plate local pointed place.The whole TRT volute maximum equivalent stress is 168 MPa which is far smaller than the yield stress,so it meets the required strength.The axial contraction of TRT volute is in large quantities which contract in 1.711 mm in the exhaust room and board.Contraction deformation is not great.Therefore,in the steady-state operation process,the stiffness of TRT volute is enough.