TRT蜗壳结构特性的有限元数值模拟

摘要

Stress and deformation of a welded TRT volute by static load and water pressure were stimulated initially with the method of elastic--plastic finite element method. The results show that the function of the whole volute's stress value in the static load is not big. The greatest stress is 19.1MPa and in terms of constraint place the maximum equivalent stress is mainly concentrated. The maximum displacement is 0. 0776mm in the whole volute and, it appears in lower shell in supporting pole. In water pressure test, the whole volute stress value is all between 40 to 85MPa, only local small --scale is reached 382MPa. Under the action of water pressure, maximum overall displacement of the whole cabinet appears on export baffle, and the value is 1. 511mm. Deformation in the volute is not remarkablemaximum displacement is 0. 0776mm in the whole volute and, it appears in lower shell in supporting pole. In water pressure test, the whole volute stress value is all between 40 to 85MPa, only local small --scale is reached 382MPa. Under the action of water pressure, maximum overall displacement of the whole cabinet appears on export baffle, and the value is 1. 511mm. Deformation in the volute is not remarkable.%采用弹塑性有限元方法,对静力载荷及水压试验条件下的TRT焊接蜗壳的应力和变形进行了数值模拟。结果表明,在静力载荷作用下,机壳整体最大等效应力仅为19.1MPa,主要集中在法兰上施加约束的位置;最大合位移为0.0776mm,出现在下机壳支撑柱处。水压试验过程中,机壳整体的等效应力值大部分在40～85MPa之间,仅局部小范围达到382MPa;壳体的整体合位移最大值为1.511mm,出现在出口挡板处,而机壳本身的变形并不显著。