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以新疆某水电站高压岔管为例,采用三维有限元法,研究了岔管初拟体型方案及管壁厚度,对初拟体型方案进行了优化,选取较为合理的岔管体型及管壁厚度,计算了岔管及肋板初拟方案和优化方案关键节点应力,并绘制优化后最终体型的肋板及岔管应力云图。结果表明,优化后体型采用较薄壁厚,肋板应力提高,管壳应力降低,更好地发挥了肋板的作用,体型较为合理;优化后其应力值均在允许应力范围内,且有一定裕度,表明岔管体型设计及壁厚选择较为合理,较为真实地反映了岔管运行期的应力状态。
Taking the high-voltage bifurcation pipe of a hydropower station in Xinjiang as an example, the initial bifurcation plan and wall thickness of the bifurcated bifurcation were studied by using the three-dimensional finite element method. The initial bodyshort plan was optimized, the reasonable bifurcation body shape and wall thickness were selected, Calculate the key node stress of the initial plan and optimization scheme of the bifurcated pipe and the rib, and draw the stress cloud of the rib and bifurcation of the optimized body shape. The results show that the optimized body shape is made of thinner wall thickness, the stress of the rib plate is increased, the stress of the shell tube is reduced, the effect of the rib plate is better, and the body shape is more reasonable. The optimized stress value is within the allowable stress range, Degrees, indicating bifurcated body design and wall thickness more reasonable choice, a more real reflection of the bifurcation of the stress state.