基于复合形法优化高水头球形岔管的体形

Optimizing High Head Ball Size of the Bifurcation Pipes Based on the Complex Method

球形钢岔管是最适合高水头电站的岔管形式,采用传统的规范设计准则,安全系数大,管壁厚度偏大,材料的强度得不到充分发挥。针对某高水头电站的球形岔管,采用复合形法对岔管的主体结构包括球壳、主支管过渡段和补强环的尺寸进行优化设计,减小了球壳及主支管过渡段的厚度,加大了补强环的宽度。同时采用ANSYS有限元软件对优化前后的岔管结构进行应力计算,各部位应力分布较均匀,均满足规范允许值;优化后各部位最大应力值略有增加,钢材强度得以充分发挥,球壳与主支管过渡段连接处变形量几乎为零,没有出现应力集中现象。为类似高水头球形岔管的设计提供参考,具有一定的工程实际意义。

Spherical steel bifurcation pipe is the most suitable for high head power stations of the bifurcation pipe forms, using the tra- ditional standard design criteria will cause the strength of the materials to get into full play and be in large safety coefficient and wall thickness. Based on a spherical bifurcation pipe of high head power station, and adopted the complex method to optimize the body of the bifurcation pipe, including the spherical shell structure, the main branch of transition section and reinforcing ring size, which re- duces the spherical shell and the tubes the thickness of the transition section and increase the width of the reinforcing ring. At the same time ANSYS finite element software to calculate the stress of the bifurcation pipe before and after the optimization and finding that each part stress distribution is more uniform and meets the specification value. Each part of the biggest stress value increases slightly after optimization and the steel strength is brought into full play. As the spherical shell and the main branch transition period of joint deformation is almost zero, there is no stress concentration phenomenon. This is similar to reference for the design of high head spherical bifurcation pipes and it has a certain practical significance.