摘要
通过分析直叶片传统设计流程中的不足之处,借助程序编写,改变直叶片的设计流程,把设计流程末端的强度校核改为强度计算,并放置在流程的最前端。把依据结构设计尺寸的强度校核改为由强度计算确定结构尺寸。通过编写程序操控作为中转站及叶片数据库的excel表格,实现叶片的快速设计计算及查询。直叶片设计完成后,由编写的程序驱动三维软件,完成直叶片的三维参数化模型的创建。叶轮强度采用二次算法,把叶轮轮体划分为十二段,并推导出每段内外直径及宽度与叶轮外形结构数据之间的数学表达式。根据所推导的公式,利用VB语言编写叶轮应力及过盈量的计算程序,并把叶轮的外形结构数据输入到叶轮数据库中,同时查找数据库中有无相同结构尺寸的叶轮,以避免叶轮的重复设计。叶片的叶根装于叶轮的叶根槽中,叶片的强度计算涉及到叶轮的轮缘尺寸,叶轮强度计算中的径向外载荷主要来源于叶片的离心力,在强度计算过程中,两者之间相互关联。以相互关联的内容为纽带,把两者的强度计算整合为一体,极大的简化整了个计算过程。引入excel表格作为数据库,采用二次开发技术,利用VB编程,把叶片、叶轮强度计算、数据及叶片三维建模融为一体,实现汽轮机直叶片及其叶轮一体化设计计算。
By analyzing the shortcomings of the traditional design process of straight blade,with the help of programming,the design process of straight blade is changed,and the strength check at the end of the design process is changed to strength calculation,which is placed at the front of the process.The strength check based on the structural design size is changed to the strength calculation to determine the structural size.By programming and controlling the excel table as the transfer station and blade database,the rapid design,calculation and query of blades are realized.After the straight blade design is completed,the written program drives the three-dimensional software to complete the creation of the three-dimensional parametric model of the straight blade.The impeller strength adopts the quadratic algorithm,divides the impeller body into twelve sections,and deduces the mathematical expression between the inner and outer diameter and width of each section and the impeller shape and structure data.According to the deduced formula,the calculation program of impeller stress and interference is written in VB language,and the shape and structure data of the impeller is input into the impeller database.At the same time,it is necessary to find out whether there are impellers with the same structure size in the database,so as to avoid repeated design of the impeller.The blade root of the blade is installed in the blade root groove of the impeller.The strength calculation of the blade involves the rim size of the impeller.The radial load in the strength calculation of the impeller mainly comes from the centrifugal force of the blade.In the process of strength calculation,the two are interrelated.Taking the interrelated contents as the link,the strength calculation of the two is integrated into one,which greatly simplifies the whole calculation process.The excel table is introduced as the database,the secondary development technology is adopted,and the VB programming is used to integrate the blade and impeller strength calculation,data and blade three-dimensional modeling,so as to realize the integrated design and calculation of steam turbine straight blade and its impeller.
作者
张海林
贾丹
朱曙光
ZHANG Hailin;JIA Dan;ZHU Shuguang(Luoyang Zhongzhong Power Generation Equipment Co.,Ltd.,Luoyang,He’nan,471003,China)
关键词
汽轮机
直叶片
三维参数化模型
套装叶轮
过盈量
二次算法1
绪论
steam turbine
straight blade
three dimensional parametric model
suit impeller
interference
quadratic algorithm
introduction
