在低水头电站中,机组段平面尺寸通常取决于混凝土蜗壳的轮廓尺寸,而蜗壳的详细尺寸必须由水轮机工厂通过模型试验给定。但是,在水电站厂房的初步设计中,一般要根据蜗壳外形的主要尺寸来决定厂房平面的大小。因此如何比较正确而又迅速地确定各种不同断面型式混凝土蜗壳的外形尺寸,对提高设计劳动生产率具有现实的意义。 In low head stations, the plane size of the unit section usually depends on the profile size of the concrete volute, while the detailed dimensions of the volute must be given by the turbine plant through a model test. However, in the preliminary design of hydropower plant, it is generally necessary to decide the size of the plant floor according to the main dimensions of the volute shape. Therefore, it is of great practical significance to improve the design productivity of labor by how to determine the external dimensions of various types of concrete volute more accurately and quickly.