Conical Disk

Abstract

Turbine disks frequently employ so-called conical profiles (also referred to as biconical), i.e., profiles whose thickness varies with the radius according to a linear function h = h(r). This is because these profiles are easier, and thus less costly, to produce than the corresponding hyperbolic disks, uniform strength disks or disks whose thickness varies according to a power of a linear function such as (7.12), which will be discussed below in Chap. 7. As was mentioned in Chap. 4, (4.1) which defines Stodola’s hyperbolic profile can also be used to describe the profile of an annular disk which diverges according to a linear function from the inner to the outer radius, or in other words, the diverging conical annular disk. In this case, (4.1), (4.2) and (4.3) will have a = 1 and C = h _e /r _e = h _i /r _i , and thus h _i /h _e = r _i /r _e = β.