Blisks are single engine components that combine a rotor disk and blades into one piece, either through casting, machining, or welding. Blisks replace separate disks and blades in turbomachinery. They provide advantages such as eliminating the need to attach blades to disks, decreasing the number of components, reducing drag, and increasing compression efficiency. Additionally, removing the dovetail attachment of traditional blades eliminates a common source for cracks to form.

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18. BLISK FAN
• A blisk is a single engine component consisting of a rotor disk
and blades, which may be either integrally cast, machined from
a solid piece of material, or made by welding individual blades to
the rotor disk. The term is used mainly in aerospace engine
design. The word is a combination of blade and disk, the two
components it replaces in turbomachinery. Blisks may also be
known as integrally bladed rotors (IBR).

19. ADVANTAGES
• Instead of making bare compressor disks and attaching the
blades later on in the process, blisks are single elements
combining the two. This eliminates the need to attach the
blades to the disk (via screws, bolts, etc.), thus decreasing the
number of components within the compressor, while at the
same time decreasing drag and increasing efficiency of air
compression within the engine. In addition, the removal of the
dovetail attachment found on traditional turbine blades
eliminates a common source for crack initiation and
subsequent propagation.