Which of the following designs is the most...

🔍 Key Concepts

• Different mechanical attachment methods used for turbine blades (retaining ring, fir‑tree, pinning, locking tab) • How stress distribution and vibration affect blade roots and rotor disks in high‑speed turbines • Why ease of replacement, resistance to fatigue, and secure locking are important for blade attachments

💭 Think About

• Which design gives the best distribution of stress at the blade root instead of concentrating it at one point? • Which attachment type is commonly used in modern high‑speed gas/steam turbines where thermal cycling and centrifugal forces are very high? • Which method allows secure holding of the blade while still permitting some flexibility and thermal expansion without damaging the disk or blade root?

✅ Before You Answer

• Compare which designs are best at handling high cyclic stresses and vibration without cracking the disk or blade root • Think about which design is standard in modern turbine engineering practice, not just acceptable in theory • Eliminate any design that mainly serves as a secondary locking or safety feature rather than the primary load‑carrying attachment

Which of the following designs is the most satisfactory method for attaching turbine blades to the rotor disk?

Retaining ring design.

Fir-tree design.

Pinning design.

Locking tab design.

🔍 Key Concepts

💭 Think About

✅ Before You Answer