46. Why are loose-fitting blades used on the first several stages of large axial compressors?

Loose-fitting blades in the first stages of large axial compressors minimize vibration during operation through critical speed ranges. The looseness allows blades to shift slightly, dampening vibration and reducing stress, particularly in long blades prone to resonant vibration. This design feature is a preventive measure against vibration, not a solution for bearing failure, blade tip wear, or maintaining tight tolerances.