SELF-EXCITED VIBRATION IN HIGH-PERFORMANCE TURBOMACHINERY.
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Instabilities impose a continuing restraint on the performance capabilities of turbomachinery and continue to cause difficulties in the design and operation of high-performance turbomachinery, particularly because the underlying causes are exacerbated by design trends to higher loadings, lighter weight, higher speeds, and closer clearances between static and rotating parts. Synchronous versus subsynchronous motion, internal rotor damping, hydrodynamic bearings, labyrinth seals, liquid seals for pumps, blade/aerodynamic interaction forces, and fluid trapped in rotors are discussed. Diagnostic methods and design approaches to avoid problems are included.
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