Einfluss Unterschiedlicher Paketierungen Auf Schwingungsverhalten und Verbundfaktoren von Dampfturbinen-Beschaufelungen (The Effect of Different Packagings on the Vibration Behavior and the Coupling Factors of Steam Turbine Bladin

摘要

The vibration behavior of turbomachine bladings is described, and the behavior of different kinds of coupled low pressure stages was experimentally investigated. Besides purely stationary flow conditions, conditions were also considered where pulsating flow fields or periodic angular momentum variations, introduced via the turbine rotor shaft, lead to resonances. Strain gages were fixed onto the blade surfaces to determine the resonance loading. It is demonstrated how a dynamic blade loading can be influenced at constant driving forces. In normal cases, a roundabout coupling reduces the resonance amplitudes to free blades, but even then, unacceptably high loading can occur. Suitable blade packaging can reduce the loading in a simple and efficient way.