(1) Rotor Dynamics Group, Korea Institute of Machinery and Materials, 305-600 Daejeon, Korea;(2) Gas Turbine Department, Leningradsky Metallichesky Zavod, Baskov 26, 191914 St. Petersburg, Russia
Abstract:
In this paper are presented the blade vibration characteristics at the starting conditions of the low pressure multistage
axial compressor of heavy-duty 100 MW gas turbine. Vibration data have been collected through strain gauges during aerodynamic
tests of the model compressor. The influences of operating modes at the starting conditions are investigated upon the compressor
blade vibrations. The exciting mechanisms and features of blade vibrations are investigated at the surge, rotating stall,
and buffeting flutter. The influences of operating modes upon blade dynamic stresses are investigated for the first and second
stages. It is shown that a high dynamic stress peak of 120 MPa can occur in the first stage blades due to resonances with
stall cell excitations or with inlet strut wake excitations at the stalled conditions.