抄録
The purpose of the study is to investigate high speed turbomachinery system stability. Unstabilizing force due to Thomas force induced by turbine is reduced system damping of critical speed. In this paper, high-speed turbomachinery system is modeled using FEM, and natural frequency and damping ratio are calculated by complex eigenvalue analysis, using the double QR method. For estimating unstabilizing force, torque generated by turbine blade is calculated by CFD, and calculated cross coupling stiffness from torque. System damping is reduced by cross coupling stiffness from complex eigenvalue analysis results.
