Influence of blade vibrations on aerodynamic performance of axial compressor in gas turbine: Direct numerical simulation

Flutter instability because of the blade vibrations is a major problem in axial compressor cascades. This paper investigates effects oscillations on aerodynamic performance and turbulent flow characteristics modern gas-turbine compressors. Highly accurate direct numerical simulations (DNS) are performed based spectral-hp element method to predict instabilities, pressure fluctuations vortex generation surface blades by considering all complex physical parameters at different vibration frequencies (0 < f 8.28 Hz). The main novelty this study consider aeroelastic DNS analysis. novel proposed enables detailed analysis structure fluid interactions, which cannot be obtained using other methods such as RANS models. revealed that have huge impact laminar separation bubble suction side blade. Moreover, amplitude unsteady distribution greater 90% span, with phage angle deviating between 100° 350°. Strong observed centre wake region vibrating cascade. These activated disturbances resulting from oscillation. intense happen oscillating compared stationary one. separating point occurred 8.28% sooner k = 0.4 (X sep /C 0.288) X 0.314. • over studied. Separation faster Oscillations LSB Additional disturbance detected due higher frequencies.