Profile Aerodynamics of an Oscillating Low-Pressure–Turbine Blade

This paper presents an analysis of the vibration-induced effects on the aerofoil aerodynamics and boundary-layer development of a low-pressure–turbine blade. Large-eddy simulations of an MTU-T161 low-pressure–turbine blade with imposed sinusoidal rigid-body oscillations were conducted for frequencies of 50 and 100 Hz as well as for a fixed reference blade. The oscillations are shown to impact both the time-averaged flow field and unsteady velocity fluctuations. These changes appear most markedly as a reduction in the stagnation-point pressure and a par-tial suppression of the separation bubble on the suction side of the aerofoil. The results suggest that the deterministic velocity fluctuations introduced by the oscillating blade promote transition on the suction side and expedite the generation of turbulence. is presented for the investigation of vibration-induced effects on the aerofoil aerodynamics and boundary-layer development of low-pressure–turbine blades. To achieve this goal, large-eddy simulations of an MTU-T161 LPT profile with imposed sinusoidal rigid-body oscillations are analysed. The oscillations are shown to impact both the time-averaged flow field and the unsteady fluctuations. use of periodic boundary conditions normal to the blade motion and allows the study of oscillation-induced effects on the profile boundary layer.