Abstract
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 MTUT161
low-pressure–turbine blade with imposed sinusoidal rigidbody
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 partial
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.
