Profile Aerodynamics of an Oscillating Low-Pressure–Turbine Blade

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 MTU-T161 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.

Computational Fluid‐Structure Interaction towards Simulating Large Wind Turbines with openFOAM and deal.II Coupled via preCICE

“…For simulations of the interaction of a fluid and a solid, there is a one-way (weakly coupled) approach or a two-way (strongly coupled) approach. In a one-way or weakly coupled FSI, the deformation of the solid domain is imposed as a rigid body motion [12,13] or the computational fluid dynamics (CFD) mesh is deformed with pre-calculated deflections from a solid solver. In these cases, the motion or deformation of the solid domain has to be known a priori of the simulation.…”