Session: 36-01 Deposition and Erosion Effects

Paper Number: 81715

81715 - Particle Deposition on HPT Nozzle: Full 3D Investigation and Secondary Flows Effect 

Gas turbines can operate in an environment that is dispersed with particles. Such particles, if ingested by the machine, have a detrimental effect as they can deteriorate the aerodynamic surface they impinge on. Deposition and erosion are the typical phenomena that occur, causing an uncontrolled variation in the blade shape. Such evolution reflects in performance variation at the point that elevate deposition rate can cause the failure of the engine. Even if this risk is present both in heavy-duty machines and jet-propulsion engines, it is particularly hazardous in aero-engine applications. 
The aim of this work is to gather information about how adhesion mechanism is influenced by geometrical features of gradually growing complexity. At this scope,  the particle deposition problem is investigated from the numerical standpoint. Specifically, the LS-89 transonic high pressure turbine (HPT) vane is simulated and an encounter with a volcanic ash cloud is modelled. Three simulations are carried out: a 2D simulation has been compared with the set of 3D simulations. Different levels of complexity of the geometry have been considered for the 3D case: the endwall effect has been assessed considering the presence of a variable radius fillet and comparing it with the prediction obtained by a cylindrical extrusion. The proposed analysis provides indications on the 2D and 3D prediction with regards to particle deposition problems. The sticking pattern of the particle has been investigated in relation to the different nature of secondary flows.

Presenting Author: Stefano Oliani University of Ferrara

Presenting Author Biography: Stefano Oliani is a Ph.D. student. He studied Mechanical Engineering at the University of Ferrara, obtaining his Bachelor’s degree in 2017 and his Master’s degree in 2019. In November 2019 he started the Ph.D. activities. His research efforts are mainly focused on the numerical study of turbomachinery operating in deteriorated conditions and unsteady flow simulations in axial turbines.

Authors:

Nicola Casari University of Ferrara
Stefano Oliani University of Ferrara
Michele Pinelli University of Ferrara
Alessio Suman University of Ferrara
Mauro Carnevale University of Bath