Secondary flow effect on particle deposition in gas turbines

Project: Research-related funding


Project Objective
The objective of the current project is to evaluate the effects of particle ingestion and their deposition in gas turbines. Specifically, the interaction
of such particles with the secondary flows is investigated, aiming to understand the factors that increase or reduce the rate of adhesion of particles
on gas turbine aerodynamic surfaces. The study will be carried out on an HPT nozzle.
Scientific rationale
Particle ingestion in gas turbine is a severe problem for both aero-propulsion and land-based gas turbines. Indeed, such particle can stick or erode
the blades of the machines, reducing their performances up to engine shut-down. In the aeronautical field, the operation in harsh environment or
the flight through sand storms or volcanic ash clouds make the machine to ingest high amount of particulate, due to the absence of filtering systems. Filters, on the other hand, are installed in heavy-duty applications, but for a certain particle range (0.5 to 2 microns) their effectiveness
is not remarkably high (capture efficiency of the order of 70%). Furthermore, the usage of synfuels is responsible for increasing the particulate in
the air processed by the turbine.
For all these reasons, it is of paramount importance to better understand the mechanisms that can slow down the build-up or the erosion on the
Innovation potential
The proposed idea as an high innovation potential, considering the relevance of the problem and the fact that the solution the applicants are
studying would not impact the aerodynamic design or major variation on the machine layout. By being able to control some of the secondary flows
that arise during gas turbine operation, the deposition rate may be reduced, extending the working life of the machine.

Key findings

Big Data, Fouling
Short title400000 Core Hours
Effective start/end date1/11/191/10/20