Session: 40-05: Turbine Cavity Flows and Flowpath Geometry Effects II

Paper Number: 152949

Experimental Investigation of the Energy Distribution Among Turbulence Through Proper Orthogonal Decomposition Inside an Annular Turbine Exit Guide Vane Cascade With Purge Cavity Air 

The thermal efficiency of jet engines increases with enhanced combustion exit temperatures. Consequently, the fluid's total temperature downstream of the Low-Pressure Turbine (LPT) increases, too. Thus, a method is needed to prevent hot gas from entering the slot cavity between LPT's last rotor row and the stationary Turbine Rear Frame (TRF). As a result, cold air gets extracted from the Low-Pressure Compressor and purged into the slot cavity, which eventually enters the main gas path at the hub upstream of the TRF's Turbine Exit Guide Vanes (TEGV). Experimental data is recorded inside a high-speed wind tunnel downstream of a Turbine Exit Guide Vane cascade. The study presents findings on the energy distribution among turbulent characteristics of the flow field downstream of an annular Turbine Exit Guide Vane Cascade. Moreover, the impact of cavity air purged into the main gas path through a slot cavity upstream of the stationary cascade is considered. Fundamental cycle considerations yield a correction method to distinguish between various viscous work inputs. Constant Temperature Anemometry (CTA) is used for transient data acquisition and Proper Orthogonal Decomposition (POD) is utilized to identify the primary contributors in terms of energy. Three different operating conditions are investigated representing the aircraft states cruise, take-off and maximum climb.

Presenting Author: Giorgia Teresa Bozzo Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology

Presenting Author Biography: Giorgia Teresa Bozzo graduated with a master's degree in Energy and Aeronautical Mechanical Engineering from the University of Genoa.
Currently a PhD student in Mechanical Engineering at the Institute of Thermal Turbomachinery and Machine Dynamics at the Graz University of Technology.

Authors:

Giorgia Teresa Bozzo Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Malte Schien Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Asim Hafizovic Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Lukas Paier Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Andreas Koschu Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Emil Göttlich Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Robert Krewinkel Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Andreas Marn Institute of Thermal Turbomachinery and Machine Dynamics, Graz University of Technology