Session: 13-01: Heat transfer in turbines engine testing

Paper Number: 153262

Heat Transfer Measurements in a Turbine Centre Frame at Realistic Mach Number – Part 2: Influence of Combustor Hot Streaks 

This paper investigates heat transfer in a Turbine Centre Frame (TCF), focusing on the effects of combustor temperature non-uniformities, more commonly referred to as hot streaks (HS). It is a continuation of earlier experimental research that analyzed the impact of HS on the duct's aerodynamics. The present study now extends the research to heat transfer, addressing the previously identified need to better understand the adiabatic wall temperature distribution and the heat transfer coefficient (HTC). Part 1 of this work provides a detailed explanation of the mechanisms governing the HTC distribution in the absence of hot streaks and will be used as a baseline for discussing different scenarios presented here. Two clocking positions of hot streaks were tested, along with three different radial positions for each of the clocking scenarios. Additionally, different parameters of hot streak injection were varied, corresponding to hot streak temperature and velocity variations. Results indicate that while HS generally do not change the heat transfer coefficient distribution, the adiabatic surface temperature distribution is significantly affected. Unfortunately, the surface with the highest HTC, the TCF shroud, was also found to have the highest adiabatic wall temperature increase due to hot streak injection in most of the investigated scenarios.

Presenting Author: Patrick René Jagerhofer Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology

Presenting Author Biography: Patrick completed his PhD in 2023 at TU Graz, where he is now leading a research group on heat transfer and combustion in turbomachinery. His group currently works on two government-funded research projects that address heat transfer and film cooling in turbine center frames, including the presence of combustor hot streaks. In addition to heat transfer and film cooling measurements, his main interest lies in the development and improvement of innovative thermal measurement techniques.

Authors:

Ena Badžek Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Patrick René Jagerhofer Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Petar Bulović Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology
Marios Patinios GE Aerospace, Advanced Aviation Technology
Emil Göttlich Institute for Thermal Turbomachinery and Machine Dynamics, Graz University of Technology