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Aerospace 2017, 4(1), 14; doi:10.3390/aerospace4010014

Optimization of Heat Exchangers for Intercooled Recuperated Aero Engines

1
Department of Mechanical Engineering, Technological Educational Institute (TEI) of Central Macedonia, Serres 62124, Greece
2
Laboratory of Fluid Mechanics & Turbomachinery, Department of Mechanical Engineering, Aristotle University of Thessaloniki, Thessaloniki 54124, Greece
3
MTU Aero Engines AG, Munich 80995, Germany
*
Author to whom correspondence should be addressed.
Academic Editors: Simon Blakey, Sigrun Matthes, Paul Brok, Volker Grewe and Simon Christie
Received: 29 December 2016 / Revised: 21 February 2017 / Accepted: 26 February 2017 / Published: 13 March 2017
View Full-Text   |   Download PDF [8193 KB, uploaded 13 March 2017]   |  

Abstract

In the framework of the European research project LEMCOTEC, a section was devoted to the further optimization of the recuperation system of the Intercooled Recuperated Aero engine (IRA engine) concept, of MTU Aero Engines AG. This concept is based on an advanced thermodynamic cycle combining both intercooling and recuperation. The present work is focused only on the recuperation process. This is carried out through a system of heat exchangers mounted inside the hot-gas exhaust nozzle, providing fuel economy and reduced pollutant emissions. The optimization of the recuperation system was performed using computational fluid dynamics (CFD) computations, experimental measurements and thermodynamic cycle analysis for a wide range of engine operating conditions. A customized numerical tool was developed based on an advanced porosity model approach. The heat exchangers were modeled as porous media of predefined heat transfer and pressure loss behaviour and could also incorporate major and critical heat exchanger design decisions in the CFD computations. The optimization resulted in two completely new innovative heat exchanger concepts, named as CORN (COnical Recuperative Nozzle) and STARTREC (STraight AnnulaR Thermal RECuperator), which provided significant benefits in terms of fuel consumption, pollutants emission and weight reduction compared to more conventional heat exchanger designs, thus proving that further optimization potential for this technology exists. View Full-Text
Keywords: heat exchangers; porosity model; recuperation; aero engine optimization heat exchangers; porosity model; recuperation; aero engine optimization
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Misirlis, D.; Vlahostergios, Z.; Flouros, M.; Salpingidou, C.; Donnerhack, S.; Goulas, A.; Yakinthos, K. Optimization of Heat Exchangers for Intercooled Recuperated Aero Engines. Aerospace 2017, 4, 14.

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