Thermodynamics Cycle Analysis, Pressure Loss, and Heat Transfer Assessment of a Recuperative System for Aero-Engines
Aiming in the direction of designing more efficient aero-engines, various concepts have been developed in recent years, among which is the concept of an intercooled and recuperative aero-engine. Particularly, in the area of recuperation, MTU Aero Engines has been driving research activities in the l...
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Veröffentlicht in: | Journal of engineering for gas turbines and power 2015-04, Vol.137 (4) |
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Sprache: | eng |
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Zusammenfassung: | Aiming in the direction of designing more efficient aero-engines, various
concepts have been developed in recent years, among which is the concept of an
intercooled and recuperative aero-engine. Particularly, in the area of
recuperation, MTU Aero Engines has been driving research activities in the last
decade. This concept is based on the use of a system of heat exchangers (HEXs)
mounted inside the hot-gas exhaust nozzle (recuperator). Through the operation
of the system of HEXs, the heat from the exhaust gas downstream the LP turbine
of the jet engine is driven back to the combustion chamber. Thus, the preheated
air enters the engine combustion chamber with increased enthalpy, providing
improved combustion and by consequence, increased fuel economy and low-level
emissions. If additionally an intercooler is placed between the compressor
stages of the aero-engine, the compressed air is then cooled by the intercooler;
thus, less compression work is required to reach the compressor target pressure.
In this paper, an overall assessment of the system is presented with particular
focus on the recuperative system and the HEXs mounted into the aero-engine's
exhaust nozzle. The herein presented results were based on the combined use of
CFD computations, experimental measurements, and thermodynamic cycle analysis.
They focus on the effects of total pressure losses and HEX efficiency on the
aero-engine performance especially the engine's overall efficiency and the
specific fuel consumption (SFC). More specifically, two different hot-gas
exhaust nozzle configurations incorporating modifications in the system of HEXs
are examined. The results show that significant improvements can be achieved in
overall efficiency and SFC, hence contributing to the reduction of
CO2 and NOx emissions. The design of a more
sophisticated recuperation system can lead to further improvements in the
aero-engine efficiency in the reduction of fuel consumption. This work is part
of the European funded research program Low Emissions Core engine Technologies
(LEMCOTEC). |
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ISSN: | 0742-4795 1528-8919 |
DOI: | 10.1115/1.4028584 |