Research Papers: Gas Turbines: Aircraft Engine

Performance of the Clean Exhaust Engine Concept

[+] Author and Article Information
F. Noppel1

School of Engineering, Cranfield University, Bedfordshire MK43 0AL, UKf.g.noppel@cranfield.ac.uk

D. Lucisano, R. Singh

School of Engineering, Cranfield University, Bedfordshire MK43 0AL, UK


Corresponding author.

J. Eng. Gas Turbines Power 131(3), 031201 (Feb 06, 2009) (5 pages) doi:10.1115/1.3019142 History: Received January 15, 2008; Revised September 11, 2008; Published February 06, 2009

The climatic effects of air-traffic pollutants, such as carbon dioxide (CO2) and mononitrogen oxides (NOx), aerosols, contrails, and aviation induced cirrus clouds, are repeatedly stressed in assessment reports. It is therefore desired to reduce all aviation emissions simultaneously. In this paper, a novel propulsion concept, which has the potential to reduce all pollutants, is assessed regarding its performance. It is based on gas turbine technology, derived from the intercooled and recuperated engine cycle. Exhaust water condensation is facilitated inside the engine to avoid the formation of contrails. Particles and aerosols are scavenged from the exhaust gases during condensation. The condensed water is partially redirected into the combustion chamber to mitigate NOx emissions via water injection technique. Calculations suggest that this new concept allows higher thermal efficiencies than conventional designs, yielding in better fuel economy and hence reduces greenhouse gas emissions. The corresponding design parameters for bypass ratio and fan pressure ratio suggest that this concept might be well suited for propfans or remotely driven fans.

Copyright © 2009 by American Society of Mechanical Engineers
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Figure 1

Layout of the CEEC

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Figure 2

NOx reduction through water injection (adopted from Ref. 7)

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Figure 3

The engine stations on a phase diagram of water

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Figure 4

SFC versus specific thrust of the clean exhaust engine concept for various TETs

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Figure 5

Performance results and design variables of optimized clean exhaust engine cycles for a variety of TETs: overall engine efficiency (top left), bypass ratio (top right), overall pressure ratio (bottom left), and fan pressure ratio (bottom right)



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