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Research Papers: Gas Turbines: Cycle Innovations

Exergy Analysis and Performance Assessment for Different Recuperative Thermodynamic Cycles for Gas Turbine Applications

[+] Author and Article Information
Christina Salpingidou

Laboratory of Fluid Mechanics
& Turbomachinery,
Department of Mechanical Engineering,
Aristotle University of Thessaloniki,
Building D, 9th Floor,
Aristotle University Campus,
Thessaloniki 541 24, Greece
e-mail: csalpingidou@eng.auth.gr

Dimitrios Misirlis

Technological Educational Institute (TEI) of
Central Macedonia,
Terma Magnesia
Serres 621 24, Greece
e-mail: misirlis@eng.auth.gr

Zinon Vlahostergios

Laboratory of Fluid Mechanics
& Turbomachinery,
Department of Mechanical Engineering,
Aristotle University of Thessaloniki,
Building D, 9th Floor,
Aristotle University Campus,
Thessaloniki 541 24, Greece
e-mail: zinonv@eng.auth.gr

Stefan Donnerhack

MTU Aero Engines AG,
Dachauer Strasse 665,
Munich 80995, Germany
e-mail: stefan.donni@googlemail.com

Michael Flouros

MTU Aero Engines AG,
Dachauer Strasse 665,
Munich 80995, Germany
e-mail: michael.flouros@mtu.de

Apostolos Goulas

Laboratory of Fluid Mechanics
& Turbomachinery,
Department of Mechanical Engineering,
Aristotle University of Thessaloniki,
Building D, 9th Floor,
Aristotle University Campus,
Thessaloniki 541 24, Greece
e-mail: goulas@eng.auth.gr

Kyros Yakinthos

Laboratory of Fluid Mechanics
& Turbomachinery,
Department of Mechanical Engineering,
Building D, 9th Floor,
Aristotle University Campus,
Aristotle University of Thessaloniki,
Thessaloniki 541 24, Greece
e-mail: kyak@auth.gr

1Corresponding author.

Contributed by the Cycle Innovations Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 11, 2017; final manuscript received August 30, 2017; published online April 10, 2018. Editor: David Wisler.

J. Eng. Gas Turbines Power 140(7), 071701 (Apr 10, 2018) (10 pages) Paper No: GTP-17-1342; doi: 10.1115/1.4038362 History: Received July 11, 2017; Revised August 30, 2017

This work presents an exergy analysis and performance assessment of three recuperative thermodynamic cycles for gas turbine applications. The first configuration is the conventional recuperative (CR) cycle in which a heat exchanger is placed after the power turbine (PT). In the second configuration, referred as alternative recuperative (AR) cycle, a heat exchanger is placed between the high pressure and the PT, while in the third configuration, referred as staged heat recovery (SHR) cycle, two heat exchangers are employed, the primary one between the high and PTs and the secondary at the exhaust, downstream the PT. The first part of this work is focused on a detailed exergetic analysis on conceptual gas turbine cycles for a wide range of heat exchanger performance parameters. The second part focuses on the implementation of recuperative cycles in aero engines, focused on the MTU-developed intercooled recuperative aero (IRA) engine concept, which is based on a conventional recuperation approach. Exergy analysis is applied on specifically developed IRA engine derivatives using both alternative and SHR recuperation concepts to quantify energy exploitation and exergy destruction per cycle and component, showing the amount of exergy that is left unexploited, which should be targeted in future optimization actions.

Copyright © 2018 by ASME
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Figures

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Fig. 1

Simple Brayton cycle designed in CAPE-OPEN/COFE

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Fig. 2

Conventional recuperative cycle designed in CAPE-OPEN/COFE

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Fig. 3

AR cycle designed in CAPE-OPEN/COFE

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Fig. 4

Staged heat recovery recuperative cycle designed in CAPE-OPEN/COFE

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Fig. 5

Efficiency of all cycles as a function of pressure ratio and varying heat exchanger effectiveness

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Fig. 6

Conventional recuperation, components irreversibilities breakdown for various HEX effectiveness

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Fig. 7

Alternative recuperation, components irreversibilities breakdown for various HEX effectiveness

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Fig. 8

SHR recuperation, components irreversibilities breakdown for various HEX effectiveness

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Fig. 9

The IRA aero engine concept

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Fig. 10

The MTU-heat exchanger

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Fig. 11

Schematic illustration of alternative recuperation HEX between IPT-LPT

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Fig. 12

Schematic illustration of SHR (HEXs between IPT-LPT and downstream LPT)

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Fig. 13

Alternative recuperation cycle model in CAPE-OPEN/COFE software

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Fig. 14

Staged heat recovery cycle recuperation model in CAPE-OPEN/COFE software

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Fig. 15

SHR IRA concept, components irreversibilities breakdown

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Fig. 16

Alternative IRA concept, components irreversibilities breakdown

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Fig. 17

Conventional IRA concept, components irreversibilities breakdown

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