NDLI: A Gas Turbine Cycle Selection Issue: Recuperated or ICR

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Rodgers, Colin Stone, Aubrey White, David
Copyright Year	2007
Abstract	The intercooled recuperative gas turbine (ICR) potentially offers the advantages of higher specific power, and improved thermal efficiency compared to the recuperative gas turbine, such advantages are however contingent upon the additional parasitic encumbrances of the intercooler heat dissipation or recovery apparatus and pressure losses, plus flowpath ducting and complexity. The thermodynamic performances, relative sizing and relative costs of both an ICR and recuperative gas turbine engine, with a thermal efficiency goal approaching 40%, combined with low exhaust emission requirements were studied. The study encompassed primary candidate engine flowpath configurations comprising of single shaft, two shaft, and two spool designs, with both recuperation (R), and combined Intercooling and Recuperation (ICR). In conducting the study all engine flowpaths were sized for 300kW with a maximum turbine inlet temperature of 1837F (1000C), representative of conservative life limits for conventional un-cooled superalloy turbine rotors. Heat exchanger effectivenesses of the intercooler and recuperator were selected at 80 and 85%, as a compromise between cost, weight, and thermal efficiency considerations. The study confirmed that the simple recuperated cycle is capable of comparable peak thermal efficiency levels to the ICR provided that ICR intercooling parasitic losses are duly accounted, and furthermore has intrinsically lower manufacturing and development costs than the ICR. The cycle performance code used for the studies included prediction of engine exhaust emissions, part load characteristics, and compressor operating lines. The emissions assessment slightly favored the ICR as a consequence of its higher specific power. Assuming part load operation at variable speed and constant turbine exhaust temperature, the two spool ICR showed slightly better part load fuel economy than a recuperated engine.
Sponsorship	International Gas Turbine Institute
Starting Page	373
Ending Page	381
Page Count	9
File Format	PDF
ISBN	0791847926
DOI	10.1115/GT2007-27910
e-ISBN	0791837963
Volume Number	Volume 3: Turbo Expo 2007
Conference Proceedings	ASME Turbo Expo 2007: Power for Land, Sea, and Air
Language	English
Publisher Date	2007-05-14
Publisher Place	Montreal, Canada
Access Restriction	Subscribed
Subject Keyword	Small gas turbine Recuperator Intercooler Cycles Gas turbines
Content Type	Text
Resource Type	Article

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Steady State Off-Design Performance of Humid Air Turbine Cycle

Feasibility Study of an Innovative Micro Gas Turbine With a Swiss-Roll Recuperator

Design and Off-Design Characteristics of the Alternative Recuperated Gas Turbine Cycle With Divided Turbine Expansion

Exergetic Analysis of the Part-Flow Evaporative Gas Turbine Cycles

A Feasibility Study of Existing Gas Turbines for Recuperated, Intercooled and Reheat Cycle

Steady-State Off-Design Thermodynamic Performance Analysis of a Humid Air Turbine Based on a Micro Turbine

Energy Analysis of Recuperated Gas Turbine Cycles With Mist Blade Cooling

Cycle Selection and Compressor Design of 600kW Simple Cycle Gas Turbine Engine

The Navy 500-Hour Test (NFHT) of the Intercooled Recuperated Gas Turbine Engine System (ICR)

A Gas Turbine Cycle Selection Issue: Recuperated or ICR

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