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Journal cover: Aircraft Engineering and Aerospace Technology

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Online from: 1929

Subject Area: Mechanical & Materials Engineering

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Recuperated gas turbine aeroengines, part II: engine design studies following early development testing

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Title:Recuperated gas turbine aeroengines, part II: engine design studies following early development testing
Author(s):Colin F. McDonald, (McDonald Thermal Engineering, La Jolla, California, USA), Aristide F. Massardo, (University of Genova, Faculty of Engineering, Genova, Italy), Colin Rodgers, (ITC San Diego, La Jolla, California, USA), Aubrey Stone, (San Diego, California, USA)
Citation:Colin F. McDonald, Aristide F. Massardo, Colin Rodgers, Aubrey Stone, (2008) "Recuperated gas turbine aeroengines, part II: engine design studies following early development testing", Aircraft Engineering and Aerospace Technology, Vol. 80 Iss: 3, pp.280 - 294
Keywords:Aircraft engines, Aircraft industries, Turbines
Article type:Technical paper
DOI:10.1108/00022660810873719 (Permanent URL)
Publisher:Emerald Group Publishing Limited
Acknowledgements:The authors would like to thank Dr John Mason, Professor David Gordon Wilson, Professor Pericles Pilidis, Bryan Seegers, and Jim Oswald for reviewing and providing valuable comments on the topic of this paper. This paper has been enhanced by the inclusion of hardware photographs and sketches, and the authors are appreciative to all concerned, with credits being duly noted.

Purpose – To advance the design of heat exchanged gas turbine propulsion aeroengines utilising experience gained from early development testing, and based on technologies prevailing in the 1970-2000 time frame.

Design/methodology/approach – With emphasis on recuperated helicopter turboshaft engines, particularly in the 1,000 hp (746?kW) class, detailed performance analyses, parametric trade-off studies, and overall power plant layouts, based on state-of-the-art turbomachinery component efficiencies and high-temperature heat exchanger technologies, were undertaken for several engine configuration concepts.

Findings – Using optimised cycle parameters, and the selection of a light weight tubular heat exchanger concept, an attractive engine architecture was established in which the recuperator was fully integrated with the engine structure. This resulted in a reduced overall engine weight and lower specific fuel consumption, and represented a significant advancement in technology from the modified simple-cycle engines tested in the late 1960s.

Practical implications – While heat exchanged engine technology advancements were projected, there were essentially two major factors that essentially negated the continued study and development of recuperated aeroengines, namely again as mentioned in Part I, the reduced fuel consumption was not regarded as an important economic factor in an era of low-fuel cost, and more importantly in this time frame very significant simple-cycle engine performance advancements were made with the use of significantly higher pressure ratios and increased turbine inlet temperatures. Simply stated, recuperated variants could not compete with such a rapidly moving target.

Originality/value – Establishing an engine design concept in which the recuperator was an integral part of the engine structure to minimise the overall power plant weight was regarded as a technical achievement. Such an approach, together with the emergence of lighter weight recuperators of assured structural integrity, would find acceptance around the year 2000 when there was renewed interest in the use of more efficient heat exchanged variants towards the future goal of establishing “greener” aeroengines, and this is discussed in Part III of this paper.

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