Assessment of variable-cycle propulsion systems for ASTOVL

Authors: Yin, J; Pilidis, P; Ramsden, K.W.; Probert, S.D.

Source: Aircraft Engineering and Aerospace Technology: An International Journal, Volume 72, Number 6, 2000 , pp. 537-544(8)

Publisher: Emerald Group Publishing Limited

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Abstract:

The requirements imposed upon advanced short take-off and vertical landing (ASTOVL) aircraft give rise to challenging demands on their propulsion systems. One possible approach is to have a high-performance turbofan of traditional design and an additional, but separate, fan to provide a major part of the lift during the take-off and landing manoeuvres. For such a design, there are several quite-different choices of layout for providing the power to drive the remote fan by means of the core engine. These include shaft-driven and bleed-driven options. The choice will depend on the anatomy and required thermodynamic-performance of the whole system. In this paper, several pertinent alternative engine-designs are discussed. Four of these, based on a high-performance low-bypass-ratio core engine, are studied in detail and their behaviours compared. Prima facie, the preferred choice is the engine with the shaft-driven fan. A slightly less acceptable choice is the high-pressure turbine exit-bleed driven remote-fan.

Keywords: Gas Turbines; Aircraft; Propulsion

Document Type: Research article

DOI: http://dx.doi.org/10.1108/00022660010357756

Publication date: 2000-06-01