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will be incorporated into the next generation PW1100G geared fan engine which is slated to enter service in 2022-25. Open Rotor Technology While the GTF demonstrator can be integrated into an existing, albeit relatively new and as yet unproven engine design, the open rotor or propfan as it is sometimes termed, provides for a completely different engine architecture. As such it is much the most ambitious of the SAGE technology demonstrator projects. It represents a potential step-change for commercial aviation, because it offers the prospect of a reduction in fuel burn and thence emissions of as much as 40 or even 50 per cent compared to current aircraft (Gunston, 2006). A performance improvement of this magnitude means that the open rotor concept is potentially an example of what Christensen (1997) terms a disruptive technology. Disruptive technologies re-define a product’s performance trajectory rendering existing technologies obsolete, often leading to the demise of some of the leading firms in the field. These are typically technologies with different attributes compared to existing mainstream products so that they are initially only of value in niche markets, but as the technology develops its performance even on mainstream attributes improves to the point where it displaces existing technologies. If existing firms don’t fully embrace the disruptive technology there is a very real prospect that they will exit the industry. The advent of the ‘jet age’ in the 1960s with the introduction of the jet engine into civil aviation for example, led to the exit of one of the leading aero engine manufacturers, Wright, because the firm was very slow to develop a jet engine preferring to stick with making increasingly sophisticated piston engines. The same thing happened to the leading manufacturer of piston engined commercial airliners, the California based firm of Douglas. Meanwhile a new entrant to commercial aviation, Boeing, flourished and ultimately came to dominate the industry, that is until wide-bodied jets came on to the scene when another new entrant, Airbus Industrie, appeared. Over the years engine manufacturers have improved the fuel burn of conventional turbofan engines by steadily increasing the bypass ratio (BPR), that is the proportion of cold air volume driven rearward by the engine’s fan in relation to the volume of hot gases coming from the core 6PDF Image | Sustainable and Green Engine (SAGE) Aircraft Engine of the Future
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