04 - Propulsion

KEY TECHNOLOGIES FOR THE NEXT GENERATION OF CIVIL AIRCRAFT ENGINES

F. Haselbach, Rolls-Royce plc, United Kingdom

The Paper describes key technologies and engine architectures leading to low emissions, low fuel consumption products in the civil aircraft engine market. Examples are key new product lines of Rolls-Royce as well as technology demonstrators. Emphasis will be on the engine architectures, and the utilisation of advanced core engine and low pressure system technologies, aerothermal considerations for compressors, turbines and air system, combustion, material & sub-system technologies. The paper builds on the 2012 ICAS publication [1] and 2014 publication [2] of the authors on hot-end technologies and engine concepts, respectively. It will enlarge on the work laid out on key sub-systems and the design opportunity-space modelling by updating the comprehensive review of the important technologies given in these papers by further discussion how these technologies enable innovative whole engine architectures. Furthermore, a comprehensive status of the technologies maturity will be given.rnrnAt first, a comprehensive maturity-status of the technologies discussed in 2012/14 will be given. These technologies are amongst others those aiding the improvement of thermal efficiency. The thermal efficiency of the engine is dominated by the capability of the hot section sub-systems (Compressors, Combustors and core turbines) in terms of aerodynamic compressor efficiency level as well as hot section cooling flow consumption, performance and durability in combination with a maximum achievable turbine entry temperature. The key technologies for advanced core technologies, such as aerothermal design, thermos-mechanical optimisation, materials and intelligent, adaptive system solutions will be discussed and rated. Aspects of sub-system integration and cross sub-system optimisation will be highlighted and how they act as an enable for certain engine architectures. rnrnThe rear section of the paper will combine the strands of core and low pressure system technology programmes of Rol

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