In order to achieve the overall ENOVAL objectives, innovative low pressure spool technologies with their specific individual contributions have been defined, which – as an overall purpose of ENOVAL – are to be successfully validated at component level up to TRL5.
As a breakthrough technology, ENOVAL will significantly expand the design space to higher BPR in order to increase the propulsive efficiency. This can only be achieved by having a more efficient and compact turbo machinery increasing the aero-engine OPR. The increase of BPR for a specific aircraft application will lead to additional weight and drag due to the increase of the fan diameter. Weight reduction measures in the components of the whole propulsion system (fan module and turbo machinery incl. nacelle) will minimise or even compensate this increase. The higher OPR will lead to smaller core engine diameters, while stiffer light weight structures and new design concepts for a smaller and shorter nacelle are required. Together with the weight saving of the overall aircraft system due to the need of less fuel to be carried on board, the trade will still allow for an overall improvement.
ENOVAL's high level fuel burn and noise objectives will be enabled by the following three breakthroughs and contributing technologies: