Sub-Project 5 for Low pressure shaft
SP5 tests new concepts for a low-pressure shaft (which has to handle higher torque loads because of the slower fan speed). (Source : Brochure)
The LP Shaft transmits the torque between the LP Turbine and the Fan/Booster. Its external diameter and the HP core weight are linked through the HP Turbine disks. For CRTF architecture, two LP Shafts are needed : the geometry constrains are stronger. (source : Kick off meeting)
Objectives
• Find a breakthrough shaft technology that is able to transmit a higher torque
• Improve torque density by 50% increase.
Challenge
Shaft technologies will be applicable to all engine architectures studied in VITAL:
Approach
In VITAL two shaft technologies will be studied, in order to improve torque admitted:
• Evaluation of MMC technology application to shafts, up to manufacture demonstration
• Improvement of metallic shafts by using multi-metallic (welded) material.
Expected results
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- Sub-Project 1 for whole engine assessment
- SP1 oversees the technical unity of the other sub-projects, and is in charge of design for each of the three engine architectures.
- Sub-Project 2 for Fan modules
- SP2 tests new fan module concepts and measures their aero-acoustic performance (contra-fan or lightweight fan).
- Sub-Project 3 for Booster
- SP3 evaluates the slow and high-speed booster (low-pressure compressors) concepts applicable to the different configurations.
- Sub-Project 4 for Structures
- SP4 focuses on new lightweight structural material (Hot and cold structures form the engine " back bone"). They provide basic engine stiffness and transfer high mechanical loads to and from the engine interior. Therefore the structures contributes to 15 - 20% of the engine weight.
- Sub-Project 6 for Low pressure turbine
- SP6 seeks to identify new, lighter and quieter turbine concepts.
- Sub-Project 7 for Installation
- SP7 evaluates the impact of installing a high-bypass-ratio engine under the wing.