Sub-Project 6 for Low pressure turbine
SP6 seeks to identify new, lighter and quieter turbine concepts.
Objectives
The high level objective is to develop and validate low pressure turbine technology for:
• 20% weight reduction without efficiency penalties with a TRL of 5 and 30% weight reduction with a TRL of 3
• Noise reduction of 3 EPNdB for approach at turbine level with a TRL of 5 and 4.5 dB with a TRL of 3
Challenge
• LPT 20% of total engine weight for VHBR
• As more stages are needed the LPT module weight increases by 45% for a mid thrust engine
• With VHBR engines the fan and jet noise decreases and the relative contribution of the low pressure turbine, noise increases.
Approach
• Ultra high lift airfoil design (reduced blade count)
• Ultra high stage loading (reduced number of stages)
• Lightweight materials (ceramic NGV)
• Lightweight design solutions Ultra low noise design measures (wake control, cavity/end wall flow control, integration with low weight hot structure, active noise suppression)
• UHL, UHSL and ULN technology validation
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 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)
- Sub-Project 7 for Installation
- SP7 evaluates the impact of installing a high-bypass-ratio engine under the wing.