HISAC - Environmentally Friendly High Speed Aircraft
Overview
Background & policy context:
Many projects have been carried out in Europe and in other countries addressing the large supersonic transport aircraft market. None have yet emerged due to the difficulty to overcome economic and environmental issues. However, beyond the current market for small subsonic aircraft, there is a substantial segment of customers interested in flight time being reduced by 20% to 50% as compared with current subsonic business aircraft on distances over 6 500 km (which is the minimum required for transatlantic flights).
Objectives:
The objectives of the 'Environmentally friendly high speed aircraft' (HISAC) project were:
- To identify the characteristics of aircraft that could meet the prospective requirements;
- To provide policy makers with a set of recommendations for future environmental regulations (several sets of commercial characteristics of the aircraft will be considered);
- To provide progress on: Elementary technologies; Associated design and optimisation multidisciplinary methods;
- To identify the roadmaps for further technology maturation;
- To provide general trade-offs.
Methodology:
The project was structured into five work packages, which in turn included several sub-tasks:
Work package 1
The work package included the following sub-tasks:
- WP 1.1: Noise criteria
- WP 1.2: Atmospheric emissions criteria
- WP 1.3: Sonic boom criteria
Work package 2
The work package included the following sub-tasks:
- Task 2.1: Noise modelling
- Task 2.2: Emission modelling
- Task 2.3: Sonic boom modelling
- Task 2.4: Engine modelling
- Task 2.5: Aerodynamic modelling
- Task 2.6: MDO process
The objectives of WP 2 were:
- to select and validate analysis and design models, tools and methods,
- to perform focused improvements, in the fields of noise, emissions, sonic boom, engine models, aerodynamics, and multidisciplinary design optimisation (MDO). Input to this task are pre-existing modelling tools available at each partner.
Work package 3a
The work package included the following sub-tasks:
- WP 3.1: Variable cycle engine technologies
- WP 3.2: Nozzle noise reduction technologies
The work started on definition of requirements to CCV modelling tool update. It was done upon CCV cycle and performance analysis. First loop cycle analysis of CCV engine was performed on a base of pre-existing engine cycle model in WP2.4 for engine specifications coming from WP5.1.
Work package 3b
The work package included the following sub-tasks:
- WP 3.3: Forced laminar flow
- WP 3.4: High lift devices
- WP 3.5: Variable geometry wing
WP3b focused on wing airframe technologies that are critical and specific to supersonic aircrafts.
Work package 4
The work package included the following sub-tasks:
- Aerodynamic design and assessment
- Sonic boom design and assessment
- Acoustic design and assessment
Work package 5
The work package included the following tasks:
- Technical aspects
- Description of the exchanges between wp5 and the other work packages
- Design activities
- Trade-off activities
- Synthesis task
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