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Integrated Lean Low-Emission Combustor Design Methodology


The objective of this project is to develop a design methodology for lean burn, low-emission combustors to achieve a sufficient operability over the entire range of operating conditions whilst maintaining a low NOx emission capability. A knowledge-based design system will form the framework to capture existing combustor design knowledge and knowledge generated in this project.

Project objectives

Through a pressing demand for emissions reduction, very ambitious future NOx reduction targets of 80% by 2020 have been set. Existing design rules, for conventional combustion systems, cannot be applied for lean low-emission combustors. It is therefore important to define new design rules quickly, so that the new technology can be incorporated faster into future products.

The aim is to create the first building blocks of such an integrated combustor design system. The system will incorporate preliminary design tools to make first estimates of the arrangement for lean burn combustion, which meets operability, external aero-dynamics, cooling and emissions needs.

Description of the work

Guidelines for the design of lean low NOx combustors for reliable and safe operation will be derived. These guidelines will be incorporated in the knowledge-based combustor-engineering tool in order to strengthen European competitiveness by reducing development costs and time.

Lean blow out-limit, ignition and altitude relight will be investigated. The airflow distribution and the aero-design of pre-diffusers for lean low NOx combustion with up to 70% air consumption will be optimised.

Wall temperature prediction and testing for a highly efficient cooling design will be performed.

An assessment of generated knowledge and implementation in the knowledge-based system will take place.

Expected results

The new lean burn concepts have to gain customer and market acceptance to be fully competitive. The answers to principal questions concerning the operability and airworthiness of low NOx combustors will be given.