Community Research and Development Information Service - CORDIS

Periodic Report Summary 1 - AMEL (Advanced Methods for the Prediction of Lean-burn Combustor Unsteady Phenomena)

Project Context and Objectives:
The objectives of the project are to produce increased knowledge and predictive capability of gas turbine combustors and especially from the perspectives of cooling, thermoacoustics, and extinction. Such knowledge is needed in producing low-emission aviation and power-generating gas turbines and is at present lacking. A combined experimental and computational approach is followed at two partner university institutions (Loughbourough and Cambridge) under the close collaboration of an ITD Member. The results so far provide a novel, detailed dataset for flame extinction in the presence of co-annular streams, as in the case of aviation gas turbines, new methods for predicting effusion-impingement cooling effectiveness, which are needed for high efficiency engines, and new methods to describe the acoustic behaviour of compressors and combustors and the flow field inside the combustor. The methodologies developed have been disseminated in international conferences and workshops and the respective computational codes and design rules have been delivered to the ITD partner, which is one of the key objectives of the project.

Project Results:
Computational Fluid Dynamics (CFD) methods for effusion-impingment cooling tiles have been developed successfully and agree well with experiment with isothermal flow. This work helps the industrial partner in designing more effective cooling systems. The low-order modelling of thermoacoustics has been advanced with the incorporation of compressor boundary conditions and the implementation of the G-equation strategy for flame motion, both improvements critical for the accuracy of design tools for combustors. The G-equation methodology has been enhanced from the perspective of fuel-air-ratio local fluctuations, which is important for improving the reliability of the calculations. CFD of thermoacoustics of single and forced and self-excited flames has been demonstrated successfully and this allows the calculation of flame transfer functions that are needed for understanding flame response but also used as an input to the low-order models that are regularly used to design against self-excited pressure fluctuations. The annular combustor CFD is also developed and will be validated by the end of the project with the comparison with experiment results. On the experimental side, swirl flames with co- and counter-swirl premixed, non-premixed, and spray flames have been studied from the perspective of flame structure and lean extinction, with the results showing a fundamental alteration of the extinction behaviour by a secondary co-flowing stream. The CFD activities on lean extinction show good predictions of the flame structure as blow-off is approached. Finally, forced flames in single and annular configurations have been studied experimentally and the results are used for validation of the CFD in addition to providing knowledge on the effects of fuel placement on flame response.

Potential Impact:
The developed knowledge and CFD methods will facilitate the design of new low-emissions gas turbines at lower cost than before because of the time saved when considering ideas and designs by the availability of reliable simulation tools. This will have a positive impact on profitability and job security of the gas turbine industry, while the construction of environmentally-friendly gas turbines will be easier.


Renata Schaeffer, (EU Policy Manager)
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Record Number: 189579 / Last updated on: 2016-10-12