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| 3.8.7. ITACA |
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Results Presentation
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Project summary
The excessive pollution produced by the aircraft engines has to be drastically reduced due to new regulations concerning environment protection. To coupe with NOx emissions reduction the future turboreactor engines will be characterized by lean premixed flames (increase of the air/fuel ratio). This improvement leads, among others, closer to the flame blowout limit, which means reduction of the burning temperature. In these conditions the pollutant emissions are decreased but appear thermoacoustic instabilities. The acoustic resonance induced by flame fluctuations can generate big pressure oscillations inside combustion chamber. These thermoacoustic instabilities can produce, among growth of the acoustic emissions, even deterioration of the mechanical properties of the structure.
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General Objectives
a) Development of new techniques and technologies for thermoacoustic instabilities mechanisms observed inside the combustion chamber of the aircraft engines ;
b) The proposition of new type of system that can control actively the suppression of these instabilities for a wide range of operation conditions .
Specific objectives and estimated results
a) Construction of a combustion chamber model for experimental tests;
b) Dominant frequencies identification at the inlet of the combustion chamber;
c) Comparison between experimental and numerical results;
d) Interpretation of the obtained results and identification of the instabilities mechanisms;
e) Active control system proposal for instabilities suppression.
The novelty of this project are the usage of high performance computing programs and modern technologies of active control of flame stability in low premixed combustion.
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The consortium
CO - www.comoti.ro - National Research and Development of Gas Turbines COMOTI, BUCHAREST
P1 - www.upb.ro - Faculty of Aerospace Engineering, University Politehnica, BUCHAREST
P2 - www.imar.ro - Institute of Mathematical Statistics and Applied Matematics
P3 - www.aerostar.ro - AEROSTAR SA - BACAU
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Activities and responsabilities of each partner
CO, P1, P2 – Research regarding experimental installations for combustion chamber testing
CO, P1 – Research regarding numerical simulation in the field
CO, P1, P2, P3 – Acquisition of equipment and software, definition of the experimental installation, numerical simulation with a CFD code of the experimental combustion chamber, dominant frequencies determination.
CO, P3 – Definition of the test program, instrumentation of the combustion chamber, execution drawings for the experimental installation, manufacture the necessary parts, set-up of the experiment, collecting experimental data.
CO, P1, P2 – Comparison and interpretation of the results obtained, definition of a active control system for the combustion instabilities, results publishing.
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