An aero engine staged combustion fuel distribution control system design is analyzed in the framework of the LECCAGT research project. The motivation for developing a staged combustion system is outlined and the control-related issues of such an approach are highlighted for a civil aerospace application. Findings of an analysis of the emission minimisation are presented and control-related issues of optimal fuel distribution are addressed. Multi-objective genetic algorithms are implemented for the automation of the engine fuel distribution optimisation. Bumpless transfer techniques for priming and purging of burner stages during transient manoeuvres are analysed and presented. Reduction in NOx emissions was the primary objective in the design of the fuel distribution control laws. With this in mind, a simplified analytical analysis of the NOx emissions is presented to highlight the optimal distribution of the fuel between combustors. It is reassuring to note that the results of this optimisation analysis confirm what is sensible from a practical standpoint. That is, to minimise NOx emissions the fuel through the main burners should be burnt equally within each combustion module. It is recognised that this optimisation analysis ignores practical constraints that must be placed upon it (i.e. minimum fuel flows necessary to ensure flame-out is avoided and which is a particular key issue in lean burn combustor modules), but provides a useful basis for the future optimisation.
Staged combustion control design for aero engines
Ein gestaffelter Regelungsentwurf für die Verbrennung bei Luftmotoren
Control Engineering Practice ; 14 , 4 ; 387-396
2006
10 Seiten, 10 Bilder, 1 Tabelle, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
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