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Analysis on the behaviour of an aeroengine air-blast injection device with forced entries

Giuliani, Fabrice. Analysis on the behaviour of an aeroengine air-blast injection device with forced entries. PhD, Energétique et Dynamique des fluides, Ecole Nationale Supérieure de l'Aéronautique et de l'Espace, 2002, 177 p.

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Abstract

Recent advances in aeroengine design tend to diminish the thrust to weight ratio and to ameliorate the combustion efficiency, taking into account the optimisation of both pollutant emissions and noise level. Due to higher pressure and temperature ranges in the combustion chamber, instability processes exerted by aero-acoustic-combustion couplings may appear occasionally. Although such phenomena occurring in turboengines are investigated since the 80’s, the ONERA Centre de Toulouse took the initiative to develop an experimental set-up in order to investigate the 2- phase flow issued from an air-blast atomiser driven by combustion instability processes, under non-reacting and reacting conditions. The modulation exerted by the acoustic pressure on the injection is experimentally simulated by pulsating the entries (air and fuel with specific actuators) placed upstream the injector. The present PhD thesis reviews the characterisation of the spray generated by a modelled air-blast injector with forced entries, under non-reacting conditions and in the combustion case. First the general context of the study is discussed, leading to the technical choices made for the set-up. The measurement techniques developed in order to follow high-frequency phenomena involved in the spray are defined and validated. Free and confined jet configurations are compared. The analysis focuses on the dynamics of the pulse swirled jet and the effect on the transported phase under non-reacting conditions. The observations in combustion lead to the highlighting of both vortical motion and convective effects within the mixing transport on the location and shape of the flame front.

Item Type:PhD Thesis
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE-SUPAERO (FRANCE)
Research Director:
Ledoux, Michel
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Deposited On:11 May 2022 08:39

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