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research-article

INVESTIGATION OF FLAME STRUCTURE AND SOOT FORMATION IN A SINGLE SECTOR MODEL COMBUSTOR USING EXPERIMENTS AND NUMERICAL SIMULATIONS BASED ON THE LES/CMC APPROACH

[+] Author and Article Information
Andrea Giusti

Department of Engineering University of Cambridge Trumpington Street, CB2 1PZ, Cambridge, UK
ag813@eng.cam.ac.uk

Epaminondas Mastorakos

Department of Engineering University of Cambridge Trumpington Street, CB2 1PZ, Cambridge, UK
em257@eng.cam.ac.uk

Christoph Hassa

German Aerospace Center (DLR) Linder Hoehe, Cologne, Germany
christoph.hassa@dlr.de

Johannes Heinze

German Aerospace Center (DLR) Linder Hoehe, Cologne, Germany
johannes.heinze@dlr.de

Eggert Magens

German Aerospace Center (DLR) Linder Hoehe, Cologne, Germany
Eggert.Magens@dlr.de

Marco Zedda

Combustion Aerothermal Methods Rolls-Royce plc. PO Box 31, Derby DE24 8BJ, UK
marco.zedda@rolls-royce.com

1Corresponding author.

ASME doi:10.1115/1.4038025 History: Received July 01, 2017; Revised August 07, 2017

Abstract

In this work a single sector lean burn model combustor operating in pilot only mode has been investigated using both experiments and computations with the main objective of analyzing the flame structure and soot formation at conditions relevant to aero-engine applications. Numerical simulations were performed using the Large Eddy Simulation (LES) approach and the Conditional Moment Closure (CMC) combustion model with detailed chemistry and a two-equation model for soot. The rig investigated in this work, called Big Optical Single Sector (BOSS) rig, allows to test real scale lean burn injectors. Experiments, performed at elevated pressure and temperature, corresponding to engine conditions at part load, include OH-PLIF and PDA and have been complemented with new LII measurements for soot location, allowing a comprehensive analysis of the primary combustion region and to further assess and validate the LES/CMC approach to capture the flame behaviour at engine conditions. It is shown that the LES/CMC approach is able to predict the main characteristics of the flame with a good agreement with the experiment in terms of flame shape, spray characteristics and soot location. Finite-rate chemistry effects appear to be important in the region very close to the injector exit leading to the lift-off of the flame. Low levels of soot are observed immediately downstream of the injector exit. Further downstream, the strong production of soot precursors together with high soot surface growth rates lead to high values of soot volume fraction in locations consistent with the experiment.

Copyright (c) 2017 by ASME
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