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research-article

EXPERIMENTAL STUDY OF AERONAUTICAL IGNITION IN A SWIRLED CONFINED JET-SPRAY BURNER

[+] Author and Article Information
Javier Marrero-Santiago

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
marreroj@coria.fr

Antoine Verdier

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
verdiera@coria.fr

Clement Brunet

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
clement.brunet@insa-rouen.fr

Alexis Vandel

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
vandel@coria.fr

Gilles Godard

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
godard@coria.fr

Gilles Cabot

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
gilles.cabot@coria.fr

Mourad Boukhalfa

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
mourad.boukhalfa@insa-rouen.fr

Bruno Renou

CORIA-UMR6614, Normandie Université, CNRS, INSA et Université de Rouen, 76800 Saint Etienne du Rouvray, France
renou@coria.fr

1Corresponding author.

ASME doi:10.1115/1.4037752 History: Received July 07, 2017; Revised July 12, 2017

Abstract

Aeronautical gas turbine ignition is critical for new lean-burner designs. The fundamental aspects of swirled confined two-phase flow ignition are addressed in the present work. Two facilities enable the analysis of two characteristic phases of the process. The KIAI-Spray single-injector burner was investigated in terms of local flow properties, including the air velocity and fuel droplet (n-heptane) size-velocity characterization by phase Doppler anemometry, and the study of local equivalence ratio by means of planar laser induced fluorescence on toluene. The initial spark location is vital to ensure successful ignition. An ignition probability map was elaborated varying the location of a laser-induced spark in the chamber under ultra-lean nominal conditions. The outer recirculation zone (ORZ) was found to be the best region for placing a spark and successfully igniting the mixture. A strong correlation was found between the ignition probability field, the local equivalence ratio and the airflow turbulent kinetic energy and velocity fields. Once a successful ignition is accomplished on one injector, the injector-to-injector propagation must be examined. High-speed visualization was applied on the KIAI-Spray linear multi-injector burner. Four injector-to-injector distances and four fuels of different volatilities (heptane, decane, dodecane and jet-A1) were evaluated. Spray branches and inter-injector regions changed with the inter-injector distance. Two different flame propagation mechanisms were identified: radial propagation and arc propagation. Ignition delay times were modified with the injector-to-injector distance and with the different fuels.

Copyright (c) 2017 by ASME
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