This article reports experiments carried out in the MICCA-spray combustor developed at EM2C laboratory. This system comprises 16 swirl spray injectors. Liquid n-heptane is injected by simplex atomizers. The combustion chamber is formed by two cylindrical quartz tubes allowing full optical access to the flame region and it is equipped with 12 pressure sensors recording signals in the plenum and chamber. A high-speed camera provides images of the flames and photomultipliers record the light intensity from different flames. For certain operating conditions, the system exhibits well defined instabilities coupled by the first azimuthal mode of the chamber at a frequency of 750 Hz. These instabilities occur in the form of bursts. Examination of the pressure and the light intensity signals gives access to the acoustic energy source term. Analysis of the phase fluctuations between the two signals is carried out using cross-spectral analysis. At limit cycle, large pressure fluctuations of 5000 Pa are reached, and these levels persist over a finite period of time. Analysis of the signals using the spin ratio indicates that the standing mode is predominant. Flame dynamics at the pressure antinodal line reveals a strong longitudinal pulsation with heat release rate oscillations in phase and increasing linearly with the acoustic pressure for every oscillation levels. At the pressure nodal line, the flames are subjected to large transverse velocity fluctuations leading to a transverse motion of the flames and partial blow-off. Scenarios and modeling elements are developed to interpret these features.
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March 2018
Research-Article
Strong Azimuthal Combustion Instabilities in a Spray Annular Chamber With Intermittent Partial Blow-Off
Kevin Prieur,
Kevin Prieur
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France;
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France;
Safran Tech,
E&P, Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
E&P, Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
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Daniel Durox,
Daniel Durox
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
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Thierry Schuller,
Thierry Schuller
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
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Sébastien Candel
Sébastien Candel
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
e-mail: kevin.prieur@centralesupelec.fr
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
e-mail: kevin.prieur@centralesupelec.fr
Search for other works by this author on:
Kevin Prieur
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France;
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France;
Safran Tech,
E&P, Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
E&P, Châteaufort, CS 80112,
Magny-Les-Hameaux 78772, France
Daniel Durox
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
Thierry Schuller
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
Sébastien Candel
Laboratoire EM2C,
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
e-mail: kevin.prieur@centralesupelec.fr
CNRS, CentraleSupélec,
Université Paris-Saclay,
Châtenay-Malabry cedex 92295, France
e-mail: kevin.prieur@centralesupelec.fr
1Corresponding author.
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 4, 2017; final manuscript received July 18, 2017; published online October 17, 2017. Editor: David Wisler.
J. Eng. Gas Turbines Power. Mar 2018, 140(3): 031503 (10 pages)
Published Online: October 17, 2017
Article history
Received:
July 4, 2017
Revised:
July 18, 2017
Citation
Prieur, K., Durox, D., Schuller, T., and Candel, S. (October 17, 2017). "Strong Azimuthal Combustion Instabilities in a Spray Annular Chamber With Intermittent Partial Blow-Off." ASME. J. Eng. Gas Turbines Power. March 2018; 140(3): 031503. https://doi.org/10.1115/1.4037824
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