Understanding the stability of turbulent flames is a key for the design of efficient combustion systems. The present paper reports an experimental study on the effect of the internal geometry of a rectangular orifice on the characteristics/stability of a turbulent methane flame. Three rectangular nozzles with different orifice lengths having an identical exit aspect ratio (AR) of 2 were used. The co-airflow strength was also varied to evaluate its effect on the jet flow emerging from the rectangular nozzle. The experimental data revealed that the jet initial conditions affect both the flow characteristics and the liftoff of turbulent diffusion methane flame. That is, increasing the orifice length of the rectangular nozzle resulted in delaying the occurrence of the axis-switching phenomenon, reducing the length of the jet potential core, and accelerating the liftoff transition of the attached flame. The co-airflow was found to reduce the velocity strain rate in the shear layer, displace the occurrence of axis-switching farther downstream of the jet, and delay flame detachment. The results revealed also that there is a clear interplay between the flame liftoff and the jet near-field molecular mixing and flow characteristics. That is, a rectangular jet which spreads faster and generates higher near-field velocity strain and turbulence intensity causes flame detachment at a lower fuel jet velocity. Based on this, a correlation was found between the flame liftoff velocity, the fuel molecular thermal diffusivity, the stoichiometric laminar flame speed, and the fuel jet strain rate at the nozzle exit. This relationship was shown to successfully predict the liftoff velocity of methane flame as well as other common gaseous hydrocarbons and hydrogen flames.
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August 2015
Research-Article
Near-Field Characteristics of a Rectangular Jet and Its Effect on the Liftoff of Turbulent Methane Flame
Mohsen Akbarzadeh,
Mohsen Akbarzadeh
Department of Mechanical Engineering,
e-mail: Mohsen.Akbarzadeh@umanitoba.ca
University of Manitoba
,Winnipeg
,Manitoba R3T 5V6
, Canada
e-mail: Mohsen.Akbarzadeh@umanitoba.ca
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Madjid Birouk
Madjid Birouk
Professor
Department of Mechanical Engineering,
e-mail: Madjid.Birouk@umanitoba.ca
Department of Mechanical Engineering,
University of Manitoba
,Winnipeg
,Manitoba R3T 5V6
, Canada
e-mail: Madjid.Birouk@umanitoba.ca
Search for other works by this author on:
Mohsen Akbarzadeh
Department of Mechanical Engineering,
e-mail: Mohsen.Akbarzadeh@umanitoba.ca
University of Manitoba
,Winnipeg
,Manitoba R3T 5V6
, Canada
e-mail: Mohsen.Akbarzadeh@umanitoba.ca
Madjid Birouk
Professor
Department of Mechanical Engineering,
e-mail: Madjid.Birouk@umanitoba.ca
Department of Mechanical Engineering,
University of Manitoba
,Winnipeg
,Manitoba R3T 5V6
, Canada
e-mail: Madjid.Birouk@umanitoba.ca
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received September 12, 2014; final manuscript received November 17, 2014; published online January 28, 2015. Editor: David Wisler.
J. Eng. Gas Turbines Power. Aug 2015, 137(8): 081502 (8 pages)
Published Online: August 1, 2015
Article history
Received:
September 12, 2014
Revision Received:
November 17, 2014
Online:
January 28, 2015
Citation
Akbarzadeh, M., and Birouk, M. (August 1, 2015). "Near-Field Characteristics of a Rectangular Jet and Its Effect on the Liftoff of Turbulent Methane Flame." ASME. J. Eng. Gas Turbines Power. August 2015; 137(8): 081502. https://doi.org/10.1115/1.4029371
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