Effect of the mixing fields on the stability and structure of turbulent partially premixed flames in a concentric flow conical nozzle burner

2017 ◽  
Vol 175 ◽  
pp. 180-200 ◽  
Author(s):  
Mohy S. Mansour ◽  
Ayman M. Elbaz ◽  
William L. Roberts ◽  
Mohamed S. Senosy ◽  
Mohamed F. Zayed ◽  
...  
Keyword(s):  
Premixed Flames ◽  
Conical Nozzle ◽  
Partially Premixed Flames ◽  
Partially Premixed ◽  
The Stability ◽  
Concentric Flow

Structure and Extinction of Heptane/Air Partially Premixed Flames

AIAA Journal ◽  
2002 ◽  
Vol 40 (11) ◽  
pp. 2289-2297 ◽  
Author(s):  
Hongshe Xue ◽  
Suresh K. Aggarwal
Keyword(s):  
Premixed Flames ◽  
Partially Premixed Flames ◽  
Partially Premixed

Numerical Analysis of Equivalence Ratio Fluctuations in a Partially Premixed Gas Turbine Combustor Using Large Eddy Simulations

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Ping Wang ◽  
Qian Yu ◽  
Prashant Shrotriya ◽  
Mingmin Chen
Keyword(s):  
Reaction Mechanism ◽  
Equivalence Ratio ◽  
Flame Temperature ◽  
Premixed Flames ◽  
Large Eddy Simulations ◽  
Combustion Model ◽  
Inlet Channel ◽  
Large Eddy ◽  
Partially Premixed Flames ◽  
Partially Premixed

In the present work, the fluctuations of equivalence ratio in the PRECCINSTA combustor are investigated via large eddy simulations (LES). Four isothermal flow cases with different combinations of global equivalence ratios (0.7 or 0.83) and grids (1.2 or 1.8 million cells) are simulated to study the mixing process of air with methane, which is injected into the inlet channel through small holes. It is shown that the fluctuations of equivalence ratio are very large, and their ranges are [0.4, 1.3] and [0.3, 1.2] for cases 0.83 and 0.7, respectively. For simulating turbulent partially premixed flames in this burner with the well-known dynamically thickened flame (DTF) combustion model, a suitable multistep reaction mechanism should be chosen aforehand. To do that, laminar premixed flames of 15 different equivalence ratios are calculated using three different methane/air reaction mechanisms: 2S_CH4_BFER, 2sCM2 reduced mechanisms and GRI-Mech 3.0 detailed reaction mechanism. The variations of flame temperature, flame speed and thickness of the laminar flames with the equivalence ratios are compared in detail. It is demonstrated that the applicative equivalence ratio range for the 2S_CH4_BFER mechanism is [0.5, 1.3], which is larger than that of the 2sCM2 mechanism [0.5, 1.2]. Therefore, it is recommended to use the 2S_CH4_BFER scheme to simulate the partially premixed flames in the PRECCINSTA combustion chamber.

Time and Space Series Analysis of Spectral Radiation Intensities for a Partially Premixed Turbulent Flame

2003 ◽  
Author(s):  
Yuan Zheng ◽  
Jay P. Gore
Keyword(s):  
Single Point ◽  
Turbulent Flame ◽  
Premixed Flames ◽  
Model Parameters ◽  
Time And Space ◽  
Spectral Radiation ◽  
Series Analysis ◽  
Partially Premixed Flames ◽  
Partially Premixed ◽  
Premixed Turbulent Flame

A recently developed technique called time and space series analysis was used to calculate the mean and fluctuating spectral radiation intensities leaving diametric and chord-like paths in turbulent partially premixed flames. A standard flame (Flame D) from Sandia Workshop on Turbulent Non-premixed Flames was selected to allow an evaluation of the radiation calculations at least at the single point statistics level. Measurements of spectral radiation intensities using a fast infrared array spectrometer provide an evaluation of the computations and also allow estimation of the length and time scales of scalar fluctuations, which appear as model parameters in the time and space series analysis modeling.

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