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.

Measurements and Calculations of Spectral Radiation Intensities for Turbulent Non-Premixed and Partially Premixed Flames

2003 ◽  
Vol 125 (4) ◽  
pp. 678-686 ◽  
Author(s):  
Yuan Zheng ◽  
R. S. Barlow ◽  
Jay P. Gore
Keyword(s):  
Experimental Data ◽  
Turbulent Combustion ◽  
Premixed Flames ◽  
Simulation Approach ◽  
Time And Space ◽  
Spectral Radiation ◽  
Partially Premixed Flames ◽  
The Mean ◽  
Partially Premixed ◽  
Infrared Array

Spectral radiation intensities leaving diametric and chord-like paths for six non-sooting flames were measured using an infrared array spectrometer. The spectral radiation intensities were also computed using the mean property approach and a time and space series simulation approach. Turbulence/radiation interactions (TRI) in these flames were investigated by comparing the two sets of computations to the experimental data. The effects of TRI are significant for regions away from the flame axis. The new data and findings are of value in the evaluation of radiation models, which are increasingly used in turbulent combustion calculations.

Comparison of Flame Transfer Functions Acquired by Chemiluminescence and Density Fluctuation

2016 ◽  
Author(s):  
Johannes Peterleithner ◽  
Riccardo Basso ◽  
Franz Heitmeir ◽  
Jakob Woisetschläger ◽  
Raimund Schlüßler ◽  
...  
Keyword(s):  
Equivalence Ratio ◽  
Transfer Functions ◽  
Turbulent Flame ◽  
Time Derivative ◽  
Density Fluctuations ◽  
Time Resolved ◽  
Partially Premixed Flames ◽  
Partially Premixed ◽  
Premixed Turbulent Flame ◽  
First Time

The goal of this study was to measure the Flame Transfer Function of a perfectly and a partially premixed turbulent flame by means of Laser Interferometric Vibrometry. For the first time, this technique is used to detect integral heat release fluctuations. The results were compared to classical OH*-chemiluminescence measurements. Effects of equivalence ratio waves and vortex rollup were found within those flames and were then investigated by means of time resolved planar CH*/OH*-chemiluminescence and Frequency modulated Doppler global velocimetry. This work is motivated by the difficulties chemiluminescence encounters when faced with partially premixed flames including equivalence ratio waves and flame stretching. LIV, recording the time derivative of the density fluctuations as line-of-sight data, is not affected by these flame properties.

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.

scholarly journals A priori investigation of subgrid correlation of mixture fraction and progress variable in partially premixed flames

2018 ◽  
Vol 22 (5) ◽  
pp. 862-882 ◽  
Author(s):  
Zhi X. Chen ◽  
N. Anh Khoa Doan ◽  
Shaohong Ruan ◽  
Ivan Langella ◽  
N. Swaminathan
Keyword(s):  
Mixture Fraction ◽  
A Priori ◽  
Premixed Flames ◽  
Progress Variable ◽  
Partially Premixed Flames ◽  
Partially Premixed

Gravity, radiation, and coflow effects on partially premixed flames

2004 ◽  
Vol 16 (8) ◽  
pp. 2963-2974 ◽  
Author(s):  
Xiao Qin ◽  
Ishwar K. Puri ◽  
Suresh K. Aggarwal ◽  
Viswanath R. Katta
Keyword(s):  
Premixed Flames ◽  
Partially Premixed Flames ◽  
Partially Premixed
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