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Research Papers: Fuel Combustion

Laser Ignition and Flame Speed Measurements in Oxy-Methane Mixtures Diluted With CO2

[+] Author and Article Information
Bader Almansour, Luke Thompson, Joseph Lopez, Ghazal Barari

Center for Advanced Turbomachinery
and Energy Research (CATER),
Mechanical and Aerospace
Engineering Department,
University of Central Florida,
Orlando, FL 32816

Subith S. Vasu

Center for Advanced Turbomachinery
and Energy Research (CATER),
Mechanical and Aerospace
Engineering Department,
University of Central Florida,
Orlando, FL 32816
e-mail: subith@ucf.edu

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received June 24, 2015; final manuscript received October 22, 2015; published online December 1, 2015. Editor: Hameed Metghalchi.

J. Energy Resour. Technol 138(3), 032201 (Dec 01, 2015) (9 pages) Paper No: JERT-15-1224; doi: 10.1115/1.4031967 History: Received June 24, 2015; Revised October 22, 2015

Ignition and flame propagation in methane/O2 mixtures diluted with CO2 are studied. A laser ignition system and dynamic pressure transducer are utilized to ignite the mixture and to record the combustion pressure, respectively. The laminar burning velocities (LBVs) are obtained at room temperature and atmospheric pressure in a spherical combustion chamber. Flame initiation and propagation are recorded by using a high-speed camera in select experiments to visualize the effect of CO2 proportionality on the combustion behavior. The LBV is studied for a range of equivalence ratios (ϕ = 0.8–1.3, in steps of 0.1) and oxygen ratios, D = O2/(O2 + CO2) (26–38% by volume). It was found that the LBV decreases by increasing the CO2 proportionality. It was observed that the flame propagates toward the laser at a faster rate as the CO2 proportionality increases, where it was not possible to obtain LBV due to the deviation from spherical flame shape. Current LBV data are in very good agreement with existing literature data. The premixed flame model from chemkin pro (Reaction Design, 2011, CHEMKIN-PRO 15112, Reaction Design, San Diego, CA) software and two mechanisms (GRI-Mech 3.0 (Smith et al., 1999, “The GRI 3.0 Chemical Kinetic Mechanism,” http://www.me.berkeley.edu/gri_mech/) and ARAMCO Mech 1.3 (Metcalfe et al., 2013, “A Hierarchical and Comparative Kinetic Modeling Study of C1–C2 Hydrocarbon and Oxygenated Fuels,” Int. J. Chem. Kinetics, 45(10), pp. 638–675)) are used to simulate the current data. In general, simulations are in reasonable agreement with current data. Additionally, sensitivity analysis is carried out to understand the important reactions that influence the predicted flame speeds. Improvements to the GRI predictions are suggested after incorporating latest reaction rates from literature for key reactions.

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References

Figures

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Fig. 1

Schematic representation of the experimental setup

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Fig. 2

Combustion pressure traces at an equivalence ratio of 1 and different oxygen ratios (reader is referred to the online version of this article for color info)

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Fig. 3

Measured LBV at an equivalence ratio of 1 as a function of oxygen ratio

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Fig. 4

The adiabatic flame temperature versus equivalence ratio at different O2 ratios. Also shown is results in air (reader is referred to the online version of this article for color info).

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Fig. 5

Combustion pressure traces at D = 35% and different equivalence ratios (reader is referred to the online version of this article for color info)

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Fig. 6

Measured LBV versus equivalence ratio at different O2 ratios. Predictions of GRI-Mech 3.0 [29] and ARAMCO Mech 1.3 [36] are also shown to be in good agreement with the current data.

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Fig. 7

Current LBV data for mixture with D = 35% at different equivalence ratios with those of Xie et al. [5], Hu et al. [4], and Konnov and Dyakov [6]

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Fig. 8

Current LBV data for mixture with D = 32% at different equivalence ratios with those of Konnov and Dyakov [6]

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Fig. 9

Flame propagation for CH4, O2, and CO2 at an equivalence ratio of 1 and D = 26%. Laser is incident from top. Window diameter is 1.85 in. Note that LBV data are neglected in this case due to nonspherical flame.

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Fig. 10

Flame propagation for CH4, O2, and CO2 and D = 38%, at an equivalence ratio of 0.9 ((a) and (b)), and 1.1 ((c) and (d)). Laser is incident from top. Window diameter is 1.85 in.

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Fig. 11

CO2 sensitivity for D = 38%, T = 1140 K

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Fig. 12

CO2 sensitivity for D = 35%, T = 1140 K

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Fig. 13

CO2 sensitivity for D = 32%, T = 1140 K

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Fig. 14

OH, O, and H radicals mole fraction at different CO2 fraction of CH4/CO2/O2 mixture, Φ = 1: solid lines—D = 38% and dashed lines—D = 32% (reader is referred to the online version of this article for color info)

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Fig. 15

Comparison of current data with GRI-Mech 3.0 [29] predictions (modified and unmodified mechanisms, see text for details)

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