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Research Papers: Fuel Combustion

The Critical Pressure at the Onset of Flame Instability of Syngas/Air/Diluent Outwardly Expanding Flame at Different Initial Temperatures and Pressures

[+] Author and Article Information
Ziyu Wang

Mechanical and Industrial
Engineering Department,
Northeastern University,
Boston, MA 02115
e-mail: wang.ziyu2@husky.neu.edu

Ziwei Bai, Guangying Yu, Sai Yelishala, Hameed Metghalchi

Mechanical and Industrial
Engineering Department,
Northeastern University,
Boston, MA 02115

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received January 10, 2019; final manuscript received January 11, 2019; published online February 18, 2019. Special Editor: Reza Sheikhi.

J. Energy Resour. Technol 141(8), 082207 (Feb 18, 2019) (11 pages) Paper No: JERT-19-1017; doi: 10.1115/1.4042720 History: Received January 10, 2019; Revised January 11, 2019

Syngas has gained attention recently due to its high energy density and environmentally friendly characteristics. Flame stability plays an important role in flame propagation in energy conversion devices. Experimental studies were performed in a cylindrical chamber to investigate flame instability of syngas/air/diluent mixture. A Z-shape Schlieren system coupled with a high-speed complementary metal–oxide–semiconductor camera was used to record flame pictures up to 40,000 frames per second. In this research, syngas is a mixture of hydrogen and carbon monoxide and diluent is a blend of 14% CO2 and 86% N2 with the same specific heat as the burned gases. Three main flame instabilities namely Rayleigh–Taylor (body force) instability, hydrodynamic instability, and thermal-diffusive instability have been studied. For the onset of flame instability, a power law correlation for the ratio of critical pressure to initial pressure of syngas/air/diluent flames over a wide range of initial temperatures (298–450 K), initial pressures (1.0–2.0 atm), equivalence ratios (0.6–3.0), diluent concentrations (0–10%), and hydrogen percentages (5–25%) in the fuel has been developed.

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Figures

Grahic Jump Location
Fig. 3

Physical schematic of hydrodynamic instability [45]

Grahic Jump Location
Fig. 2

Physical schematic of Rayleigh–Taylor (body force) instability

Grahic Jump Location
Fig. 1

Overview of experimental facilities

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Fig. 4

Physical schematic of thermal-diffusive instability [45]

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Fig. 5

Schematic of the thermodynamic model

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Fig. 11

The ratio of critical pressure to initial pressure of syngas/air flames (5% hydrogen in the fuel) at different initial temperatures and initial pressure of 2 atm for various equivalence ratios

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Fig. 13

The ratio of critical pressure to initial pressure of syngas/air flames at initial temperatures of 450 K and initial pressure of 2 atm for various hydrogen percentages in the fuel and equivalence ratios

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Fig. 6

Images of the syngas/air flames with initial temperature of 298 K, hydrogen concentration of 25% for various equivalence ratios and initial pressures

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Fig. 7

Images of the syngas/air/diluent flames with initial temperature of 298 K, initial pressure of 1 atm, and hydrogen concentration of 25% for various equivalence ratios and diluent concentrations

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Fig. 8

Images of the syngas/air flames with initial pressure of 1 atm, hydrogen concentration of 25% for various equivalence ratios and initial temperatures

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Fig. 12

The ratio of critical pressure to initial pressure of syngas/air/diluent flames (5% hydrogen in the fuel) at initial temperatures of 298 K and initial pressure of 2 atm for various diluent concentrations and equivalence ratios

Grahic Jump Location
Fig. 9

The ratio of critical pressure to initial pressure of syngas/air flames (25% hydrogen in the fuel) at different initial temperatures and different initial pressures for various equivalence ratios

Grahic Jump Location
Fig. 10

The ratio of critical pressure to initial pressure of syngas/air flames (10% hydrogen in the fuel) at different initial temperatures and different initial pressures for various equivalence ratios

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