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Research Papers: Fuel Combustion

Measurement of Laminar Burning Speeds and Investigation of Flame Stability of Acetylene (C2H2)/Air Mixtures

[+] Author and Article Information
Emad Rokni, Ali Moghaddas, Omid Askari, Hameed Metghalchi

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

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 6, 2014; final manuscript received August 11, 2014; published online September 3, 2014. Assoc. Editor: Reza H. Sheikhi.

J. Energy Resour. Technol 137(1), 012204 (Sep 03, 2014) (6 pages) Paper No: JERT-14-1241; doi: 10.1115/1.4028363 History: Received August 06, 2014; Revised August 11, 2014

Laminar burning speeds and flame structures of spherically expanding flames of mixtures of acetylene (C2H2) with air have been investigated over a wide range of equivalence ratios, temperatures, and pressures. Experiments have been conducted in a constant volume cylindrical vessel with two large end windows. The vessel was installed in a shadowgraph system equipped with a high speed CMOS camera, capable of taking pictures up to 40,000 frames per second. Shadowgraphy was used to study flame structures and transition from smooth to cellular flames during flame propagation. Pressure measurements have been done using a pressure transducer during the combustion process. Laminar burning speeds were measured using a thermodynamic model employing the dynamic pressure rise during the flame propagation. Burning speeds were measured for temperature range of 300–590 K and pressure range of 0.5–3.3 atm, and the range of equivalence ratios covered from 0.6 to 2. The measured values of burning speeds compared well with existing data and extended for a wider range of temperatures. Burning speed measurements have only been reported for smooth and laminar flames.

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Figures

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Fig. 1

Z-type shadowgraph ensemble with a high speed CMOS camera

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Fig. 2

Snapshots of C2H2–air flames at three different equivalence ratios, Ti = 298 K, Pi = 0.5 atm

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Fig. 3

Snapshots of C2H2–air flames at three different equivalence ratios, Ti = 298 K, Pi = 1 atm

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Fig. 4

Schematic of different zones and their corresponding temperatures in the thermodynamics model

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Fig. 5

Unburned gas initial conditions along an isentrope for ϕ = 0.8

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Fig. 6

Laminar burning speed versus stretch rate for C2H2

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Fig. 7

Laminar burning speeds and flame temperatures of C2H2–air flames for different equivalence ratios, Ti = 298 K, Pi = 1 atm

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Fig. 8

Laminar burning speeds of C2H2–air flames for different equivalence ratios, Ti = 298 K, Pi = 0.5 atm

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Fig. 9

Laminar burning speeds of C2H2–air flames for different equivalence ratios, Ti = 350 K, Pi = 0.5 atm

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Fig. 10

Laminar burning speeds of C2H2–air flames for different equivalence ratios, Ti = 475 K, Pi = 0.5 atm

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Fig. 11

Laminar burning speeds of C2H2–air flames for different equivalence ratios, Ti = 298 K, Pi = 1 atm

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Fig. 12

Laminar burning speeds of C2H2–air flames for different equivalence ratios, Ti = 350 K, Pi = 1 atm

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Fig. 14

Comparison of C2H2–air mixtures mass burning rates for three different equivalence ratios

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Fig. 13

Comparison of C2H2–air mixtures laminar burning speeds with other literatures for atmospheric condition

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