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Effect of additional diluents on flame propagation speed and markstein length in outwardly propagating premixed methane/ethylene–air flames

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Abstract

An experimental study was conducted to understand the effects of additional diluents (CO2 and He) on unstretched flame speed and Markstein length in outwardly propagating spherical premixed CH4/C2H4–air flames at normal temperatures and elevated pressures of up to 0.3 MPa. Laminar burning velocities were measured and compared with predicted ones using reliable reaction mechanisms. The data were first validated by testing linear and nonlinear extrapolation models for premixed methane–air flames. Unstretched laminar burning velocities were presented for premixed methane/ethylene–air flames diluted with CO2 and He on the basis of the optimized range of flame radius and extrapolation model. Three kinetic mechanisms were evaluated and compared with the measured data, and findings showed that Sung Mech was best fitted to the current unstretched flame speeds. Experimentally determined Markstein lengths were compared with theoretically predicted ones by considering the definitions of Lewis (heat-release-weighted, diffusion-based, and volumeweighted) and Zel’dovich numbers (based on a temperature-dependent one). The theoretical Markstein lengths based on a temperaturedependent Zel’dovich number and a heat-release-weighted effective Lewis number agreed best with the experimental data. The capability in predicting theoretical Markstein length with the model of Matalon was better than that with the model of Chen.

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Author information

Authors and Affiliations

  1. School of Mechanical Engineering, Pukyong National University, Busan, Korea

    Hee June Kim, Kyuho Van & Jeong Park

  2. Dept. of Aerospace Engineering, Sunchon National University, Sunchon, Korea

    Kee Man Lee

  3. Energy Efficiency and Materials Research Division, Korea Institute of Energy Research, Daejeon, Korea

    Dae Keun Lee & Young Tae Guahk

  4. Environment & Energy Research Division, Korea Institute of Machinery and Materials, Daejeon, Korea

    Sang In Keel

Authors
  1. Hee June Kim
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  2. Kyuho Van
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  7. Jeong Park
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Correspondence to Jeong Park.

Additional information

Recommended by Editor Yong Tae Kang

Hee Jun Kim obtained a bachelor’s degree at Pukyong National University. He is currently a master course student at Pukyong National University. His research interests include measurements of laminar flame speed, Markstein length, and cellular instability in outwardly propagating spherical flames.

Jeong Park acquired M.S. and Ph.D. degrees at KAIST and joined the Korea Aerospace Research Institute as a Senior Researcher. He is currently a Professor at Pukyong National University, the vicepresident of Korean Society of Combustion, and an editorial board member in Int. J. Spray & Combustion Dynamics.

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Kim, H.J., Van, K., Lee, K.M. et al. Effect of additional diluents on flame propagation speed and markstein length in outwardly propagating premixed methane/ethylene–air flames. J Mech Sci Technol 32, 5501–5509 (2018). https://doi.org/10.1007/s12206-018-1048-1

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  • DOI: https://doi.org/10.1007/s12206-018-1048-1

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