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Burning velocities of DME(dimethyl ether)-air premixed flames at elevated temperatures

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  • Varghese, Robin John
  • Kishore, V. Ratna
  • Akram, M.
  • Yoon, Y.
  • Kumar, Sudarshan

Abstract

This paper reports the measurement of laminar burning velocities of DME (dimethyl ether)-air mixtures at higher mixture temperatures using planar flames stabilized in a controlled temperature mesoscale diverging channel. The reliability of this technique for flame speed measurement at high mixture temperatures has been established through various numerical studies using detailed 3-D computational model for DME-air mixtures. The distribution of fuel-air mass flux, reaction zone, and flame shape indicate that a planar flame is indeed formed in both transverse and depth directions of the channel. The stabilized flame is independent of any stretch effects except mild hydrodynamic strain due to channel divergence (30-50 s−1), and measured values of laminar burning velocities are within ±5% of the actual value. The experiments were carried out at various equivalence ratios (ϕ = 0.7–1.4) and elevated mixture temperatures (350–640 K). The burning velocities and temperature exponents were determined using the planar flames stabilized at different mixture inlet velocities and temperatures. Slightly rich mixtures (ϕ = 1.1) point to the maximum burning velocity, in good agreement with recent literature at ambient conditions. Temperature exponents for different equivalence ratios increase to both sides of ϕ = 1.1. Numerically calculated laminar burning velocities with different chemical kinetic schemes compared well with the measured burning velocities at higher mixture temperatures.

Suggested Citation

  • Varghese, Robin John & Kishore, V. Ratna & Akram, M. & Yoon, Y. & Kumar, Sudarshan, 2017. "Burning velocities of DME(dimethyl ether)-air premixed flames at elevated temperatures," Energy, Elsevier, vol. 126(C), pages 34-41.
    • Handle: RePEc:eee:energy:v:126:y:2017:i:c:p:34-41
    DOI: 10.1016/j.energy.2017.03.004
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    References listed on IDEAS

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    1. Choi, Byung Chul & Park, June Sung & Ghoniem, Ahmed F., 2016. "Characteristics of outwardly propagating spherical flames of R134a(C2H2F4)/CH4/O2/N2 mixtures in a constant volume combustion chamber," Energy, Elsevier, vol. 95(C), pages 517-527.
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    3. Veeraragavan, Ananthanarayanan, 2015. "On flame propagation in narrow channels with enhanced wall thermal conduction," Energy, Elsevier, vol. 93(P1), pages 631-640.
    4. Hu, Xianzhong & Yu, Qingbo & Liu, Junxiang & Sun, Nan, 2014. "Investigation of laminar flame speeds of CH4/O2/CO2 mixtures at ordinary pressure and kinetic simulation," Energy, Elsevier, vol. 70(C), pages 626-634.
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    2. Zhang, Yi & Kang, Yinhu & Lu, Xiaofeng & Wang, Quanhai, 2023. "Numerical study of combustion mode and diffusive transport underlying fuel ignitions in lean stratified dimethyl ether-air premixture at various turbulence intensities," Energy, Elsevier, vol. 280(C).

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