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Characteristics of outwardly propagating spherical flames of R134a(C2H2F4)/CH4/O2/N2 mixtures in a constant volume combustion chamber

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  • Choi, Byung Chul
  • Park, June Sung
  • Ghoniem, Ahmed F.

Abstract

The characteristics of the outwardly propagating premixed flames of stoichiometric mixtures of R134a/CH4/O2/N2 have been experimentally investigated in a constant volume combustion chamber. Three regimes of the expanding flames were categorized based on the flame behavior. In the typical regime, a conventional outwardly propagating spherical flame was observed. The laminar burning velocity was correlated reasonably well as a function of the concentrations of oxygen and methane. When the concentration of R134a was relatively high, the buoyancy-induced regime, where the flame rises vertically while propagating outwardly, was observed. Phenomenological analysis in which the Richardson number and the Froude number were used to characterize the rising flames confirmed that the main cause of this phenomenon was buoyancy resulting from the difference between the densities of unburned and burned gases. The dimensionless velocity, which is based on the concept of the Damköhler number, explained the mechanism controlling the characteristic of the flame behavior. In addition, an intermediate transition regime existed between the two regimes.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:95:y:2016:i:c:p:517-527
    DOI: 10.1016/j.energy.2015.11.043
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    References listed on IDEAS

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    1. Choi, Byung Chul & Kim, Young Min, 2013. "Thermodynamic analysis of a dual loop heat recovery system with trilateral cycle applied to exhaust gases of internal combustion engine for propulsion of the 6800 TEU container ship," Energy, Elsevier, vol. 58(C), pages 404-416.
    2. Yang, Zhao & Wu, Xi & Tian, Tian, 2015. "Flammability of Trans-1, 3, 3, 3-tetrafluoroprop-1-ene and its binary blends," Energy, Elsevier, vol. 91(C), pages 386-392.
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    1. Nair, Aswathy & Velamati, Ratna Kishore & Kumar, Sudarshan, 2016. "Effect OF CO2/N2 dilution on laminar burning velocity of liquid petroleum gas-air mixtures at elevated temperatures," Energy, Elsevier, vol. 100(C), pages 145-153.
    2. Feng, Biao & Yang, Zhao & Zhai, Rui, 2017. "Experimental research on the concentration characteristics of R32 and R161′ combustion product HF," Energy, Elsevier, vol. 125(C), pages 671-680.
    3. 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.
    4. Sun, Zuo-Yu & Li, Guo-Xiu, 2016. "Propagation characteristics of laminar spherical flames within homogeneous hydrogen-air mixtures," Energy, Elsevier, vol. 116(P1), pages 116-127.
    5. Huang, Sheng & Zhang, Yu & Huang, Ronghua & Xu, Shijie & Ma, Yinjie & Wang, Zhaowen & Zhang, Xinhua, 2019. "Quantitative characterization of crack and cell's morphological evolution in premixed expanding spherical flames," Energy, Elsevier, vol. 171(C), pages 161-169.

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