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Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes

Author

Listed:
  • Olga Gaidukova

    (Heat and Mass Transfer Simulation Laboratory, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia)

  • Pavel Strizhak

    (Heat and Mass Transfer Simulation Laboratory, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia)

Abstract

A model was developed to research the critical conditions and time characteristics of the ignition of gel fuels in the course of conductive, convective, radiant and mixed heat transfer. MATLAB was used for numerical modeling. Original MATLAB code was established pursuant to the developed mathematical model. For gel fuel ignition at initial temperatures corresponding to cryogenic storage conditions with different heating schemes, a numerical analysis of interconnected processes of heat and mass transfer in the chemical reaction conditions and exothermic and endothermic phase transitions was conducted. The model was tested by comparing the theoretical results with the experimental data. Dependencies were established between the key process characteristic (i.e., the ignition delay time) and the ambient temperature when the following parameters were varied: emissivity, heat emission coefficient, activation energy and pre-exponential factor of the fuel vapor oxidation reaction. The critical values of the main parameters of the energy source were determined. For these values, gel fuel ignition conditions were consistently realized for each heating scheme. The critical heat fluxes necessary and sufficient for the ignition of typical gel fuels were determined.

Suggested Citation

  • Olga Gaidukova & Pavel Strizhak, 2021. "Critical Conditions for the Ignition of a Gel Fuel under Different Heating Schemes," Energies, MDPI, vol. 14(21), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7083-:d:668235
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    References listed on IDEAS

    as
    1. Jonghan Won & Seung Wook Baek & Hyemin Kim & Hookyung Lee, 2019. "The Viscosity and Combustion Characteristics of Single-Droplet Water-Diesel Emulsion," Energies, MDPI, vol. 12(10), pages 1-12, May.
    2. Qin-Liu Cao & Wei-Tao Wu & Wen-He Liao & Feng Feng & Mehrdad Massoudi, 2020. "Effects of Temperature on the Flow and Heat Transfer in Gel Fuels: A Numerical Study," Energies, MDPI, vol. 13(4), pages 1-17, February.
    3. Zejun Liu & Xiaoping Hu & Zhen He & Jianjun Wu, 2012. "Experimental Study on the Combustion and Microexplosion of Freely Falling Gelled Unsymmetrical Dimethylhydrazine (UDMH) Fuel Droplets," Energies, MDPI, vol. 5(8), pages 1-11, August.
    4. Sun, Daoan & Cai, Wenzhe & Li, Chunying & Lu, Jian, 2021. "Experimental study on atomization characteristics of high-energy-density fuels using a fuel slinger," Energy, Elsevier, vol. 234(C).
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