Volume 36 Issue 8
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ZHENG Weilin, ZHANG Shijie, PANG Liyao, XIE Fan, ZENG Wen. Effects of temperature and pressure on laminar flame characteristics of low heat value fuel[J]. Journal of Aerospace Power, 2021, 36(8): 1578-1585. doi: 10.13224/j.cnki.jasp.20200453
Citation: ZHENG Weilin, ZHANG Shijie, PANG Liyao, XIE Fan, ZENG Wen. Effects of temperature and pressure on laminar flame characteristics of low heat value fuel[J]. Journal of Aerospace Power, 2021, 36(8): 1578-1585. doi: 10.13224/j.cnki.jasp.20200453
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Effects of temperature and pressure on laminar flame characteristics of low heat value fuel

doi: 10.13224/j.cnki.jasp.20200453

  • 1. School of Aero-engine, Shenyang Aerospace University, Shenyang 110136, China;

  • 2. Shenyang Aircraft Design and Research Institute, Aviation Industry Corporation of China Limited, Shenyang 110035, China

  • Received Date: 2020-10-27
  • Publish Date: 2021-08-28
    Abstract
  • In order to illustrate the combustion characteristics of low heat value fuel under operation conditions of gas turbines, the laminar flame velocity of blast furnace gas, with volume fraction of 7%H2, 21. 72%CO, 21. 45%CO2, 49. 83%N2, was measured in a constant volume vessel, under initial pressures of 0. 10, 0. 15, 0. 20 MPa, initial temperatures of 303, 353, 403, 453 K, and equivalent ratios within the range of 0. 8~1. 6,in comparison with calculation results using the Gri-Mech 3. 0 kinetic mechanism. It was concluded that the laminar flame velocity of low heat value fuel increased with the decrease of the initial pressure and the increase of the initial temperature. The change of the laminar flame velocity was not monotonous and thus was fitted by high-order polynomials based on the experimental data. Further sensitivity analysis showed that the main reactions with positive sensitivities were R99 and R46,and the main reactions with negative sensitivities were R45 and R36,respectively. The laminar flame velocity was highly dependent on reactive free radicals,and affected by the competition between chain termination reactions and chain branching reactions. The mole fraction of active free radicals increased with the decrease of initial pressure and the increase of initial temperature, resulting in an increase in the laminar flame speed.

     

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