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Numerical Investigation on the Flame Characteristics of Lean Premixed Methane Flame Piloted with Rich Premixed Flame

Author

Listed:
  • Lili Zhang

    (School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China)

  • Yongzhang Cui

    (School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China)

  • Pengfei Yin

    (School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China)

  • Wenlong Mao

    (Shandong Special Equipment Inspection Institute Group Co., Ltd., Jinan 250101, China)

  • Pengzhao Zhang

    (School of Thermal Engineering, Shandong Jianzhu University, Jinan 250101, China)

Abstract

The introduction of the pilot flame can stabilize the lean premixed flame and promote its industrial application. However, the interaction mechanism between the pilot and main flames is complicated. To reveal the effect of the pilot flame on the main flame, a laminar lean premixed flame adjacent to a rich premixed pilot flame on one side and a similar lean premixed flame on the other side was considered. A two-dimensional numerical model was adopted with detailed chemistry and species transport, also with no artificial flame anchoring boundary conditions. The results show that the pilot flame could promote the main flame stabilized in different locations with various shapes, by adjusting the stretch, heat transfer, and preferential diffusion in a complicated manner. The pilot flame improves the local equivalence ratio and transfer more heat to the main flame. The growth of the pilot flame equivalence ratio and inlet velocity enhances the combustion on the rich side of the main flame and helps it anchor closer to the flame wall. Both the curvature and strain rate show a significant effect on the flame root, which contributes to the main flame bending towards the pilot flame.

Suggested Citation

  • Lili Zhang & Yongzhang Cui & Pengfei Yin & Wenlong Mao & Pengzhao Zhang, 2024. "Numerical Investigation on the Flame Characteristics of Lean Premixed Methane Flame Piloted with Rich Premixed Flame," Energies, MDPI, vol. 17(14), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:14:p:3430-:d:1433652
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