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An experimental study on coflow diffusion combustion in a pellet-packed bed with different bed lengths.

Junrui Shi1, Yang Liu2, Yongqi Liu1

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Summary

This study investigated methane-air diffusion combustion in a packed bed, finding that bed length and pellet size significantly alter flame characteristics. The combustion can transition from non-premixed to premixed, influencing flame temperature and stability.

Keywords:
bed lengthdiffusion flameflame heightflame shapeoscillation

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Area of Science:

  • Combustion Science
  • Chemical Engineering
  • Fluid Dynamics

Background:

  • Packed beds are used in various industrial processes, including combustion.
  • Understanding flame behavior in packed beds is crucial for optimizing efficiency and safety.
  • Axial symmetry in flames is a key characteristic in confined combustion systems.

Purpose of the Study:

  • To experimentally investigate the influence of packed bed characteristics on methane-air diffusion flame properties.
  • To analyze flame height, shape, and stability under varying conditions.
  • To explore the transition of combustion regimes within a packed bed.

Main Methods:

  • Experimental setup using a quartz tube combustor packed with alumina pellets.
  • Controlled introduction of a methane fuel stream surrounded by coflow air.
  • Observation and analysis of flame characteristics, including shape, color, and stability.

Main Results:

  • Flame properties are significantly influenced by packed bed length and pellet diameter.
  • Flames exhibit axial symmetry, with shape and color varying with bed length.
  • Observed flame front color changes indicate increased temperature and potential shifts from non-premixed to premixed combustion.

Conclusions:

  • Packed bed geometry plays a critical role in dictating flame behavior and combustion regimes.
  • The mix and dispersion effects within the packed bed promote changes in combustion characteristics.
  • Unusual flame phenomena like inclined fronts and oscillatory motion were observed and discussed.