The Study of Thermal Characteristics for the Inverse Diffusion Flame in Atmospheric Environment

Le résumé fourni par la source

To address the thermal regulation challenges in inverse diffusion combustion, this study quantifies the interdependent evolution of temperature fields and thermal radiation through a novel dual-nozzle burner system with different propane velocities (0.4–2.9 m/s) and central air velocities (0–31.8 m/s). The influence of the central airflow on axial temperature distribution and thermal radiation pattern of the inverse diffusion flame has been investigated. The maximum temperature of inverse diffusion flame is directly proportional to the central air flow, while the thermal radiation is inversely proportional to the air flow. Air entrainment rate is an important reason for the increase in flame temperature. The air entrainment rate increases with the increase in the air flow speed when the air Reynolds number is larger than 2300. A dimensionless correlation of flame temperature distribution in the plume region was established based on the air entrainment coefficient. The thermal radiation evolution of the inverse diffusion flame was analyzed based on the soot generation theory, and a mathematical model between thermal radiation, air flow, and heat release rate of inverse diffusion flame has been developed. These findings provide critical theoretical support for optimizing high-intensity industrial inverse diffusion flame burner, particularly advancing clean combustion technology in energy-intensive applications.

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