What are the Methods for Stabilizing Radiation Flow Diffusion Flame?
What are the Methods for Stabilizing Radiation Flow Diffusion Flame?
Like the homogeneous flame, radiation flow diffusion flame can be stabilized by using a flow circulation zone and a return flow zone. Generally speaking, stabilizing flame measures can include several methods.
① At the nozzle interface, the combustion rate of the fuel jet and the airflow velocity balance to stabilize the flame This is to form a mixture close to the theoretical molar ratio on the boundary layer between the fuel jet and the surrounding air, and when the combustion rate and local airflow velocity balance, the flame can be stabilized. Experimental results show that in low flow velocity and low-turbulent airflow, the turbulent flow diffusion flame can be formed at the interface, but in high-turbulent airflow, if the flame size formed at the nozzle outlet is large, its turbulent combustion rate may be balanced with the local flow velocity, so the flame may be stabilized. However, the flame stability is not good, as it is easy to cause flame detachment and extinguishment when the flow velocity changes or there is periodic pulsation. Therefore, in practical applications, both the above methods are used to stabilize the flame.
② By using the airflow circulation zone and return flow zone behind the nozzle edge to stabilize the flame When the nozzle edge has a certain thickness, the airflow exiting the nozzle will form a circulation zone behind the nozzle edge. By utilizing the airflow circulation effect, the flame can be stabilized in a wide range of flow velocity. In practical applications, the above two methods are used to stabilize the flame.