Jing Ltd. products

In combustion, a diffusion flame is a flame in which the oxidizer, in our case the oxygen in the air combines with the fuel by diffusion. As a result, the flame speed is limited by the rate of diffusion. Diffusion flames tend to burn slower and to produce more soot than premixed flames because  there is not sufficient oxidizer within the flame.

A premixed flame is a flame in which the oxidizer has been mixed with the fuel before it reaches the flame front. This creates a thin flame front as all of the reactants are readily available. If the mixture is rich, a diffusion flame will generally be found further downstream.