Diffusion flame

Under diffusion flame is defined as the flame of a Bunsen burner that burns without Luftvormischung. The oxygen required for combustion - like all other air units - diffuse across the border into flames in the flame, so the flame is supplied to the flame core towards getting worse with oxygen. Therefore, in the core of the fuel burns only in part.

Are diffusion flames because of the high unburned portions which can be seen in the strong carbon blacks of the flames used in industry only as pilot light and in everyday life as a candle flame. Earlier oil stoves were also working on this principle; however, this is technically outdated.

Subregions

The diffusion flame can be divided into three sections:

• A cold area at the beginning of the combustion range, ie in the region in the immediate vicinity of the gas or oil spill. In this range, no significant reaction takes place, the flame kernel is made of unburnt gas, or oil.
• The second area is called the radiant, glowing in him by the heat of the Flammensaumes split from the hydrocarbon carbon with yellow color. Therefore, one also speaks of a yellow flame.
• The third area is the outer, hot flames border where the exothermic combustion reaction takes place to form carbon dioxide and water vapor.

Premixed flame

The opposite of a diffusion flame is also referred to as premix. Here, the fuel, the oxygen is already pre- mixed, making the combustion more complete and thus run hotter can. In addition, a significant increase in noise observed.

Teilvormischflamme

Intermediate species of the diffusion flame and the premixed flame are called Teilvormischflammen.

• Combustion theory