CH4/air
H2/O2
C2H2/O2
Investigated Flames
For the measurements of the excitation emission spectra 3 different types of flames are used: a methane/air flame, a hydrogen/oxygen flame and a acetylene/oxygen flame. The methane/air flame is produced using a commercial Bunsen burner, flame diameter of about 30 mm and flame length about 110 mm. The hydrogen/oxygen mixture is burnt with a commercial welding torch, flame diameter about 7 mm and flame length about 250 mm. Also the acetylene/oxygen mixture is burnt with a welding torch. Here the flame diameter is about 10 mm and the flame height is about 200 mm. For the measurements the height of the inner cone of the acetylene/oxygen flame varries between 10 mm and about 120 mm.
The hydrogen/oxygen and acetylene/oxygen flames of a welding torch offer the advantage of much higher temperature and correspondingly larger OH and NO densities. Combustion took place at ambient pressure and air/fuel ratios above 1.
| methane/air flame of a Bunsen
burner
CH4/air |
hydrogen/oxygen flame of a welding
torch
H2/O2 |
acetylene/oxygen flame of a
welding torch
C2H2/O2 |
|
|
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