Infrared images are used to characterize the atmospheric plasma and the influence of the liquid injection. In the infrared spectral range of low energies of the rotational vibrational transitions can be captured, which are emitted by hot liquid vapors. In addition, the combustion of organic liquids like ethanol and pentanol can be seen directly with an increase of the emitted radiation. The examination of the spray clouds suggests a correlation between Ohnesorge number and the spray angle. Lower Ohnesorge numbers lead to more focused vapor beams.

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