Features of the Diffusion Combustion of Hydrogen Microjet at Various Spatial Orientation of the Nozzle Exit

Read more The purpose of the given work will consist in the experimental studies of features diffusion combustion of a hydrogen round microjet depending on spatial orientation of the nozzle exit. It is revealed, that a hydrogen round microjet at diffusion combustion in conditions of a jet velocity vector orientation towards terrestrial gravitation vector «g» (opposite or perpendicular) the basic characteristics of the flame evolution depending on a jet velocity are practically coincided. To these characteristics concern such as ranges of the «bottleneck» flame area presence, flame detachment at presence of the «bottleneck» flame area, presence of the «bottleneck» flame area, but absence of a turbulent jet combustion and finally ending of the microjet combustion. On the contrary, in situation of the hydrogen round microjet diffusion combustion in conditions of a jet velocity vector orientation towards terrestrial gravitation vector «g» (orientability – like) the basic characteristics of the flame evolution depending on a jet velocity are sharply differed from two previous cases. The range of existence of the «bottleneck» flame area is reduced, flame detachment occurs in absence of the «bottleneck» flame area and finally ending of the microjet combustion occurs at the much greater jet velocity.

Keywords:
hydrogen round microjet, diffusion combustion, «bottleneck» flame area, schlieren method, shadow patterns. 
УДК 544.452.42

Features of the Diffusion Combustion of Hydrogen Microjet at Various Spatial Orientation of the Nozzle Exit