COMBUSTION OF THE ROUND MICROJET OF HYDROGEN WITH OXYGEN MIXTURE EFFLUX FROM THE CURVED MICRONOZZLE

Read more The purpose of this work consists in experimental study of combustion features of the round microjet premixed hydrogen with oxygen. Situation of the microjet efflux and combustion of hydrogen/oxygen mixture from a curved micronozzle with a top-hat mean velocity profile at the nozzle exit is considered. It is shown that addition of oxygen leads to decrease in velocity range of existence of a microjet combustion in comparison with similar parameter at diffusion combustion of a pure hydrogen. It is found that with growth of a microjet velocity efflux, the combustion termination of its is connected with reduction of an oxygen part in mixture. Existence of spherical «bottleneck flame region» is revealed. Its region deformed under influence of the Dean and Kelvin – Helmholtz vortices. «Bottleneck flame region» size is reduced with growth of a microjet velocity efflux. It is shown that the area of a turbulent flame is also is subjected to distortion from influence of the Dean and Kelvin – Helmholtz vortices. It is found that the range of the round microjet combustion both pure hydrogen, and its mixture with oxygen efflux from a curved micronozzle is much wider than the range of the round microjet combustion both pure hydrogen, and its mixture with oxygen efflux from a linear micronozzle.

Keywords:
round microjet, hydrogen / oxygen mixture combustion, «bottleneck flame region», shadow method of a research, combustion shadow patterns, curved micronozzle.
УДК 544.452.42

COMBUSTION OF THE ROUND MICROJET OF HYDROGEN WITH OXYGEN MIXTURE EFFLUX FROM THE CURVED MICRONOZZLE