Diffusion combustion of a hydrogen microjet emanating from a sphere enveloped in an air flow
V.V. Kozlov1,2, Yu.A. Litvinenko1, A.M. Sorokin1
1S.A. Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
2S.S. Kutateladze Institute of Thermophysics, Siberian Branch of the Russian Academy of Sciences, Novosibirsk, Russia
Keywords: diffusion combustion, air flow, thermal imager, wind tunnel, round hydrogen microjet, diffusion combustion, gravity acceleration vector, flame constriction region, shadow study method, shadow combustion patterns
Abstract
Experimental results on the diffusion combustion of a hydrogen microjet escaping from a sphere enveloped in an air flow are presented. Two limiting cases of the outflow of a burning hydrogen microjet are considered: when the jet is located at the flow divergence point on the sphere and at the opposite point, at the aft end of the sphere, where different separated flow structures are realized. Three characteristic hydrogen microjet flow velocity regimes were studied, allowing for the creation of various burning jet structures at zero incident flow velocity. The changes in the jet topology and structure were demonstrated. Flow visualization was performed using a thermal imager. A comparison was made with results obtained using a shadowgraph.
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