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Structure and Concentration Decay in Supercritical Plane Hydrogen Jet

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Makarov, D. and Molkov, V. (2010) Structure and Concentration Decay in Supercritical Plane Hydrogen Jet. In: 8th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, Japan, Yokohama. Keio University, Yokohama, Japan. 11 pp. [Conference contribution]

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Abstract

The structure, axial concentration decay, and formation of flammable hydrogen-air mixture are studied numerically for a case of hydrogen release from a round nozzle and a plane nozzle with aspect ratio 200. Simulations of the underexpanded hydrogen jet structure for both circular and plane nozzles were conducted using the computational fluid dynamics in two stages: firstly from the nozzle across the shocks’ structure, and secondly downstream from the Mach disk to the far field. The results confirmed the phenomenon of “switching” axes known for plane jets of finite aspect ratio: the faster mixing in the plane of a minor axis makes the jet in this plane wider than in the plane of a major axis. The faster hydrogen-air mixing takes place only in the near field close to the nozzle. Downstream the plane nozzle jet structure tends to reproduce that of the axisymmetric jet. In the far field both plane and round nozzle jets resemble the similarity law for axial concentration decay in round jets.

Item Type:Conference contribution (Paper)
Keywords:Hydrogen safety, underexpanded jet, plane nozzle, axial concentration decay
Faculties and Schools:Faculty of Art, Design and the Built Environment
Faculty of Art, Design and the Built Environment > School of the Built Environment
Research Institutes and Groups:Built Environment Research Institute
Built Environment Research Institute > Hydrogen Safety Engineering and Research Centre (HySAFER)
ID Code:19747
Deposited By:Dr Dmitriy Makarov
Deposited On:22 Aug 2011 15:49
Last Modified:22 Aug 2011 15:49

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