Structure and Concentration Decay in Supercritical Plane Hydrogen Jet

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.
LanguageEnglish
Title of host publicationUnknown Host Publication
Pages1-11
Number of pages11
Publication statusPublished - 5 Sep 2010
Event8th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions - Japan, Yokohama
Duration: 5 Sep 2010 → …

Conference

Conference8th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions
Period5/09/10 → …

Fingerprint

nozzles
jet nozzles
decay
hydrogen
far fields
aspect ratio
air
computational fluid dynamics
near fields
shock
simulation

Keywords

  • Hydrogen safety
  • underexpanded jet
  • plane nozzle
  • axial concentration decay

Cite this

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title = "Structure and Concentration Decay in Supercritical Plane Hydrogen Jet",
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.",
keywords = "Hydrogen safety, underexpanded jet, plane nozzle, axial concentration decay",
author = "D. Makarov and V. Molkov",
year = "2010",
month = "9",
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language = "English",
pages = "1--11",
booktitle = "Unknown Host Publication",

}

Makarov, D & Molkov, V 2010, Structure and Concentration Decay in Supercritical Plane Hydrogen Jet. in Unknown Host Publication. pp. 1-11, 8th International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions, 5/09/10.

Structure and Concentration Decay in Supercritical Plane Hydrogen Jet. / Makarov, D.; Molkov, V.

Unknown Host Publication. 2010. p. 1-11.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

TY - GEN

T1 - Structure and Concentration Decay in Supercritical Plane Hydrogen Jet

AU - Makarov, D.

AU - Molkov, V.

PY - 2010/9/5

Y1 - 2010/9/5

N2 - 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.

AB - 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.

KW - Hydrogen safety

KW - underexpanded jet

KW - plane nozzle

KW - axial concentration decay

M3 - Conference contribution

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EP - 11

BT - Unknown Host Publication

ER -