Behavior of buoyancy and momentum controlled hydrogen jets and flames emitted into quiescent atmosphere
- Behavior of buoyancy and momentum controlled hydrogen jets and flames emitted into quiescent atmosphere
- 김종수; 양원; 김영규; 원상희
- hydrogen; Jets; Dispersion; Buoyancy; Flammable distance
- Issue Date
- Journal of loss prevention in the process industries
- VOL 22, NO 6, 943-949
- As an effort to improve the prediction of hydrogen dispersion in the atmosphere, effects of buoyancy
acting on the hydrogen jets formed by releasing from high pressure vessels are investigated analytically
and experimentally. For the analytical study, an integral analysis for buoyant jets and flames is carried
out to yield the closed formula describing the jet and flame shapes, including their trajectory and
horizontal and vertical lengths corresponding to the critical concentrations. Because the density of
hydrogen after releasing from high pressure storage conditions is much close to that of helium than that
of hydrogen at room temperature, helium is used as the hydrogen surrogate for the buoyant jet experiments,
which were performed by visualizing the jet dispersing in the atmosphere up to the jet Reynolds
number Re - 2400. The trajectories obtained by the integral analysis and experiments agree relatively
well until the transition to turbulence occurs. A further estimate for jets and flames is made by using the
integral analysis as a preliminary design to the experiments involving a much greater hydrogen release.
Once the comparative investigation of the larger scale experiments with the integral analysis, we
anticipate that a more universal hydrogen jet and flame data can be obtained, which perhaps leads to
a better safety distance of hydrogen stations.
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