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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

CONCENTRATION PROFILES OF HIGH PRESSURE NOZZLE UNDEREXPANDED JET FLOWS IMPINGING OBSTACLES IN THE JET FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC16.cms.021773
pages 1687-1694

要約

Risk analyses of high pressure hydrogen storage systems have become a key concern for the commercialization of hydrogen energy in the transportation system. Current risk reduction measures include setting vertical plates around key components of the storage system to prevent gas leaks from spreading over very large areas. This research investigates the concentration profiles of high pressure underexpanded jet flows impinging on a vertical plate in the flow field using both experimental and numerical models. The flow along the ground is also important since the gas dispersion can be significantly expanded when flowing along a horizontal surface, such as the ground; thus, the flow concentrations are also investigated along a horizontal plate below the jet. Two simplified, reduced-order underexpanded jet flow models were used with the results validated against experimental data and simulation results obtained from full CFD models. The concentration profiles in front of the vertical plate decrease exponentially as the axial distance from the nozzle to the plate increases and in the radial direction on the plate. The gas concentrations along the horizontal plate centerline first increase and then decrease far from the nozzle. Both reduced-order models predict reasonable gas concentration profiles along the vertical plate but were not as accurate along the horizontal plate with much less time and computational resources than the full CFD model.