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《2016-01-1041 Fuel-Air Mixing Characteristics of DI Hydrogen Jets》.pdf
2008-01-1041
Fuel-Air Mixing Characteristics of DI Hydrogen Jets
Rebecca Owston, Vinicio Magi and John Abraham
Purdue University
Copyright © 2008 SAE International
ABSTRACT prior to spark initiation in a spark-ignition (SI) engine.
Generally, local high temperature regions are responsible
The following computational study examines the structure for such occurrences.
of sonic hydrogen jets using inlet conditions similar to
those encountered in direct-injection hydrogen engines. Research efforts on optimization of DI hydrogen engines
Cases utilizing the same mass and momentum flux while are ongoing. Part of the issue with such engines is that
varying exit-to-chamber pressure ratios have been a number of properties of hydrogen are very different
investigated in a constant-volume computational domain. from those of conventional fuels. Thus, previous results
Furthermore, subsonic versus sonic structures have been from the existing body of literature on hydrocarbon fuel-
compared using both hydrogen and ethylene fuel jets. burning engines do not necessarily hold true when
Finally, the accuracy of scaling arguments to characterize considering hydrogen-air combustion. For example, the
an underexpanded jet by a subsonic “equivalent jet” has low ignition energy
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