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SUMMARY:Mixing dynamics in pulsed fuel jets - Dr Edward Richardson\, Unive
 rsity of Southampton
DTSTART:20150529T120000Z
DTEND:20150529T130000Z
UID:TALK58271@talks.cam.ac.uk
CONTACT:Antoine Debugne
DESCRIPTION:The effects of split-injection on the mixing and the fluid res
 idence time distribution in turbulent gaseous jets are investigated using 
 Direct Numerical Simulation (DNS).  The mixing physics identified in this 
 study are important for the understanding of split-injection compression-i
 gnition engine operation\, in which mixing rates and fuel residence time c
 ontrol the rate of heat release and pollutant formation.  The configuratio
 n involves a round turbulent jet issuing from a flat plate\, subject to si
 ngle-pulse\, double-pulse\, and continuous injection. A novel analysis of 
 fluid residence time is performed by solving a transport equation for the 
 fluid age. A similarity scaling is determined for the residence time in th
 e continuous jet case. It is then shown that the radial gradients of the a
 ge of injected fluid are greater in the continuous jet suggesting that\, i
 n continuous fuel injection\, entrainment of older more-reacted fluid prov
 ides a mechanism to promote ignition further upstream compared to pulsed j
 ets. The implications of scalar dissipation and entrainment rate transient
 s for combustion are discussed.
LOCATION:LR5\, Inglis Building\, CUED.
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