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Second, a reduced soot formation rate is apparent from the start of diffusion flame until the end of injection.
Finally, high soot oxidation rates occur after the end of injection and for the duration of the flame.
For the effect of the postinjection timing, the physical parameter found was the temperature of the unburned gases at the end of injection, Tug_Eo I
Ignition of pilot injection is controlled by glow plug to spray distance, by glow plug temperature and by fuel and air motion after the end of injection.
Two situations were tested, one in which the combustion started only after the end of injection (short and early injection) and one with a longer injection duration where injection and combustion partly overlapped in time.
The SA results are compared among the families to identify parameters that have 1st order impact on predicting CO2 storage ratio (SR) at two different time scales, i.e., end of injection and end of monitoring.
Similar(31)
This methodology relates ignition timescales during steady injection to mixing timescales after end-of-injection.
The study was explored by adjusting injection nozzle shape and location as well as end-of-injection timing (EOI).
Reasonable agreement between the predicted scaling and measured combustion recession data is shown over a very wide range of ambient conditions, injector parameters, and end-of-injection transients.
Combustion recession is the process whereby the initially lifted reaction zone retreats back towards the nozzle following end-of-injection thus consuming UHC that would otherwise remain near the nozzle and persist into the expansion stroke.
In an effort to link end-of-injection combustion transients to ambient thermodynamic conditions and injector parameters, a scaling methodology to predict the likelihood of combustion recession in diesel sprays was developed.
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