The effects of injector temperature on spray characteristics in heavy-duty diesel sprays

Paper #:
  • 2018-01-0284

Published:
  • 2018-04-03
Abstract:
This work investigates the impact of injector temperature on the characteristics of high-pressure n-dodecane sprays under conditions relevant to heavy-duty diesel engines. Sprays are injected from a pair of single-hole diesel injectors belonging to the family of “Spray C” and “Spray D” Engine Combustion Network (ECN) injectors. Low and high injector temperature conditions are achieved by activating or de-activating a cooling jacket. We quantify spray spreading angle and penetration using high-speed shadowgraph and long-distance-microscopy imaging. We evaluate differences in fuel/air mixture formation at key timings through one-dimensional modeling. Injections from a cooled injector penetrate faster than those from a higher temperature injector, especially for an injector already prone to cavitate (Spray C). When uncooled, Spray C exhibited a time-varying spreading angle at early times during the injection event, which exacerbates the reduction in initial penetration rate relative to the cooled injector. Changes in fuel density alone cannot account for the observed trends and we show that implementing a transient spreading angle in the model (guided by the time-sequenced images) is an effective solution to match experimental penetration characteristics. Time- and axially-resolved radial mixture fractions derived from the model reveal that operating a cavitation prone injector (Spray C) at higher temperatures may impact combustion performance.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$22.00
Mail
$22.00
Members save up to 36% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2017-07-26
Event
2018-04-10
Technical Paper / Journal Article
2011-05-17
Training / Education
2005-11-15
Training / Education
2007-03-01
Technical Paper / Journal Article
2011-05-17