21st Century Locomotive Technology: Quarterly Technical Status Report 17 DOE/AL68284-TSR17 Page: 2 of 4
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21st Century Locomotive Technology: Quarterly Technical Status Report 17
Task 1: Advanced Fuel Injection
Develop and demonstrate an advanced fuel injection system to minimize fuel consumption,
while meeting Tier 2 emissions levels.
Progress since last report
Over the first quarter of 2007, we continued engine performance testing with the common
rail fuel system on GE Global Research's locomotive single cylinder engine. We showed that
further improvements in fuel consumption at T2 NOx values could be achieved with the
common rail system. However, we have found that the injection strategies that give the best
fuel consumption have the risk of increased PM emissions. Our goal is optimizing the nozzle
geometry to maximize the SFC benefit (at constant NOx level) while maintaining the
particulate matter below regulation levels.
Overall, our work over the last quarter has been centered on nozzle optimization for a new
piston bowl design. Geometry factors that have been explored include number of holes and
nozzle flow. In addition to these geometrical variants, we explored the effect of nozzle
needle opening and closing rate.
There are three main accomplishments in the area of advanced fuel injection over the last
1. Completed study to examine the effect of injector needle raise and fall rate.
2. Investigated the effect of number of nozzles holes.
3. Investigated the effect of flow area.
Some of these results were not conclusive because of an unintended change in nozzle
sac volume for some test series. Replacement nozzles are currently being
manufactured to repeat selected experiments with the correct nozzle sac volume.
Performed an engine performance study to explore the effect of rate of injector
needle raise and fall: By changing geometry details in the fuel injector (needle seat and
orifice plate) the needle raise and fall rate can be modified. A study was performed to
investigate four different configurations of lifting and falling rate of the common rail fuel
injector needle. Trends have been identified as to how the needle raise and fall rate
affects the fuel consumption and emissions characteristics.
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Salasoo, Lembit & Topinka, Jennifor. 21st Century Locomotive Technology: Quarterly Technical Status Report 17 DOE/AL68284-TSR17, report, May 21, 2007; United States. (digital.library.unt.edu/ark:/67531/metadc882190/m1/2/: accessed July 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.