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...Ducted fuel injection for diesel engines, developed at Sandia National Lab's Combustion Research Facility by Charles Mueller, can fine-tune the fuel-air mixture in an engine to the point of eliminating between 50% to 100% of the soot typically generated by diesels. "And engine manufacturers are starting to show excitement about it," he says. Manufacturers like it because it cleans up the emissions, it work well with conventional diesel fuels, and it is conceptually simple and can be built from low-cost materials.
"Ducted fuel injection could also be retrofitted onto existing engines," Mueller says. "This is especially important for large engines, such as those used in ships and locomotives where the engines can cost $1 million or more and converting to all-electric power is cost-prohibitive. A retrofit would be relatively inexpensive and could provide substantial emissions benefits right away."...