The Diesel Technology Forum — a non-profit group that works to raise awareness about the environmental progress of diesel engines — has reported that ultra-low sulfur diesel (ULSD) fuel has become widely available at fueling stations nationwide. The development has calmed concerns over the availability and performance of the fuel for heavy-duty trucks designed specifically for ULSD.
More than 93 million gal of ULSD were refined in July 2007, up from 54 million barrels during July last year. ULSD now accounts for 75 percent of all distillate fuel production. The EPA estimates that 90 percent of all retail service stations that have diesel fuel are now carrying ULSD, exceeding the 80 percent minimum level. Over the last year, 838 million barrels of clean diesel have entered the U.S. distribution system.
A bold, gold, open-air coupe may not be the ticket to automotive nirvana for every consumer, but Lexus’ LF-C2 concept car certainly turned heads at the recent Los Angeles Auto Show. What’s more, it may provide a glimpse of the luxury automaker’s future.
The complexity of diesel engines means optimizing their performance requires a large amount of experimentation. Computational fluid dynamics (CFD) is a very useful and intuitive tool in this, and cold flow analysis using CFD is an ideal approach to study the flow characteristics without going into the details of chemical reactions occurring during the combustion.
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