Diesel engines without soot, that's the promise of a new fuel-injection design

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Thread: Diesel engines without soot, that's the promise of a new fuel-injection design

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    GMI Staff Member Premium Member nadepalma's Avatar
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    Diesel engines without soot, that's the promise of a new fuel-injection design

    Diesel engines without soot, that's the promise of a new fuel-injection design
    The technology also could help reduce NOx emissions
    JOEL STOCKSDALE
    Dec 19th 2019
    autoblog.com

    Diesel engines are extremely efficient and produce loads of useful torque, but they also produce much high levels of NOx emissions and soot and other particulates that are harmful to the environment and people, which has dimmed their prospects, particularly in the wake of the recent diesel emissions cheating scandal. But the folks at Sandia National Laboratories Combustion Research Facility may have a way to drastically reduce the diesel engine's pollutants, which could make diesel a more viable interim propulsion system again. The breakthrough lies in fuel-injector design.

    Sandia calls it ducted fuel injection, and compares the design to a Bunsen burner like you may have used in high school or college. How it works is that instead of the fuel injector spraying fuel straight into the open combustion chamber, there are ducts just outside the injector openings the fuel is sprayed through. The ducts are shaped such that as the fuel is sprayed into them, air is pulled in from the back of the ducts. You can see an excellent diagram of how the system works at Scientific American. This air and fuel mixes more thoroughly to get a better air-to-fuel ratio and subsequently much cleaner burning. In fact, Sandia claims that soot can be reduced by 50% to 100% depending on immediate conditions.

    That reduction in soot is impressive enough, but there are more benefits to be had. As Sandia explains, diesel engine manufacturers have an issue where reducing soot can result in an increase of NOx emissions, and vice versa. But if you were able to practically eliminate the soot issue with this injector design, manufacturers could then focus on tuning to eliminate NOx emissions in the combustion process.

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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Quote Originally Posted by nadepalma View Post
    Diesel engines without soot, that's the promise of a new fuel-injection design
    The technology also could help reduce NOx emissions
    JOEL STOCKSDALE
    Dec 19th 2019
    autoblog.com

    Diesel engines are extremely efficient and produce loads of useful torque, but they also produce much high levels of NOx emissions and soot and other particulates that are harmful to the environment and people, which has dimmed their prospects, particularly in the wake of the recent diesel emissions cheating scandal. But the folks at Sandia National Laboratories Combustion Research Facility may have a way to drastically reduce the diesel engine's pollutants, which could make diesel a more viable interim propulsion system again. The breakthrough lies in fuel-injector design.

    Sandia calls it ducted fuel injection, and compares the design to a Bunsen burner like you may have used in high school or college. How it works is that instead of the fuel injector spraying fuel straight into the open combustion chamber, there are ducts just outside the injector openings the fuel is sprayed through. The ducts are shaped such that as the fuel is sprayed into them, air is pulled in from the back of the ducts. You can see an excellent diagram of how the system works at Scientific American. This air and fuel mixes more thoroughly to get a better air-to-fuel ratio and subsequently much cleaner burning. In fact, Sandia claims that soot can be reduced by 50% to 100% depending on immediate conditions.

    That reduction in soot is impressive enough, but there are more benefits to be had. As Sandia explains, diesel engine manufacturers have an issue where reducing soot can result in an increase of NOx emissions, and vice versa. But if you were able to practically eliminate the soot issue with this injector design, manufacturers could then focus on tuning to eliminate NOx emissions in the combustion process.

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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Would this new injector design have any benefits for gasoline fuel injection on cars and trucks?
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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Quote Originally Posted by cadsrbest View Post
    Would this new injector design have any benefits for gasoline fuel injection on cars and trucks?
    No the reason for particulates in gasoline DI engines is due mainly to injectors firing against cold surfaces on initial start up. Gasoline particulates can be captures by low cost filters in the exhaust system that get periodic change. The use of dual PFI and DI overcomes many of the limitations an also acts as a detonation suppressant.

    I like this new diesel technology, especially the possibility of retrofitting to older diesels, it could be a good way of reforming diesels for industry and allowing manufacturers like Caterpillar to come back into on road diesel engines.
    Last edited by jpd80; 01-10-2020 at 04:11 PM.

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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Now that Murica is a net exporter of oil and the largest producer of oil in the world, these should be made widely available.

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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    is this anything like "Clean Coal"?
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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Quote Originally Posted by sdotjeezy View Post
    is this anything like "Clean Coal"?
    Do you mean "rolling coal", but without the soot? Yeah, I guess...
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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Diesels are incredibly efficient to begin with, but because they generate CO2, they're doomed. Very unfortunate.
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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    This will save the diesel. Period.

    Retrofitting fleets, rather than replacing them is a huge win.

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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    Quote Originally Posted by Chassis Guy View Post
    This will save the diesel. Period.

    Retrofitting fleets, rather than replacing them is a huge win.
    Not just fleets, but most importantly, independent operators. Small business owners would have the hardest time replacing a truck, especially if it had to be an insanely expensive electric truck.

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    Re: Diesel engines without soot, that's the promise of a new fuel-injection design

    The diesel filters have been a huge problem in the commercial industry. If this solves that, its a game changer.
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