Looks like Turbo compound for diesel trucks is becoming off the
    shelf.

    http://www.voithturbo.de/vt_en_paa_road_motorenkomponente_turbocompound.htm


    "TurboCompound
    According to the European Exhaust Gas Norm Euro 5, from October
    2009, the
    borderline value for the emission of soot particles from heavy
    commercial
    vehicles will be set at 0.02 g/kWh. Nitric oxide emissions must not
    exceed a
    value of 2 g/kWh. It is assumed that from 2012, regulations will be
    even
    stricter with the introduction of Euro 6. Engine-related measures
    aiming at
    meeting this Euro 6 norm lead to increased fuel consumption. By
    utilizing the
    thermal energies occurring within the exhaust fumes, TurboCompound
    systems help
    to save up to 3 percent fuel. Consequently, CO2 emissions also drop.
    Voith Turbo
    supplies hydrodynamic couplings and pre-assembled systems for such
    TurboCompound
    systems."

    The 3% is an under estimation. DD claims 5%. Voith is not making the
    turbine
    apparently.

    Note the trade off between Nitric oxide emissions and fuel consumption.

    Also I'll bet that particle filter adds back pressure.

    Paul Lamar


Here is a new picture of the DD15 turbine. This will give us a good clue
of where to start when designing turbines for TC aircraft engines.
Detroit Diesel spent 1.5 billion U.S. developing this engine so I am sure the
turbine is some what optimized.

Also a heat balance chart for a truck diesel engine from Catapillar.


Paul Lamar

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