Numerical Evaluation of the Performance of a Compression Ignition CNG Engine for Heavy Duty Trucks with an Optimum Speed Power Turbine

Authors

  • Alberto A. Boretti

Abstract

The turbocharged direct injection lean burn Diesel engine is the most efficient engine now in production for
transport applications. CNG is an alternative fuel with a better carbon to hydrogen ratio therefore permitting reduced
carbon dioxide emissions. It is injected in gaseous form for a much cleaner combustion almost cancelling some of
the emissions of the Diesel and it permits a much better energy security within Australia. The paper discusses the
best options currently available to convert Diesel engine platforms to CNG, with particular emphasis to the use of
these CNG engines within Australia where the refuelling network is scarce. This option is determined in the dual fuel
operation with a double injector design that couples a second CNG injector to the Diesel injector. This configuration
permits the operation Diesel only or Diesel pilot and CNG main depending on the availability of refuelling stations
where the vehicle operates. Results of engine performance simulations are performed for a straight six cylinder 13
litres truck engine with a novel power turbine connected to the crankshaft through a constant variable transmission
that may be by-passed when non helpful to increase the fuel economy of the vehicle or when damaging the
performances of the after treatment system.

Author Biography

Alberto A. Boretti

Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO, USA

References

Yeh S, “LCA for fuels regulation”. Workshop LCA of GHG emissions for transport fuels: Issues and implications for unconventional fuel sources, Calgary, Canada, September 2010. www.ipieca.org/system/files/event-materials /1050_-_IPIECA_Sept_14_2010_-Yeh_0.pdf [Internet][Cited December 15, 2011]

www.arb.ca.gov/fuels/lcfs/121409lcfs_lutables.pdf [Internet][Cited December 15, 2011]

www.supplychainvictoria.com.au/resources/4.WestportLNGPresentationMay09.pdf [Internet][Cited December 15,

www.westport-hd.com/technology.php [Internet][Cited December 15, 2011]

www.westport.com/core-technologies/fuel-injectors [Internet][Cited December 15, 2011]

Hodgins KB, Ouellette P, Hung P, Hill PG, “Directly Injected Natural Gas Fueling of Diesel Engines”. SAE P. 961671.

Mtui PL, Hill PG, “Ignition Delay and Combustion Duration with Natural Gas Fueling of Diesel Engines”. SAE

P.961933.

Kamel M et al, “An Emission and Performance Comparison of the Natural Gas Cummins Westport Inc. C-Gas Plus

Versus Diesel in Heavy-Duty Trucks”. SAE P. 2002-01-2737.

Harrington J et al, “Direct Injection of Natural Gas in a Heavy-Duty Diesel Engine”. SAE P. 2002-01-1630.

McTaggart GP et al, “The Effects of Varying EGR Test Conditions on a Direct Injection of Natural Gas Heavy-Duty

Engine with High EGR Levels”. SAE P. 2004-01-2955.

Goudie D et al, “Development of a Compression Ignition Heavy Duty Pilot-Ignited Natural Gas Fuelled Engine for Low

NOx Emissions”. SAE P. 2004-01-2954.

McTaggart GP et al, “Direct-Injected Hydrogen-Methane Mixtures in a Heavy-Duty Compression Ignition Engine”. SAE P. 2006-01-0653.

Brown S, Rogak S & Munshi S, “A new fuel injector prototype for heavy-duty engines has been developed to use direct-injection natural gas with small amounts of entrained diesel as an ignition promoter,” SAE P. 2009-01-1954.

International Journal of Engineering and Technology

Department of Energy, Energy efficiency and renewable energy, vehicle technology program,“FY 2008 Progress report

For Advanced combustion engine technologies”.

www1.eere.energy.gov/vehiclesandfuels/pdfs/program/2008_adv_combustion_engine.pdf [Internet][Cited December

, 2011]

Department of Energy, Energy efficiency and renewable energy, vehicle technology program “FY 2009 Progress report

For Advanced combustion engine research and development”.

www1.eere.energy.gov/vehiclesandfuels/pdfs/program/2009_adv_combustion_engine.pdf [Internet][Cited December

, 2011]

Gerdan D and Wetzler JM,”ALLISON V-1710 COMPOUNDED ENGINE”, SAE P. 480199.

Greszler A, “Diesel Turbo-compound Technology,” ICCT/NESCCAF Workshop Improving the Fuel Economy of

Heavy-Duty Fleets II, San Diego, CA, February 2008.

www.nescaum.org/documents/improving-the-fuel-economy-of-heavy-duty-fleets-1/greszler_volvo_session3.pdf/

[Internet][Cited December 15, 2011]

Wagner R et al, “Investigating Potential Light-duty Efficiency Improvements through Simulation of Turbo-compounding

and Waste-heat Recovery Systems”, SAE P. 2010-01-2209.

www.gtisoft.com/applications/a_Engine_Performance.php [Internet][Cited December 15, 2011]

liquegas.com/WPT-AHD_HPDI_Fuel_System_MED1.pdf [Internet][Cited December 15, 2011]

Boretti A, “ADVANTAGES OF THE DIRECT INJECTION OF BOTH DIESEL AND HYDROGEN IN DUAL FUEL

H2ICE”, International Journal of Hydrogen Energy, Vol. 36, pp. 9312-9317, 2011.

Boretti A, “ADVANCES IN HYDROGEN COMPRESSION IGNITION INTERNAL COMBUSTION ENGINES,”

International Journal of Hydrogen Energy, Vol. 36, pp. 12601-12606, 2011.

Boretti A, DIESEL-LIKE AND HCCI-LIKE OPERATION OF A TRUCK ENGINE CONVERTED TO HYDROGEN,

International Journal of Hydrogen Energy, Vol.36, pp. 15382-15391, 2011.

www.volvotrucks.com/trucks/global/en-gb/trucks/new-trucks/volvo_fh/engine-Program/Pages/intro.aspx

[Internet][Cited December 15, 2011]

Brockbank C and Cross D, “Mechanical hybrid system comprising a flywheel and CVT for motorsport and mainstream automotive applications,” SAE P. 2009-01-1312.

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Published

2011-10-01

How to Cite

[1]
A. A. Boretti, “Numerical Evaluation of the Performance of a Compression Ignition CNG Engine for Heavy Duty Trucks with an Optimum Speed Power Turbine”, Int. j. eng. technol. innov., vol. 1, no. 1, pp. 12–26, Oct. 2011.

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