Influence of charge motion and compression ratio on the performance of a combustion concept employing in-cylinder gasoline and natural gas blending

[+] Author and Article Information
James Sevik

Argonne National Laboratory

Michael Pamminger

Illinois Institute of Technology

Thomas Wallner

Argonne National Laboratory

Riccardo Scarcelli

Argonne National Laboratory

Steven Wooldridge

Ford Motor Company

Brad Boyer

Ford Motor Company

Scott Miers

Michigan Technological University

Carrie Hall

Illinois Institute of Technology

1Corresponding author.

ASME doi:10.1115/1.4040090 History: Received February 07, 2018; Revised March 15, 2018


The present paper represents a small piece of an extensive experimental effort investigating the dual-fuel blending operation of a light-duty spark ignited engine. Natural gas (NG) was directly injected into the cylinder and gasoline was injected into the intake-port. Direct injection of NG was used in order to overcome the power density loss usually experienced with NG port-fuel injection as it allows an injection after intake valve closing. EGR was used to increase efficiency at low and part-load operation and reduce the propensity of knock at higher compression ratios (CR) thereby enabling blend levels with greater amount of gasoline across a wider operating range. CR and in-cylinder turbulence levels were varied in order to study their influence on efficiency, emissions and performance over a specific speed and load range. Increasing the CR from 10.5 to 14.5 allowed an absolute increase in indicated thermal efficiency of more than 3% for 75% NG (25% gasoline) operation at 8 bar IMEP and 2500 RPM. However, the achievable peak load at CR 14.5 with 100% gasoline was reduced due to its lower knock resistance. The in-cylinder turbulence level was varied by means of tumble plates as well as an insert for the NG injector that guides the injection "spray" to augment the tumble motion. The usage of tumble plates showed a significant increase in EGR dilution tolerance for pure gasoline operation, however, no such impact was found for blended operation of gasoline and NG.

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