Working fluid replacement in gaseous direct-injection internal combustion engines: A fundamental and applied experimental investigation

Miguel Sierra-Aznar*, Daniel I. Pineda, Bradley S. Cage, Xian Shi, Johnathan P. Corvello, Jyh Yuan Chen, Robert W. Dibble

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

Replacing air with argon theoretically allows for large thermal efficiency increases in internal combustion engines. Before such cycles can be realized, fundamental research on fuel injection into argon and laboratory-scale engine tests are needed. We investigated non-reacting methane jets into argon and nitrogen atmospheres in a constant volume chamber using high-speed schlieren imaging. We subsequently assessed the feasibility of methane direct-injection in a modified single cylinder research engine with an argon-oxygen mixture as the working fluid. We compared engine performance by measuring fuel flow, in-cylinder pressure, torque, and emissions. Results show that the penetration depth and spread angles of methane jets are notably different but not significantly reduced in argon compared to nitrogen. Additionally, running the modified engine with an argon-oxygen mixture in compression ignition operation leads to improvements in efficiency up to 50 percent relative to spark-ignited air cycles, and NOX emissions are nearly eliminated. The results encourage more studies in which the exhausted argon is recycled into the intake.

Original languageEnglish (US)
StatePublished - Jan 1 2017
Event10th U.S. National Combustion Meeting - College Park, United States
Duration: Apr 23 2017Apr 26 2017

Conference

Conference10th U.S. National Combustion Meeting
CountryUnited States
CityCollege Park
Period04/23/1704/26/17

Keywords

  • Compression ignition
  • Gaseous direct injection
  • Working fluid replacement

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Mechanical Engineering

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