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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations


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)
Title of host publication10th U.S. National Combustion Meeting
PublisherEastern States Section of the Combustion Institute
StatePublished - Jan 1 2017

Bibliographical note

KAUST Repository Item: Exported on 2021-01-06
Acknowledgements: The research was funded in part by the California Energy Commission: Energy Innovations Small
Grant No. 5804A/14-07G, and by the King Abdullah University of Science and Technology, Subaward Agreement Ref. No. OSR-2016-CPF-2909-02. The construction of the experiment was
made possible by the donation of fuel injection and piping equipment by Bosch and Parker Hannifin, respectively. The authors thank Charles Scudiere for setting up and running the CONVERGE
simulations. The authors would like to acknowledge Michael Neufer and Alex Jordan of the Technical and Instructional Support Group of the Department of Mechanical Engineering for their expertise in assembling and operating the Cooperative Fuel Research engine. MSA also wishes
to thank Malte Schafer for his assistance in the construction of the engine, Tim Sennott for his ¨
help during the injection experiments and Florian Courbin for his help manufacturing the injector
adapters. DIP thanks Jordan Yvette Nerison for the final illustration in Figure 1.


Dive into the research topics of 'Working fluid replacement in gaseous direct-injection internal combustion engines: A fundamental and applied experimental investigation'. Together they form a unique fingerprint.

Cite this