An Experimental Investigation on the Combustion Process of a Simulated Turbocharged SI Natural Gas Engine Operated on Stoichiometric Mixture

[+] Author and Article Information
Hailin Li

West Virginia University

Timothy Gatts

West Virginia University

Shiyu Liu

West Virginia University

Scott Wayne

West Virginia University

Nigel N. Clark

West Virginia University

Daniel Mather

Digital-Engines, LLC, Wisconsin

1Corresponding author.

ASME doi:10.1115/1.4038692 History: Received November 26, 2016; Revised October 01, 2017


This research investigated the combustion process of an AVL Model LEF/Volvo 5312 single cylinder engine configured to simulate the operation of heavy-duty spark ignition (SI) natural gas engine operated on stoichiometric mixture. The factors affecting the combustion process examined include intake pressure, spark timing, and the addition of diluents including N2 and CO2 to natural gas simulating low BTU gases. The mixing of diluents with natural gas is able to slow down the flame propagation speed, suppress the onset of knock, and allow the engine to operate on higher boost pressure for higher power output. The addition of CO2 was more effective than N2 in suppressing the onset of knock and the propagation speed due to its high heat capacity and diluting impact. Boosting intake pressure significantly increased the heat release rate. However, its impact on the normalized heat release ratio was relatively minor. The significant impact of intake pressure on heat release rate was due to the increased mass of fuel burned. The combustion process of a boosted engine can be approximated by examining the heat release rate measured under a naturally aspirated condition. This makes it convenient for researchers to numerically simulate the combustion process and the onset of knock of turbocharged SI natural gas engines under development using combustion process data measured under naturally aspirated condition as a reference.

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