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research-article

Numerical Studies of Glow Plug Shield on Natural Gas Ignition Characteristics in a CI Engine

[+] Author and Article Information
Kang Pan

Department of Mechanical & Industrial Engineering University of Toronto 5 King’s College Road, Toronto, ON, Canada, M5S 3G8
kangpan@mie.utoronto.ca

James S. Wallace

Department of Mechanical & Industrial Engineering University of Toronto5 King’s College Road, Toronto, ON, Canada, M5S 3G8
wallace@mie.utoronto.ca

1Corresponding author.

ASME doi:10.1115/1.4036293 History: Received February 14, 2017; Revised February 19, 2017

Abstract

This paper presents a numerical study on fuel injection, ignition and combustion in a direct-injection natural gas (DING) engine with ignition assisted by a shielded glow plug (GP). The shield geometry is investigated by employing different sizes of elliptical shield opening and changing the position of the shield opening. The results simulated by KIVA-3V indicated that fuel ignition and combustion is very sensitive to the relative angle between the fuel injection and the shield opening, and the use of an elliptical opening for the glow plug shield can reduce ignition delay by 0.1~0.2ms for several specific combinations of the injection angle and shield opening size, compared to a circular shield opening. In addition, the numerical results also revealed that the natural gas ignition and flame propagation will be delayed by lowering a circular shield opening from the fuel jet center plane, due to the blocking effect of the shield to the fuel mixture, and hence it will reduce the DING performance by causing a longer ignition delay.

Copyright (c) 2017 by ASME
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