NDLI: Transient Behaviour of Glow Plugs in Direct Injection Natural Gas Engines

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cheng, Stewart Xu James, S. Wallace
Copyright Year	2011
Abstract	Glow plugs are a possible ignition source for direct injected natural gas engines. This ignition assistance application is much different than the cold start assist function for which most glow plugs have been designed. In the cold start application, the glow plug is simply heating the air in the cylinder. In the cycle-by-cycle ignition assist application, the glow plug needs to achieve high surface temperatures at specific times in the engine cycle to provide a localized source of ignition. Whereas a simple lumped heat capacitance model is a satisfactory representation of the glow plug for the air heating situation, a much more complex situation exists for hot surface ignition. Simple measurements and theoretical analysis show that the thickness of the heat penetration layer is small within the time scale of the ignition preparation period (1–2 ms). The experiments and analysis were used to develop a discretized representation of the glow plug domain. A simplified heat transfer model, incorporating both convection and radiation losses, was developed for the discretized representation to compute heat transfer to and from the surrounding gas. A scheme for coupling the glow plug model to the surrounding gas computational domain in KIVA-3V was also developed. The glow plug model successfully simulates the natural gas ignition process for a direct injection natural gas engine. As well, it can provide detailed information on the local glow plug surface temperature distribution, which can aid in the design of more reliable glow plugs.
Sponsorship	Internal Combustion Engine Division
Starting Page	47
Ending Page	56
Page Count	10
File Format	PDF
ISBN	9780791844427
DOI	10.1115/ICEF2011-60131
Conference Proceedings	ASME 2011 Internal Combustion Engine Division Fall Technical Conference
Language	English
Publisher Date	2011-10-02
Publisher Place	Morgantown, West Virginia, USA
Access Restriction	Subscribed
Subject Keyword	Cycles Temperature distribution Temperature Gas engines Luminescence Ignition Theoretical analysis Convection Engines Transients (dynamics) Design Heat Radiation (physics) Heating Capacitance Heat transfer Natural gas Cylinders
Content Type	Text
Resource Type	Article

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