Internal Combustion Engines

Transient Behavior of Glow Plugs in Direct-Injection Natural Gas Engines

[+] Author and Article Information
Stewart Xu Cheng

Process Simulations Ltd., Vancouver, British Columbia, Canada

James S. Wallace

Department of Mechanical & Industrial Engineering,  University of Toronto, Toronto, Ontario, Canada

J. Eng. Gas Turbines Power 134(9), 092802 (Jul 18, 2012) (8 pages) doi:10.1115/1.4006692 History: Received October 20, 2011; Revised November 13, 2011; Published July 17, 2012; Online July 18, 2012

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 the KIVA-3V engine simulation code 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.

Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Figure 1

Structure of the sheathed type glow plug [15]

Grahic Jump Location
Figure 2

Arrangement for glow plug transient experiments

Grahic Jump Location
Figure 3

Transient response during power-up, power-off

Grahic Jump Location
Figure 4

Temperature delay from glow plug surface to core

Grahic Jump Location
Figure 5

Glow plug transient response to finite duration cooling

Grahic Jump Location
Figure 6

Glow plug heater tube cross-section for lumped capacitance model

Grahic Jump Location
Figure 7

Heater tube wall section heat transfers

Grahic Jump Location
Figure 8

Calculated response of lumped capacitance glow plug model to power-on, power-off

Grahic Jump Location
Figure 9

Illustration of transient temperature penetration

Grahic Jump Location
Figure 10

Penetration thickness δ versus time

Grahic Jump Location
Figure 11

KIVA-3V grid structure around glow plug

Grahic Jump Location
Figure 12

Illustration of the glow plug discretization model

Grahic Jump Location
Figure 13

Illustration of one heat transfer channel and its initial internal temperature profile




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In