An Experimental Study on the Interaction between Flow and Spark Plug Orientation on Ignition Energy and Duration for Different Electrode Designs

Paper #:
  • 2017-01-0672

Published:
  • 2017-03-28
Abstract:
The effect of flow direction towards the spark plug electrodes on ignition parameters specifically… is analyzed using an innovative spark aerodynamics fixture that enables adjustment of the spark plug gap orientation and plug axis tilt angle with respect to the incoming flow. The ignition was supplied by a long discharge high energy coil (110mJ). The flow was supplied by compressed air and the spark was discharged into the ambient flow. The secondary ignition voltage and current were measured using a high speed (10MHz) NI PXI system, and the ignition-related metrics were calculated accordingly. Five different electrode designs were tested. These designs feature different positions of the electrode gap with respect to the flow and different shapes of the ground electrodes. The resulting ignition metrics were compared with respect to the spark plug ground strap orientation and plug axis tilt angle about the flow direction, in purpose of reducing the variability in early flame kernel size that would be introduced by the incoming flow. Analysis of the experimental data indicates that the position of the ground electrode with respect to the flow is the primary factor that causes variations in ignition discharge energy and discharge duration. The discharge energy increased by 22% in average while spark plug was rotated from upstream position (ground strap shielding the flow) to crossflow position. The axis tilt angle of the spark plug impacts the results on a lesser scale, and it is dependent on the type of electrode design and the ground strap orientation.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Attention: This item is not yet published. Pre-Order to be notified, via email, when it becomes available.
Select
Price
List
Download
$22.00
Mail
$22.00
Members save up to 36% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2016-03-01
Article
2016-03-04
Training / Education
2017-04-03
Technical Paper / Journal Article
2003-10-27
Book
2005-06-17