Understanding Knock Metric for Controlled Auto-Ignition Engines

Paper #:
  • 2013-01-1658

Published:
  • 2013-04-08
Citation:
Maria, A., Cheng, W., Kar, K., and Cannella, W., "Understanding Knock Metric for Controlled Auto-Ignition Engines," SAE Int. J. Engines 6(1):533-540, 2013, https://doi.org/10.4271/2013-01-1658.
Pages:
8
Abstract:
The knock metric for controlled auto-ignition (CAI) engines is assessed by considering the physical processes that establish the pressure wave that contributes to the acoustic radiation of the engine, and by analyzing pressure data from a CAI engine. Data sets from the engine operating with port fuel injection, early direct injection and late direct injection are used to monitor the effect of mixture composition stratification. Thermodynamic analysis shows that the local pressure rise produced by heat release has to be discounted by the work spent in acoustic expansion against the ambient pressure to properly predict the pressure wave amplitude. Based on this analysis, a modified correlation between the pressure wave amplitude and the maximum pressure rise rate (MPRR) is developed by introducing an MPRR offset to account for the expansion work.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$28.00
Mail
$28.00
Members save up to 42% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
2011-04-12
Article
2017-07-26
Technical Paper / Journal Article
2011-04-12
Event
2018-04-10
Training / Education
2018-05-07
Technical Paper / Journal Article
2011-04-12
Standard
2016-05-10