Effect of Elevated Piston Temperature on Combustion Chamber Deposit Growth

Paper #:
  • 940948

Published:
  • 1994-03-01
Citation:
Nakic, D., Assanis, D., and White, R., "Effect of Elevated Piston Temperature on Combustion Chamber Deposit Growth," SAE Technical Paper 940948, 1994, https://doi.org/10.4271/940948.
Pages:
15
Abstract:
An experimental study was conducted to investigate the effects of elevated piston temperature on deposit growth patterns in a spark-ignition (SI) engine. A series of thermocouple-instrumented, insulated piston designs was developed for controlling and in-situ monitoring of deposit growth on the piston surface. Upon stabilization of deposit growth, a physical and chemical analysis of deposits from different locations was conducted. It was shown that localized deposit growth correlated strongly with rates of change of temperature at the same locations. At the end of an accelerated 18-hour test schedule using a premium unleaded fuel without reformer bottoms, a 4 μm reduction in average deposit thickness was achieved by elevating the piston surface temperature from 215 °C to 264 °C. No measurable deposit growth was obtained when operating with a critical wall surface temperature of 320 °C and the base unleaded fuel. However, addition of reformer bottoms to the base unleaded fuel altered deposit properties and growth patterns. Elevating wall temperature was also shown to increase the carbon-to-hydrogen ratio in the composition of deposits.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Technical Paper / Journal Article
2010-10-25
Training / Education
2018-03-26