Investigation of Kinetics of Iso-Octane Ignition Under Scramjet Conditions (Postprint)
Abstract
A single pulse reflected shock tube was used to investigate iso-octane ignition over the temperature range of 900-1400 K at a pressure of ~1 atm. To account for the anticipated long ignition delay times at the lower temperatures, long shock tube dwell times (~12 ms) at lower temperature and near atmospheric pressure were achieved by using argon-helium mix as a driver gas. Chemical thermometer experiments were conducted to remove any uncertainties in determining post-reflected shock temperatures. The ignition delay data obtained in this study are in good agreement (in the overlap region) with the iso-octane ignition data from a previous shock tube study. However, the activation energy of iso-octane ignition obtained in this study in the lower temperature region (<1300 K) is significantly smaller (~15 kcal vs. ~40 kcal) than that obtained in a previous higher temperature study. The deflagration may be responsible for lowering of activation energy under the conditions of this study. The AFRL mechanism showed a good agreement with measured ignition delays while a second mechanism (Curran et al.) showed poorer agreement.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2006
- Accession Number
- ADA464398
Entities
People
- Campbell D. Carter
- Moshan S. Kahandawala
- Shehan A. Corera
- Skip Williams
- Sukh S. Sidhu
Organizations
- University of Dayton