Auto-ignition of toluene-doped n-heptane and iso-octane/air mixtures: High-pressure shock-tube experiments and kinetics modeling
- Institute for Combustion and Gasdynamics (IVG), University of Duisburg-Essen, Duisburg (Germany)
- Institute for Technical Thermodynamics (ITT), Karlsruhe Institute of Technology (KIT), Karlsruhe (Germany)
Toluene is often used as a fluorescent tracer for fuel concentration measurements, but without considering whether it affects the auto-ignition properties of the base fuel. We investigate the auto-ignition of pure toluene and its influence on the auto-ignition of n-heptane and iso-octane/air mixtures under engine-relevant conditions at typical tracer concentrations. Ignition delay times {tau}{sub ign} were measured behind reflected shock waves in mixtures with air at {phi}=1.0 and 0.5 at p=40 bar, over a temperature range of T=700-1200 K and compared to numerical results using two different mechanisms. Based on the models, information is derived about the relative influence of toluene on {tau}{sub ign} on the base fuels as function of temperature. For typical toluene tracer concentrations {<=}10%, the ignition delay time {tau}{sub ign} changes by less than 10% in the relevant pressure and temperature range. (author)
- OSTI ID:
- 21396169
- Journal Information:
- Combustion and Flame, Vol. 158, Issue 1; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
TOLUENE
PRESSURE RANGE MEGA PA 01-10
AIR
HEPTANE
OCTANE
MIXTURES
AUTOIGNITION
DOPED MATERIALS
SHOCK TUBES
FUELS
COMBUSTION KINETICS
SIMULATION
TEMPERATURE RANGE 0400-1000 K
SHOCK WAVES
TEMPERATURE DEPENDENCE
TIME DELAY
ENGINES
TRACE AMOUNTS
TEMPERATURE RANGE 1000-4000 K