Fundamental studies of fuel chemistry as related to internal combustion engine phenomena. Final technical report, October 1987--December 1989

Technical Report · Sat Sep 01 00:00:00 EDT 1990

DOI:https://doi.org/10.2172/10189573· OSTI ID:10189573

Dryer, F L; Brezinsky, K

Intent of this research effort was to provide insight (through homogeneous gas phase kinetic studies at different constant pressures) to the fuel chemistry issues important to autoignition in engines. Conditions of the proposed experiments were chosen to be similar to engine parameters under knocking conditions: 700--1100 K temperatures, 1--20 atm pressures, and stoichiometries around 1. A variable pressure flow reactor was designed in which a range of reaction pressures and lower reaction temperatures could be accessed. Crossed beam optical access, continuous on-line gas sampling (nondispersive infrared, oxygen paramagnetic, H thermo-conductive, Fourier transform infrared, off-line GC, GC/mass spectrometric, wet chemical), and temperature measurements at the sampling location are available; reacting systems with reaction times ranging from 50--100 ms to 15--20 s can be studied. Testing has begun. Experiments on isobutene/oxygen mixtures have been conducted in the old atmospheric pressure flow reactor at 1150 K and in an equivalence ratio range of pyrolysis with 100 ppM oxygen background to 0.42. The kinetic model indicates that the inhibitory effect of isobutene at high temps is due to depletion of the active radical pool and formation of unreactive stable species and methyl radicals; isobutene oxidation/pyrolysis is heavily influenced by the chemistry of methyl radicals. The reaction of hydroperoxy radical (HO{sub 2}) with methyl radical and its effect on isobutene oxidation will be studied in the new reactor.

• Research Organization: Princeton Univ., NJ (United States). Dept. of Mechanical and Aerospace Engineering
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG04-87AL43771
• OSTI ID: 10189573
• Report Number(s): DOE/AL/43771-T3; ON: DE95001552; BR: 35EG00000/EG0500000
• Resource Relation: Other Information: PBD: Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
INTERNAL COMBUSTION ENGINES
COMBUSTION KINETICS
2-METHYLPROPENE
OXIDATION
PYROLYSIS
PROGRESS REPORT
KNOCK CONTROL
CHEMICAL REACTION KINETICS
RADICALS
METHYL RADICALS
CHEMICAL REACTORS
330100
400800
COMBUSTION, PYROLYSIS, AND HIGH-TEMPERATURE CHEMISTRY