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Chemical Kinetic Modeling of Formation of Products of Incomplete Combustion from Spark-ignition Engines
EPA Grant Number: R824970C001Subproject: this is subproject number 001 , established and managed by the Center Director under grant R824970
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
Center: EERC - Center for Airborne Organics (MIT)
Center Director: Seinfeld, John
Title: Chemical Kinetic Modeling of Formation of Products of Incomplete Combustion from Spark-ignition Engines
Investigators: Hochgreb, Simone
Institution: Massachusetts Institute of Technology
EPA Project Officer: Shapiro, Paul
Project Period:
Project Amount: Refer to main center abstract for funding details.
RFA: Center on Airborne Organics (1993)
Research Category: Targeted Research
Description:
Objective:During the first three months of the investigation, a one-dimensional code has been used to investigate the chemistry of oxidation of propane from unburned hydrocarbon layers near cold walls during the post flame expansion. The results show that the core gas temperature has the biggest impact on the oxidation level of unburned hydrocarbons and on the production of incomplete combustion products. Accordingly, at early stages of the expansion process (with core temperatures above 1800 K), oxidation is fast and complete. At later stages, when core temperatures drop below 1600 K, the oxidation rate decreases and the ratio of non-fuel intermediates to the original fuel increases. Finally at the end of expansion, the oxidation rate becomes very slow and a high portion of fuel survives oxidation with smaller production of intermediate hydrocarbons. Simulations show that transport rates and the assumed thickness of the initial thermal boundary layer near the wall have only moderate impact on the oxidation level and fuel/nonfuel ratio. Supplemental Keywords:
modeling, combustion, hydrocarbons. , Air, Scientific Discipline, Waste, RFA, Incineration/Combustion, Atmospheric Sciences, particulate matter, Environmental Chemistry, combustion contaminants, incineration, ambient air quality, hydrocarbons, combustion byproducts, spark ignition engine, spark ignition engines, hydrocarbon, combustion, emissions, oxidation, chemical kinetics, kinetc models, engine deposits, particulates, products of incomplete combustion (PIC), atmospheric chemistry, modeling studies, modeling, ambient aerosol
Progress and Final Reports:
1997 Progress Report
Main Center Abstract and Reports:
R824970 EERC - Center for Airborne Organics (MIT)
Subprojects under this Center:
(EPA does not fund or establish subprojects; EPA awards and manages the overall grant for this center).
R824970C001 Chemical Kinetic Modeling of Formation of Products of Incomplete Combustion
from Spark-ignition Engines
R824970C002 Combustion Chamber Deposit Effects on Engine Hydrocarbon Emissions
R824970C003 Atmospheric Transformation of Volatile Organic Compounds: Gas-Phase
Photooxidation and Gas-to-Particle Conversion
R824970C004 Mathematical Models of the Transport and Fate of Airborne Organics
R824970C005 Elementary Reaction Mechanism and Pathways for Atmospheric Reactions
of Aromatics - Benzene and Toluene
R824970C006 Simultaneous Removal of Soot and NOx from the Exhaust of Diesel Powered
Vehicles
R824970C007 Modeling Gas-Phase Chemistry and Heterogeneous Reaction of Polycyclic
Aromatic Compounds
R824970C008 Fundamental Study on High Temperature Chemistry of Oxygenated Hydrocarbons
as Alternate Motor Fuels and Additives
R824970C009 Markers for Emissions from Combustion Sources
R824970C010 Experimental Investigation of the Evolution of the Size and Composition Distribution of Atmospheric Organic Aerosols
R824970C011 Microengineered Mass Spectrometer for in-situ Measurement of Airborne
Contaminants