Abstract/Details

Development of Detailed, Reduced and Skeletal Kinetic Mechanisms for Hydrocarbon Oxidation at Low and Intermediate Temperatures


2011 2011

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Abstract (summary)

In the absence of scalable alternative energy sources that are greenhouse gas (GHG) neutral, hydrocarbon fuels are expected to continue to be a large part of the energy mix for the foreseeable future. Nevertheless, combustion technologies and fuels will have to be improved and refined to reduce hazardous and GHG emissions and improve efficiency. Computer simulations using accurate chemical kinetic models are increasingly being used to aid the development of these technologies. This study presents approaches that can help improve kinetic models for combustion and aid the development of new engine technologies that are fuel efficient and produce lower GHG emissions.

A reduced kinetic mechanism that can predict cool flames for propane-air mixtures was developed. The mechanism is able to predict multiple cool flames, global variables and species concentrations within defined accuracy limits, and reduces computation time by a factor of three and computer memory for the computation by an order of magnitude.

This study also developed algorithms for the development of extended detailed kinetic mechanisms as well as skeletal models for primary fuels and fuel additives. This algorithm was used to develop a detailed mechanism for the combustion of Primary Reference Fuels (PRFs) and Di-Tertiary Butyl Peroxide (DTBP), a fuel additive. The detailed kinetic mechanism was able to help explain the impact of DTBP on PRF combustion in a PCI engine and identify the primary mode of action of DTBP depending on the PRF octane number. The skeletal model reduces the computation time by 99.6%, and requires approximately 0.1% computer memory compared to the detailed mechanism.

As a final objective, the first detailed kinetic mechanism accounting for the formation of lactones during low temperature combustion of hydrocarbons was developed. Lactones are cyclic ethers with a carbonyl function that have been observed experimentally by several research groups including the combustion chemistry group at Drexel University, but not predicted, by kinetic mechanisms available today. The proposed detailed kinetic mechanism, containing 206 new reactions and 35 new species, was able to achieve good agreement with published experimental data for the non-alkylated lactones produced during the oxidation of n-dodecane in a Pressurized Flow Reactor.

Indexing (details)


Subject
Organic chemistry;
Chemical engineering;
Mechanical engineering
Classification
0490: Organic chemistry
0542: Chemical engineering
0548: Mechanical engineering
Identifier / keyword
Applied sciences; Pure sciences; Combustion; Cool flames; Fuel additives; Hydrocarbon; Oxidation
Title
Development of Detailed, Reduced and Skeletal Kinetic Mechanisms for Hydrocarbon Oxidation at Low and Intermediate Temperatures
Author
Gupta, Ashutosh
Number of pages
277
Publication year
2011
Degree date
2011
School code
0065
Source
DAI-B 72/10, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9781124765730
Advisor
Miller, David L.; Cernansky, Nicholas P.
University/institution
Drexel University
University location
United States -- Pennsylvania
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3463864
ProQuest document ID
881645615
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/881645615
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