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Title: Ignition Delay in Low Temperature Combustion

Abstract

Low temperature combustion (LTC) strategies present a means of reducing soot and oxides of nitrogen (NOx) emissions while simultaneously increasing efficiency relative to conventional combustion modes. By sufficiently premixing fuel and air before combustion, LTC strategies avoid high fuel-to-air equivalence ratios that lead to soot production. Dilution of the mixture lowers the combustion temperatures to reduce NOx production and offers thermodynamic advantages for improved efficiency. However, issues such as high heat release rates (HRRs), incomplete combustion, and difficulty in controlling the timing of combustion arise with low equivalence ratios and combustion temperatures. Ignition delay (the time until the start of combustion) is a way to quantify the time available for fuel and air to mix inside the cylinder before combustion. Previous studies have used ignition delay to explain trends seen in LTC such as combustion stability and HRRs. This study provides a novel method of integrating ignition delay into the investigation of LTC to determine what insights ignition delay calculations can provide for the different challenges associated with LTC strategies. To eliminate the need for large chemical kinetic models and interpolation to predict ignition delay, an ignition delay correlation is used. The flexibility gained using the correlation allows this methodmore » to be quickly adapted to target different LTC strategies and challenges. In this work, three cases of low temperature gasoline combustion (LTGC) with varying stratification levels were evaluated with an emphasis on the non-monotonic trend of the HRRs. The described method for ignition delay calculation is used to detail the stratification and ignition delay distributions for each case and provide insight into the observed trends.« less

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
1462880
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Journal Volume: 1; Conference: SAE WCX - Detroit, Michigan, United States of America - 4/10/2018 8:00:00 AM-4/12/2018 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Drallmeier, Joseph A., Wissink, Martin L., Curran, Scott, and Wagner, Robert M. Ignition Delay in Low Temperature Combustion. United States: N. p., 2018. Web. doi:10.4271/2018-01-1125.
Drallmeier, Joseph A., Wissink, Martin L., Curran, Scott, & Wagner, Robert M. Ignition Delay in Low Temperature Combustion. United States. doi:10.4271/2018-01-1125.
Drallmeier, Joseph A., Wissink, Martin L., Curran, Scott, and Wagner, Robert M. Sun . "Ignition Delay in Low Temperature Combustion". United States. doi:10.4271/2018-01-1125. https://www.osti.gov/servlets/purl/1462880.
@article{osti_1462880,
title = {Ignition Delay in Low Temperature Combustion},
author = {Drallmeier, Joseph A. and Wissink, Martin L. and Curran, Scott and Wagner, Robert M.},
abstractNote = {Low temperature combustion (LTC) strategies present a means of reducing soot and oxides of nitrogen (NOx) emissions while simultaneously increasing efficiency relative to conventional combustion modes. By sufficiently premixing fuel and air before combustion, LTC strategies avoid high fuel-to-air equivalence ratios that lead to soot production. Dilution of the mixture lowers the combustion temperatures to reduce NOx production and offers thermodynamic advantages for improved efficiency. However, issues such as high heat release rates (HRRs), incomplete combustion, and difficulty in controlling the timing of combustion arise with low equivalence ratios and combustion temperatures. Ignition delay (the time until the start of combustion) is a way to quantify the time available for fuel and air to mix inside the cylinder before combustion. Previous studies have used ignition delay to explain trends seen in LTC such as combustion stability and HRRs. This study provides a novel method of integrating ignition delay into the investigation of LTC to determine what insights ignition delay calculations can provide for the different challenges associated with LTC strategies. To eliminate the need for large chemical kinetic models and interpolation to predict ignition delay, an ignition delay correlation is used. The flexibility gained using the correlation allows this method to be quickly adapted to target different LTC strategies and challenges. In this work, three cases of low temperature gasoline combustion (LTGC) with varying stratification levels were evaluated with an emphasis on the non-monotonic trend of the HRRs. The described method for ignition delay calculation is used to detail the stratification and ignition delay distributions for each case and provide insight into the observed trends.},
doi = {10.4271/2018-01-1125},
journal = {},
issn = {0148--7191},
number = ,
volume = 1,
place = {United States},
year = {2018},
month = {4}
}

Conference:
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