Cargando…
Real Gas Model Parameters for High-Density Combustion from Chemical Kinetic Model Data
[Image: see text] Low emissions and high efficiencies can be realized in combustion systems that operate at high-pressure and low-temperature conditions (high densities). The design of such engines relies on accurate models of the physical processes involved. Under these conditions, the ideal gas mo...
Autores principales: | , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2019
|
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6649289/ https://www.ncbi.nlm.nih.gov/pubmed/31459528 http://dx.doi.org/10.1021/acsomega.8b03150 |
_version_ | 1783438013687136256 |
---|---|
author | Zheng, Chenwei Coombs, Deshawn Murray Akih-Kumgeh, Benjamin |
author_facet | Zheng, Chenwei Coombs, Deshawn Murray Akih-Kumgeh, Benjamin |
author_sort | Zheng, Chenwei |
collection | PubMed |
description | [Image: see text] Low emissions and high efficiencies can be realized in combustion systems that operate at high-pressure and low-temperature conditions (high densities). The design of such engines relies on accurate models of the physical processes involved. Under these conditions, the ideal gas model widely used in computational fluid dynamics (CFD) simulations fails to properly capture the relation among pressure, density, and temperature as well as inter-relations among other thermodynamic and transport properties. As such, discrepancies between experimental observations and CFD simulations cannot only be traced to uncertainties from experiments, turbulent, or combustion models. This paper offers a possible solution to the implementation of the real gas equation of state models in combustion simulations. The large number of species in combustion simulations requires effort to provide the relevant real gas properties. A method is suggested for incorporating these properties in simulations based on available transport and thermodynamic data of chemical kinetic models. This attempt also brings out an often-ignored problem in existing chemical kinetic models in the literature, namely, the nonsystematic assignment of transport properties for various species. To clearly demonstrate the need for real gas models in reacting flows, simulations are carried out of a high-pressure n-heptane jet into a quiescent chamber of air based on ideal gas and real gas models. The defects of the ideal gas model are revealed, and the proposed method of property estimation is justified as a convenient solution. |
format | Online Article Text |
id | pubmed-6649289 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-66492892019-08-27 Real Gas Model Parameters for High-Density Combustion from Chemical Kinetic Model Data Zheng, Chenwei Coombs, Deshawn Murray Akih-Kumgeh, Benjamin ACS Omega [Image: see text] Low emissions and high efficiencies can be realized in combustion systems that operate at high-pressure and low-temperature conditions (high densities). The design of such engines relies on accurate models of the physical processes involved. Under these conditions, the ideal gas model widely used in computational fluid dynamics (CFD) simulations fails to properly capture the relation among pressure, density, and temperature as well as inter-relations among other thermodynamic and transport properties. As such, discrepancies between experimental observations and CFD simulations cannot only be traced to uncertainties from experiments, turbulent, or combustion models. This paper offers a possible solution to the implementation of the real gas equation of state models in combustion simulations. The large number of species in combustion simulations requires effort to provide the relevant real gas properties. A method is suggested for incorporating these properties in simulations based on available transport and thermodynamic data of chemical kinetic models. This attempt also brings out an often-ignored problem in existing chemical kinetic models in the literature, namely, the nonsystematic assignment of transport properties for various species. To clearly demonstrate the need for real gas models in reacting flows, simulations are carried out of a high-pressure n-heptane jet into a quiescent chamber of air based on ideal gas and real gas models. The defects of the ideal gas model are revealed, and the proposed method of property estimation is justified as a convenient solution. American Chemical Society 2019-02-12 /pmc/articles/PMC6649289/ /pubmed/31459528 http://dx.doi.org/10.1021/acsomega.8b03150 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Zheng, Chenwei Coombs, Deshawn Murray Akih-Kumgeh, Benjamin Real Gas Model Parameters for High-Density Combustion from Chemical Kinetic Model Data |
title | Real Gas Model Parameters for High-Density Combustion
from Chemical Kinetic Model Data |
title_full | Real Gas Model Parameters for High-Density Combustion
from Chemical Kinetic Model Data |
title_fullStr | Real Gas Model Parameters for High-Density Combustion
from Chemical Kinetic Model Data |
title_full_unstemmed | Real Gas Model Parameters for High-Density Combustion
from Chemical Kinetic Model Data |
title_short | Real Gas Model Parameters for High-Density Combustion
from Chemical Kinetic Model Data |
title_sort | real gas model parameters for high-density combustion
from chemical kinetic model data |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6649289/ https://www.ncbi.nlm.nih.gov/pubmed/31459528 http://dx.doi.org/10.1021/acsomega.8b03150 |
work_keys_str_mv | AT zhengchenwei realgasmodelparametersforhighdensitycombustionfromchemicalkineticmodeldata AT coombsdeshawnmurray realgasmodelparametersforhighdensitycombustionfromchemicalkineticmodeldata AT akihkumgehbenjamin realgasmodelparametersforhighdensitycombustionfromchemicalkineticmodeldata |