Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels

A comprehensive second law analysis of combustion for a range of conditions and fuels was completed. Constant pressure, constant volume and constant temperature combustion processes were examined. The parameters studied were reactant temperature, reactant pressure, equivalence ratio and the fuels th...

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Main Author: Chavannavar, Praveen Shivshankar
Other Authors: Caton, Jerald A.
Format: Others
Language:en_US
Published: Texas A&M University 2005
Subjects:
Online Access:http://hdl.handle.net/1969.1/2675
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spelling ndltd-tamu.edu-oai-repository.tamu.edu-1969.1-26752013-01-08T10:37:57ZParametric examination of the destruction of availability due to combustion for a range of conditions and fuelsChavannavar, Praveen ShivshankarCombustionAvailability analysisA comprehensive second law analysis of combustion for a range of conditions and fuels was completed. Constant pressure, constant volume and constant temperature combustion processes were examined. The parameters studied were reactant temperature, reactant pressure, equivalence ratio and the fuels themselves. In addition, the contribution and relative significance of the various components (thermo-mechanical, reactive and diffusion) to the mixture availability was examined. Also, the effect of reactant mixture dissociation was incorporated into the combustion analysis. It was found that for similar initial conditions, constant pressure combustion and constant volume combustion exhibited similar trends. For constant temperature combustion, the trend is significantly different from the constant pressure and constant volume combustion, with almost the entire reactant availability being destroyed due to combustion at lower temperatures. Amongst the parameters examined, reactant mixture temperature had the most significant effect on the fraction of availability destroyed during combustion. The percentage availability destroyed reduced from 25 to 30% at 300 K to about 5% at 6000 K for constant pressure and constant volume combustion processes. The effect of the reactant mixture pressure on the fraction of availability destroyed was more modest. The values for the percentage availability destroyed for pressures ranging from 50 kPa to 5000 kPa were found to lie within a range of 5%. The effect of equivalence ratio on the fraction of reactant mixture availability destroyed was also documented. In general, it was found that the destruction of availability decreased with increasing equivalence ratios. This value, however, accounts for the availability due to fuel like species in the product mixture. Therefore, for practical applications, combustion of the stoichiometric mixture would be preferred over the rich equivalence ratios. It was found that the fraction of reactant availability destroyed increased with increasing complexity of the fuel??s molecular structure. In addition, it was shown that the diffusion availability terms is small and may be neglected, while the reactive availability and thermo-mechanical availability are more significant.Texas A&M UniversityCaton, Jerald A.2005-11-01T15:49:06Z2005-11-01T15:49:06Z2005-082005-11-01T15:49:06ZBookThesisElectronic Thesistext1054636 byteselectronicapplication/pdfborn digitalhttp://hdl.handle.net/1969.1/2675en_US
collection NDLTD
language en_US
format Others
sources NDLTD
topic Combustion
Availability analysis
spellingShingle Combustion
Availability analysis
Chavannavar, Praveen Shivshankar
Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
description A comprehensive second law analysis of combustion for a range of conditions and fuels was completed. Constant pressure, constant volume and constant temperature combustion processes were examined. The parameters studied were reactant temperature, reactant pressure, equivalence ratio and the fuels themselves. In addition, the contribution and relative significance of the various components (thermo-mechanical, reactive and diffusion) to the mixture availability was examined. Also, the effect of reactant mixture dissociation was incorporated into the combustion analysis. It was found that for similar initial conditions, constant pressure combustion and constant volume combustion exhibited similar trends. For constant temperature combustion, the trend is significantly different from the constant pressure and constant volume combustion, with almost the entire reactant availability being destroyed due to combustion at lower temperatures. Amongst the parameters examined, reactant mixture temperature had the most significant effect on the fraction of availability destroyed during combustion. The percentage availability destroyed reduced from 25 to 30% at 300 K to about 5% at 6000 K for constant pressure and constant volume combustion processes. The effect of the reactant mixture pressure on the fraction of availability destroyed was more modest. The values for the percentage availability destroyed for pressures ranging from 50 kPa to 5000 kPa were found to lie within a range of 5%. The effect of equivalence ratio on the fraction of reactant mixture availability destroyed was also documented. In general, it was found that the destruction of availability decreased with increasing equivalence ratios. This value, however, accounts for the availability due to fuel like species in the product mixture. Therefore, for practical applications, combustion of the stoichiometric mixture would be preferred over the rich equivalence ratios. It was found that the fraction of reactant availability destroyed increased with increasing complexity of the fuel??s molecular structure. In addition, it was shown that the diffusion availability terms is small and may be neglected, while the reactive availability and thermo-mechanical availability are more significant.
author2 Caton, Jerald A.
author_facet Caton, Jerald A.
Chavannavar, Praveen Shivshankar
author Chavannavar, Praveen Shivshankar
author_sort Chavannavar, Praveen Shivshankar
title Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
title_short Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
title_full Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
title_fullStr Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
title_full_unstemmed Parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
title_sort parametric examination of the destruction of availability due to combustion for a range of conditions and fuels
publisher Texas A&M University
publishDate 2005
url http://hdl.handle.net/1969.1/2675
work_keys_str_mv AT chavannavarpraveenshivshankar parametricexaminationofthedestructionofavailabilityduetocombustionforarangeofconditionsandfuels
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