Exergy Analysis in Hydrogen-Air Detonation
The main goal of this paper is to analyze the exergy losses during the shock and rarefaction wave of hydrogen-air mixture. First, detonation parameters (pressure, temperature, density, and species mass fraction) are calculated for three cases where the hydrogen mass fraction in air is 1.5%, 2.5%, an...
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Wiley
2012-01-01
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| Series: | Journal of Applied Mathematics |
| Online Access: | http://dx.doi.org/10.1155/2012/502979 |
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| author | Abel Rouboa Valter Silva Nuno Couto |
| author_facet | Abel Rouboa Valter Silva Nuno Couto |
| author_sort | Abel Rouboa |
| collection | DOAJ |
| description | The main goal of this paper is to analyze the exergy losses during the shock and rarefaction wave of hydrogen-air mixture. First, detonation parameters (pressure, temperature, density, and species mass fraction) are calculated for three cases where the hydrogen mass fraction in air is 1.5%, 2.5%, and 5%. Then, exergy efficiency is used as objective criteria of performance evaluation. A two-dimensional computational fluid dynamic code is developed using Finite volume discretization method coupled with implicit scheme for the time discretization (Euler system equations). A seven-species and five-step global reactions mechanism is used. Implicit total variation diminishing (TVD) algorithm, based on Riemann solver, is solved. The typical diagrams of exergy balances of hydrogen detonation in air are calculated for each case. The energy balance shows a successive conversion of kinetic energy, and total enthalpy, however, does not indicate consequent losses. On the other hand, exergy losses increase with the augment of hydrogen concentration in air. It obtained an exergetic efficiency of 77.2%, 73.4% and 69.7% for the hydrogen concentrations of 1.5%, 2.5%, and 5%, respectively. |
| format | Article |
| id | doaj-art-be27d3967174483f83b95cf4952ee6d9 |
| institution | Kabale University |
| issn | 1110-757X 1687-0042 |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Applied Mathematics |
| spelling | doaj-art-be27d3967174483f83b95cf4952ee6d92025-02-03T06:11:25ZengWileyJournal of Applied Mathematics1110-757X1687-00422012-01-01201210.1155/2012/502979502979Exergy Analysis in Hydrogen-Air DetonationAbel Rouboa0Valter Silva1Nuno Couto2CITAB/Engineering Department, School of Science and Technology of University of UTAD, Vila Real 5001-801, PortugalCITAB/Engineering Department, School of Science and Technology of University of UTAD, Vila Real 5001-801, PortugalCITAB/Engineering Department, School of Science and Technology of University of UTAD, Vila Real 5001-801, PortugalThe main goal of this paper is to analyze the exergy losses during the shock and rarefaction wave of hydrogen-air mixture. First, detonation parameters (pressure, temperature, density, and species mass fraction) are calculated for three cases where the hydrogen mass fraction in air is 1.5%, 2.5%, and 5%. Then, exergy efficiency is used as objective criteria of performance evaluation. A two-dimensional computational fluid dynamic code is developed using Finite volume discretization method coupled with implicit scheme for the time discretization (Euler system equations). A seven-species and five-step global reactions mechanism is used. Implicit total variation diminishing (TVD) algorithm, based on Riemann solver, is solved. The typical diagrams of exergy balances of hydrogen detonation in air are calculated for each case. The energy balance shows a successive conversion of kinetic energy, and total enthalpy, however, does not indicate consequent losses. On the other hand, exergy losses increase with the augment of hydrogen concentration in air. It obtained an exergetic efficiency of 77.2%, 73.4% and 69.7% for the hydrogen concentrations of 1.5%, 2.5%, and 5%, respectively.http://dx.doi.org/10.1155/2012/502979 |
| spellingShingle | Abel Rouboa Valter Silva Nuno Couto Exergy Analysis in Hydrogen-Air Detonation Journal of Applied Mathematics |
| title | Exergy Analysis in Hydrogen-Air Detonation |
| title_full | Exergy Analysis in Hydrogen-Air Detonation |
| title_fullStr | Exergy Analysis in Hydrogen-Air Detonation |
| title_full_unstemmed | Exergy Analysis in Hydrogen-Air Detonation |
| title_short | Exergy Analysis in Hydrogen-Air Detonation |
| title_sort | exergy analysis in hydrogen air detonation |
| url | http://dx.doi.org/10.1155/2012/502979 |
| work_keys_str_mv | AT abelrouboa exergyanalysisinhydrogenairdetonation AT valtersilva exergyanalysisinhydrogenairdetonation AT nunocouto exergyanalysisinhydrogenairdetonation |