Publication
Unfocused laser ignition of high-pressure He–H2-O2 combustible mixtures
| dc.contributor.author | Grosso Ferreira, R. | |
| dc.contributor.author | Carvalho, B. | |
| dc.contributor.author | Rodrigues, José-António | |
| dc.contributor.author | Rodrigues, R. | |
| dc.contributor.author | Smith, A. | |
| dc.contributor.author | Marraffa, L. | |
| dc.contributor.author | Lino da Silva, M. | |
| dc.date.accessioned | 2024-03-21T13:08:16Z | |
| dc.date.available | 2024-03-21T13:08:16Z | |
| dc.date.issued | 2024 | |
| dc.description.abstract | We report consistent ignition of high-pressure (p(fill)>20-30 bar) hydrogen-oxygen mixtures diluted with helium in two different combustion vessels, using an unfocused Nd:YAG laser. This corresponds to laser irradiances several orders of magnitude below the minimum ignition energies reported in the literature. This unusual phenomena has led us to try to measure the amount of laser radiation absorbed by the gas medium. By placing a mirror inside a cylindrical vessel and filling it up to 100 bar with He-H-2 or He-O-2 non-combustible mixtures, we obtain the pressure-dependent absorptivity of the combustible He-H-2-O-2 mixture. We find no measurable absorption of the laser signal by the medium, for the overall pressure range, to the experimental apparatus sensitivity (about 1% of the laser irradiance). The exact mechanism for ignition remains henceforth unknown. One possibility could the creation of seed electrons created by autofocusing ionization of dust/impurities in the gas, but this has yet to be experimentally confirmed. | pt_PT |
| dc.description.sponsorship | European Space Agency, France (contract nos. 4200023086, 4000111557 and 4000118059) | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.doi | 10.1016/j.ijhydene.2024.01.271 | pt_PT |
| dc.identifier.issn | 0360-3199 | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/20531 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.publisher | Elsevier | pt_PT |
| dc.relation | Institute for Plasmas and Nuclear Fusion | |
| dc.relation | APPlAuSE - Advanced Program in Plasma Science and Engineering - High-Temperature Non-Equilibrium CO2 Kinetic and Radiation Processes | |
| dc.relation | Institute for Plasmas and Nuclear Fusion | |
| dc.relation | Institute for Plasmas and Nuclear Fusion | |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | pt_PT |
| dc.subject | High-pressure | pt_PT |
| dc.subject | Laser | pt_PT |
| dc.subject | Ignition | pt_PT |
| dc.subject | Combustion | pt_PT |
| dc.subject | Spark-ignition | pt_PT |
| dc.title | Unfocused laser ignition of high-pressure He–H2-O2 combustible mixtures | pt_PT |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardTitle | Institute for Plasmas and Nuclear Fusion | |
| oaire.awardTitle | APPlAuSE - Advanced Program in Plasma Science and Engineering - High-Temperature Non-Equilibrium CO2 Kinetic and Radiation Processes | |
| oaire.awardTitle | Institute for Plasmas and Nuclear Fusion | |
| oaire.awardTitle | Institute for Plasmas and Nuclear Fusion | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F50010%2F2020/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT//PD%2FBD%2F114325%2F2016/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F50010%2F2020/PT | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0061%2F2020/PT | |
| oaire.citation.endPage | 953 | pt_PT |
| oaire.citation.startPage | 948 | pt_PT |
| oaire.citation.title | International Journal of Hydrogen Energy | pt_PT |
| oaire.citation.volume | 58 | pt_PT |
| oaire.fundingStream | 6817 - DCRRNI ID | |
| oaire.fundingStream | 6817 - DCRRNI ID | |
| oaire.fundingStream | 6817 - DCRRNI ID | |
| person.familyName | Rodrigues | |
| person.givenName | José-António | |
| person.identifier.ciencia-id | 2A1C-168D-848E | |
| person.identifier.orcid | 0000-0003-2187-9408 | |
| person.identifier.rid | D-4587-2013 | |
| person.identifier.scopus-author-id | 7202707531 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | article | pt_PT |
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