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Locally variable turbulent Prandtl number considerations on the modeling of Liquid Rocket Engines operating above the critical point

2019-09-02Conference object Open access
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dc.contributor.authorMagalhães, Leandro
dc.contributor.authorSilva, A. R. R.
dc.contributor.authorBarata, Jorge M M
dc.date.accessioned2020-01-10T14:38:21Z
dc.date.available2020-01-10T14:38:21Z
dc.date.issued2019-09-02
dc.description.abstractThe general idea behind the present work is to study the injection of a cryogenic liquid numerically into rocket engines, where propellant conditions are above the thermodynamic critical point, for a non-reactive case. The singular behavior of thermodynamic and transport properties at and around the critical point makes this a most challenging task. While mass diffusivity, surface tension, and latent heat are zero at the critical point, isentropic compressibility, specific heat, and thermal conductivity tend to infinity. As a result, the distinction between liquid and solid phases disappears. Ultimately, the fluid has liquid-like density and gas-like properties, mass diffusion replaces vaporization as a governing parameter, and it dominates over jet atomization. Henceforth, any model used incorporates as close as possible to reality, the variation of thermodynamic and transport properties. An incompressible variable-density flow is simulated using Favre averages (FANS) with a locally variable turbulent Prandtl number, taking into account the potential core, transition, and the self-similar region of the jet. The use of a turbulence model with a variable turbulent Prandtl number arises from the ineffectiveness in predicting observed anisotropies in the thermal eddy diffusivity fields when this value is taken as a constant. Favre averaged conservation equations for mass, momentum, and energy are coupled with the k- two-equation turbulence model and discretized following the third order upwind QUICK scheme. Stability and accuracy of the results are maintained through a careful selection of the parameters involved in the models. The use of the conservation equation for energy is justified as an indirect means to evaluate the thermal field. Results are compared with experimental cases for validation purposes as well as LES computations for performance comparison and evaluation of the degree of model complexity needed to achieve satisfactory results.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationLeandro Magalhães, Jorge Barata, André Silva, “Locally variable turbulent Prandtl number considerations on the modeling of Liquid Rocket Engines operating above the critical point”, ILASS 2019 - 29th European Conference on Liquid Atomization and Spray Systems, Paris, France, 2-4 Sep, 2019pt_PT
dc.identifier.othersciencesconf.org:ilass19:245086
dc.identifier.urihttp://hdl.handle.net/10400.6/8207
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationAssociate Laboratory of Energy, Transports and Aeronautics
dc.relation.publisherversionhttps://ilass19.sciencesconf.org/245086/documentpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectSupercritical fluidspt_PT
dc.subjectVariable turbulent Prandtl numberpt_PT
dc.subjectCryogenicspt_PT
dc.subjectRocket enginespt_PT
dc.titleLocally variable turbulent Prandtl number considerations on the modeling of Liquid Rocket Engines operating above the critical pointpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleAssociate Laboratory of Energy, Transports and Aeronautics
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FEMS%2F50022%2F2019/PT
oaire.citation.conferencePlaceParis, Françapt_PT
oaire.citation.titleILASS 2019 - 29th European Conference on Liquid Atomization and Spray Systemspt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameMagalhães
person.familyNameResende Rodrigues da Silva
person.familyNameMartins Barata
person.givenNameLeandro
person.givenNameAndré
person.givenNameJorge Manuel
person.identifier2611303
person.identifierJ-4185-2012
person.identifierhFY_5JYAAAAJ&hl
person.identifier.ciencia-id571C-5641-9D78
person.identifier.ciencia-id8219-4B2B-E1C7
person.identifier.ciencia-idF611-BBCC-DAA8
person.identifier.orcid0000-0002-1256-9689
person.identifier.orcid0000-0002-4901-7140
person.identifier.orcid0000-0001-9014-5008
person.identifier.scopus-author-id11440407500
person.identifier.scopus-author-id11439470600
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublication908e150d-3890-457c-b5da-09c84671cb93
relation.isAuthorOfPublicationc4346556-933d-4f70-9b6d-8e1670d57be6
relation.isAuthorOfPublication.latestForDiscoveryc4346556-933d-4f70-9b6d-8e1670d57be6
relation.isProjectOfPublication64099087-6b75-4ef4-81c8-aa96db4b7829
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