Advancing overpressure quantification methodology for hydrogen venting
A major safety problem at present is the lack of an agreed methodology to estimate blast loads from hydrogen (H2) vents. Of particular interest is the delayed ignition of the flammable clouds that form upon a controlled or uncontrolled release. This study aims to test and improve an existing methodo...
| Autor: | |
|---|---|
| Tipo de recurso: | tesis de maestría |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:dnet:upcommonspor::f1c8592f9813e50faf6f83badbac8d2a |
| Acceso en línea: | https://hdl.handle.net/2117/460999 |
| Access Level: | acceso abierto |
| Palabra clave: | Hydrogen -- Safety measures Hydrogen Hydrogen venting Deflagration Detonation Unconfined and uncongested release Hydrogen explosion Overpressure Hidrogen -- Mesures de seguretat Hidrogen -- Inflamabilitat Àrees temàtiques de la UPC::Enginyeria química |
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España |
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| dc.title.none.fl_str_mv |
Advancing overpressure quantification methodology for hydrogen venting |
| title |
Advancing overpressure quantification methodology for hydrogen venting |
| spellingShingle |
Advancing overpressure quantification methodology for hydrogen venting Jarubenjaluk, Adisa Hydrogen -- Safety measures Hydrogen Hydrogen venting Deflagration Detonation Unconfined and uncongested release Hydrogen explosion Overpressure Hidrogen -- Mesures de seguretat Hidrogen -- Inflamabilitat Àrees temàtiques de la UPC::Enginyeria química |
| title_short |
Advancing overpressure quantification methodology for hydrogen venting |
| title_full |
Advancing overpressure quantification methodology for hydrogen venting |
| title_fullStr |
Advancing overpressure quantification methodology for hydrogen venting |
| title_full_unstemmed |
Advancing overpressure quantification methodology for hydrogen venting |
| title_sort |
Advancing overpressure quantification methodology for hydrogen venting |
| dc.creator.none.fl_str_mv |
Jarubenjaluk, Adisa |
| author |
Jarubenjaluk, Adisa |
| author_facet |
Jarubenjaluk, Adisa |
| author_role |
author |
| dc.contributor.none.fl_str_mv |
Vacca, Pascale |
| dc.subject.none.fl_str_mv |
Hydrogen -- Safety measures Hydrogen Hydrogen venting Deflagration Detonation Unconfined and uncongested release Hydrogen explosion Overpressure Hidrogen -- Mesures de seguretat Hidrogen -- Inflamabilitat Àrees temàtiques de la UPC::Enginyeria química |
| topic |
Hydrogen -- Safety measures Hydrogen Hydrogen venting Deflagration Detonation Unconfined and uncongested release Hydrogen explosion Overpressure Hidrogen -- Mesures de seguretat Hidrogen -- Inflamabilitat Àrees temàtiques de la UPC::Enginyeria química |
| description |
A major safety problem at present is the lack of an agreed methodology to estimate blast loads from hydrogen (H2) vents. Of particular interest is the delayed ignition of the flammable clouds that form upon a controlled or uncontrolled release. This study aims to test and improve an existing methodology to enable more accurate prediction of overpressure in hydrogen venting scenarios. Present deflagration model underestimates overpressures by an order of magnitude, whereas the detonation model results in overly conservative estimates albeit useful to retain as an upper limit. While in safety assessments, a certain degree of conservatism is preferred due to the non-negligible potential consequences, estimates should be realistic and in line with the physics that expected to play a role emphasising the need to improve deflagration modelling. Visible flame speed is identified as the most influential parameter in the deflagration model. Modelled estimates based on cloud radius tends to yield slower flame speeds. An alternative approach using the Reynolds number—reflecting the turbulence induced by pressurised gas release—was proposed. The refined methodology was tested against vertical hydrogen release experiments, demonstrating improved overpressure predictions, with 73% of the predictions falling within a factor of four overestimation. |
| publishDate |
2025 |
| dc.date.none.fl_str_mv |
2025 2025-07-03 2026 2026-04-27 |
| dc.type.none.fl_str_mv |
master thesis http://purl.org/coar/resource_type/c_bdcc NA http://purl.org/coar/version/c_be7fb7dd8ff6fe43 |
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info:eu-repo/semantics/masterThesis |
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masterThesis |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/2117/460999 |
| url |
https://hdl.handle.net/2117/460999 |
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Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
Universitat Politècnica de Catalunya |
| publisher.none.fl_str_mv |
Universitat Politècnica de Catalunya |
| dc.source.none.fl_str_mv |
reponame:UPCommons. Portal del coneixement obert de la UPC instname:Universitat Politècnica de Catalunya (UPC) |
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Universitat Politècnica de Catalunya (UPC) |
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UPCommons. Portal del coneixement obert de la UPC |
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UPCommons. Portal del coneixement obert de la UPC |
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|
| repository.mail.fl_str_mv |
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| _version_ |
1869405708405964800 |
| spelling |
Advancing overpressure quantification methodology for hydrogen ventingJarubenjaluk, AdisaHydrogen -- Safety measuresHydrogenHydrogen ventingDeflagrationDetonationUnconfined and uncongested releaseHydrogen explosionOverpressureHidrogen -- Mesures de seguretatHidrogen -- InflamabilitatÀrees temàtiques de la UPC::Enginyeria químicaA major safety problem at present is the lack of an agreed methodology to estimate blast loads from hydrogen (H2) vents. Of particular interest is the delayed ignition of the flammable clouds that form upon a controlled or uncontrolled release. This study aims to test and improve an existing methodology to enable more accurate prediction of overpressure in hydrogen venting scenarios. Present deflagration model underestimates overpressures by an order of magnitude, whereas the detonation model results in overly conservative estimates albeit useful to retain as an upper limit. While in safety assessments, a certain degree of conservatism is preferred due to the non-negligible potential consequences, estimates should be realistic and in line with the physics that expected to play a role emphasising the need to improve deflagration modelling. Visible flame speed is identified as the most influential parameter in the deflagration model. Modelled estimates based on cloud radius tends to yield slower flame speeds. An alternative approach using the Reynolds number—reflecting the turbulence induced by pressurised gas release—was proposed. The refined methodology was tested against vertical hydrogen release experiments, demonstrating improved overpressure predictions, with 73% of the predictions falling within a factor of four overestimation.Un problema de seguretat clau és la manca d’un mètode estàndard per estimar les càrregues d’explosió derivades de respiradors d’hidrogen, especialment quan hi ha ignició retardada després d’una alliberació. Aquest estudi prova i refina una metodologia existent per predir millor la sobrepressió durant la ventilació d’hidrogen. Els models de deflagració actuals subestimen notablement la sobrepressió, mentre que els de detonació són excessivament conservadors però útils com a límit superior. Tot i que el conservadorisme és habitual per seguretat, les prediccions han de ser realistes i coherents amb la física esperada. Per això cal millorar la modelització de la deflagració. La velocitat de la flama és el paràmetre més influent, i les estimacions basades en el radi del núvol tendeixen a donar velocitats més lentes. Es proposa un enfocament alternatiu basat en el nombre de Reynolds, que reflecteix la turbulència causada per l’alliberament de gas a pressió. La metodologia millorada es va validar amb experiments d’alliberament vertical d’hidrogen, mostrant una millora significativa: el 73% de les prediccions van caure dins d’un factor quatre de sobreestimació.Un problema clave de seguridad es la falta de un método estándar para estimar las cargas de explosión de ventilaciones de hidrógeno, especialmente cuando ocurre una ignición retardada tras la liberación. Este estudio prueba y mejora una metodología existente para predecir mejor la sobrepresión en estos escenarios. Los modelos actuales de deflagración subestiman significativamente la sobrepresión, mientras que los de detonación resultan excesivamente conservadores, aunque útiles como límite superior. Aunque el conservadurismo es común en evaluaciones de seguridad, las estimaciones deben ser realistas y coherentes con la física implicada. Mejorar la modelización de la deflagración es, por tanto, esencial. La velocidad de la llama es el parámetro más influyente, y los cálculos basados en el radio del núcleo tienden a dar velocidades más bajas. Se propone un enfoque alternativo basado en el número de Reynolds, que refleja la turbulencia provocada por la liberación de gas a presión. La metodología refinada se validó mediante experimentos de liberación vertical de hidrógeno, mostrando una mejora clara: el 73% de las predicciones quedaron dentro de un factor cuatro de sobreestimación.OutgoingUniversitat Politècnica de CatalunyaVacca, Pascale20252025-07-0320262026-04-27master thesishttp://purl.org/coar/resource_type/c_bdccNAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/masterThesisapplication/pdfhttps://hdl.handle.net/2117/460999reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:dnet:upcommonspor::f1c8592f9813e50faf6f83badbac8d2a2026-05-27T15:37:01Z |
| score |
15,812429 |