Publicação
Dynamics in fire-induced ceiling-jet
| Resumo: | The aim of this thesis is to test the ability of some correlative models to recover both dynamic and thermal characteristics of a fire induced ceiling-jet flow. The flow occurs when the fire plume impinges the ceiling and develops in the radial direction of the fire axis. These correlative models were also compared with a two-zone model (CFAST) and with an advanced calculation method (Computational Fluid Dynamics) for the calculation of the temperature and velocity near the ceiling. These calculations were developed inside an open car park, using different fire events (localized fires). Both temperature and velocity predictions are decisive for sprinklers positioning, fire alarms positions, detectors positions and activation times and back-layering predictions. Simple graphs were depicted for the time of the fire event and another ones were depicted for the maximum value expected during the fire event. Some correlative models agree well with the results obtained with CFAST. The CFD results over predicted the dynamics of the fire events. |
|---|---|
| Autores principais: | Nechab, Khadouma |
| Assunto: | Fire Correlative models CFAST ANSYS FLUENT Localized fires Plume and Ceiling jet fires Fire scenario Two zone models |
| Ano: | 2017 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Bragança |
| Idioma: | inglês |
| Origem: | Biblioteca Digital do IPB |
| Resumo: | The aim of this thesis is to test the ability of some correlative models to recover both dynamic and thermal characteristics of a fire induced ceiling-jet flow. The flow occurs when the fire plume impinges the ceiling and develops in the radial direction of the fire axis. These correlative models were also compared with a two-zone model (CFAST) and with an advanced calculation method (Computational Fluid Dynamics) for the calculation of the temperature and velocity near the ceiling. These calculations were developed inside an open car park, using different fire events (localized fires). Both temperature and velocity predictions are decisive for sprinklers positioning, fire alarms positions, detectors positions and activation times and back-layering predictions. Simple graphs were depicted for the time of the fire event and another ones were depicted for the maximum value expected during the fire event. Some correlative models agree well with the results obtained with CFAST. The CFD results over predicted the dynamics of the fire events. |
|---|