Investigations of bi-directional flow behaviour in presence of a large vertical opening in a fire compartment
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P. K. Sharma
Abstract
In the complex thermal hydraulics codes developed for fire, reactor and containment safety the junctions in the multi-compartment geometries are often modeled as uni-directional junctions and some construct of flow coefficient. However, certain large size junctions are known to depict bi-directional flow behaviour under specific circumstances. The CFD based computer code FDS was used for an earlier reported study of fire in an enclosure on the bidirectional flow behaviour in present of a wall opening. Numerical simulation is directed to monitor the entrainment of the fresh air from outside to the fire compartment and resulting plume deflection due to presence of a big opening. The paper presents the details of the analysis, the results obtained, and comparison with the reported experimental data in terms of plume deflection, entrainment. Detailed investigations have been carried out to understand the bi-directionality of a junction by analyzing studying the outgoing hot air flow and incoming cold air.
Kurzfassung
In den Thermohydraulik-Rechencodes, die für die Brandanalyse und für die thermohydraulische Analyse des Containments entwickelt wurden, werden die Nahtstellen in den Multi-Kompartment-Geometrien oft als unidirektionale Übergänge modelliert. Deckenanschlüsse zeigen jedoch unter gewissen Umständen bidirektionales Strömungsverhalten. Der CFD basierte Rechencode Fire Dynamics Simulator (FDS) wurde in einer früheren Brandstudie verwendet zur Berechnung des bidirektionalen Strömungsverhalten bei Vorhandensein einer Wandöffnung. Die numerische Simulation dient der Überwachung des Einzugs von Frischluft von außerhalb des Brandabschnitts und der Abluftfahne aufgrund einer großen Öffnung. Die vorliegende Arbeit stellt die Einzelheiten der Analyse dar, die erhaltenen Ergebnisse und ein Vergleich mit experimentellen Daten. Detaillierte Untersuchungen wurden durchgeführt um die Bidirektionalität einer Nahtstelle zu verstehen durch Analyse der rausgehenden heißen Luftströmung und der reinkommenden kalten Luftströmung.
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© 2011, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Stress analyses for reactor pressure vessels by the example of a product line '69 Boiling Water Reactor
- Multiple condensation induced water hammer events, experiments and theoretical investigations
- Simulation of load following mode of operation for a natural circulation pressure tube type BWR
- CANDU fuel elements behaviour in the load following tests
- Local heat transfer coefficient near the spacer grids
- Best estimate analysis of PHEBUS FPT1 experiment bundle phase using ASTEC code ICARE module
- Investigations of bi-directional flow behaviour in presence of a large vertical opening in a fire compartment
- CANDU reactors with reactor grade plutonium/thorium carbide fuel
- Novel method to produce 109Cd via proton irradiation of electroplated silver on a gold-coated copper backing
- Technical Notes/Technische Mitteilungen
- Atmospheric dispersion of accidental release of radioactive gases from high enriched and low enriched fuel of Miniature Neutron Source Reactors (MNSR)
- Fuel burnup of modified fuel assembly configurations for a small medical reactor
- Determination of natural uranium, thorium and radium isotopes in water and soil samples by alpha spectroscopy
Articles in the same Issue
- Contents/Inhalt
- Contents
- Summaries/Kurzfassungen
- Summaries
- Technical Contributions/Fachbeiträge
- Stress analyses for reactor pressure vessels by the example of a product line '69 Boiling Water Reactor
- Multiple condensation induced water hammer events, experiments and theoretical investigations
- Simulation of load following mode of operation for a natural circulation pressure tube type BWR
- CANDU fuel elements behaviour in the load following tests
- Local heat transfer coefficient near the spacer grids
- Best estimate analysis of PHEBUS FPT1 experiment bundle phase using ASTEC code ICARE module
- Investigations of bi-directional flow behaviour in presence of a large vertical opening in a fire compartment
- CANDU reactors with reactor grade plutonium/thorium carbide fuel
- Novel method to produce 109Cd via proton irradiation of electroplated silver on a gold-coated copper backing
- Technical Notes/Technische Mitteilungen
- Atmospheric dispersion of accidental release of radioactive gases from high enriched and low enriched fuel of Miniature Neutron Source Reactors (MNSR)
- Fuel burnup of modified fuel assembly configurations for a small medical reactor
- Determination of natural uranium, thorium and radium isotopes in water and soil samples by alpha spectroscopy
