The paper shows the results obtained applying the FUMO code to the simulation of TOSQAN 101 and 113 tests, two benchmarks around spray experiments proposed in SARNET network. TOSQAN facility is a 7 m3 well instrumented cylindrical vessel where steam and non-condensable gases can be injected. Tests consist of a water spray injection into this enclosure, initially filled with an air-steam or air-steam-helium mixture: the cold test 113 is dedicated to study the helium mixing due to spray activation while the hot test 101 studies the influence of a cold water injection on an atmosphere previously pressurised with a mixture of air and steam. TOSQAN experimental results provide a significant basis to validate numerical models describing mass and energy exchanges among the containment atmosphere and sprayed droplets. Moreover, they show that the spray water evaporation from the vessel hot structures has not a negligible effect on the overall pressure transient. Different configurations were considered for FUMO simulations, in order to investigate both code capabilities in simulating the internal spray and the effects of the interaction among spray water droplets and vessel structures. The main phenomena highlighted are the atmosphere mixing induced by the spray entrainment and the heat and mass transfer on droplets and walls.
Effects of Spray/Walls Interactions in TOSQAN Tests
PACI, SANDRO;
2008-01-01
Abstract
The paper shows the results obtained applying the FUMO code to the simulation of TOSQAN 101 and 113 tests, two benchmarks around spray experiments proposed in SARNET network. TOSQAN facility is a 7 m3 well instrumented cylindrical vessel where steam and non-condensable gases can be injected. Tests consist of a water spray injection into this enclosure, initially filled with an air-steam or air-steam-helium mixture: the cold test 113 is dedicated to study the helium mixing due to spray activation while the hot test 101 studies the influence of a cold water injection on an atmosphere previously pressurised with a mixture of air and steam. TOSQAN experimental results provide a significant basis to validate numerical models describing mass and energy exchanges among the containment atmosphere and sprayed droplets. Moreover, they show that the spray water evaporation from the vessel hot structures has not a negligible effect on the overall pressure transient. Different configurations were considered for FUMO simulations, in order to investigate both code capabilities in simulating the internal spray and the effects of the interaction among spray water droplets and vessel structures. The main phenomena highlighted are the atmosphere mixing induced by the spray entrainment and the heat and mass transfer on droplets and walls.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
