SIMULATION OF MULTI-PHASE FLOWS WITH·SOLID PARTICLE BED IN A WATER POOL

摘要

In order to model the mobility of the postulateddisrupted core in a core disruptive accident (CDA) ofa liquid metal cooled faster reactor (LMFR) andprovide data for the verification of a safety analysiscode, SIMMER-III, a series of preliminaryexperiments was performed to simulate the behaviorof a solid particle bed in a water pool against pressuretransients. Numerical simulations on theseexperiments using SIMMER-III code were alsoperformed. Simulation results were compared withexperimental results to verify the validity of theSIMMER-III code with the particle jamming modeland the particle viscosity model. The comparisonshows that SIMMER-III can well represent thepressure transients, gas volume change in the waterpool and pressure vessel, as well as the surface heightchange of the particle bed in the first nitrogen gasexpansion period. It also gives an earlier pressuretransient than the corresponding experimental resultand in turn the disagreement in the gas volumechange in the subsequent period accompanying thefirst transient process of expansion.