Investigations on Pressure Relief at Forschungszentrum Rossendorf

The most important activities of the Institute of Safety Research regarding to the development sensors two-phase flow measurement and pressure relief are presented. A new developed electrode-mesh sensor allows a very fast (1024 frames per second) tomographic measurement of the void or gas fraction. The sensor is used e.g. for investigations on the transition between flow regimes. For the transient simulation of pressure relief the BLDN code and the BRICK code are available. The BRICK code bases on a new Particle-In-Cell (PIC) transport model, which avoids numerical diffusion. This is advantageous in case of the consideration of generation and decay of foam. A special interface allows to include a foam model. Investigations on the influence of short living foams on the pressure relief process are presented as well as investigations on pulsations of the mass flow rate, which may occur during the blowdown process under certain conditions.