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Simultaneous application of spontaneous Raman scattering and LDV, PIV for steam/air flow characterization.

E. Porcheron, L. Thause, J. Malet, P. Cornet, Ph. Brun, J. Vendel, 10th International symposium on flow vizualization, 26-29 aout 2002, Kyoto, Japon.

Summary

During the course of an hypothetical severe accident in a Pressure Water Reactor (PWR), hydrogen can be produced by the reactor core oxidation and distributed into the reactor containment according to convection flows and water steam wall condensation. In order to assess the risk of detonation generated by a high local hydrogen concentration, hydrogen distribution in the containment has to be known. The TOSQAN experimental program has been created to simulate typical accidental thermal hydraulic flow conditions in the reactor containment and to study different phenomena such as water steam wall condensation in the presence of non -condensable gases. The aim of this study is to present coupled Spontaneous Raman Scattering (SRS) and laser velocimetry measurements to obtain simultaneously gas volume fraction and velocities during water steam injection in a large enclosure. Velocity measurements are performed using Laser Doppler Velocimetry (LDV) and Particles Images Velocimetry (PIV). Few studies are available in the literature showing the possibility of making measurements of concentration in parallel with velocity measurements. Such an example has been carried out by Borg et al., (2001) realized by associating the PIV technique for the measurement of field speed and the Planar Laser-Induced Fluorescence for concentrations measurement. This work has been done with the collaboration of ADULIS.

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