Numerical Study on Thermal Hydraulic Characteristics of Containment Spraying Experiment in COHERE Facility

Abstract The containment spray system is designed to control the pressure rise and avoid overpressure risk by condensing the steam in severe accidents. To study the containment thermal-hydraulic response characteristics after spraying, the spray experiment has been performed in COHERE facility. During the experiment, the spray droplet particle size, relative humidity, space pressure and temperature was measured. This paper has performed the transient numerical simulation on the containment spray experiment by FLUENT. The particle trajectory model attached in Eulerian-Lagrange method is used to numerically simulate gas-liquid flow. The DPM (Discrete Particle Model) is applied to simulate the spray droplet particles behavior including motion, mass and heat transfer. The steam condensation is considered by adding the mass and heat equation source through UDF (User Defined Function). The comparison between the experimental data and calculation result has shown that, 1) the phenomena of steam condensation after spraying is well simulated by FLUENT; 2) the DPM model and the condensation consideration can simulate the thermal hydraulic characteristics such as the pressure and temperature decrease after spraying and control the relative humidity.