Numerical study of ADS windowless spallation target based on diffuse interface method

摘要

The study of spallation targets is an important part of ADS system research. Liquid windowless spallation target is the current research hotspot. The working fluid forms a turbulent flow containing gas and liquid in the windowless target, and an accurate prediction of the working conditions is an important part of the study of spallation targets. First, briefly introduce the numerical method of the diffuse interface method, and use water as the working fluid, based on thise method, the four types turbulence model of k-epsilon model, k-omega model, SST model and Spalart-Allmaras model are used to perform the hydraulic numerical calculation of the ADS liquid windowless spallation target. Through experimental comparison and calculation cost comparison, it is found that the k-epsilon model is most suitable for the coupled diffuse interface method to predict the working conditions of windowless spallation targets. At the same time, turbulence analyses are performed on the calculation results of the four turbulence models. Then, continue to use water as the working medium, and use the diffuse interface method and k-epsilon model to perform detailed numerical calculation and analysis of the liquid windowless spallation target. The effects of outlet pressure and inlet velocity on the length of the free interface and the recirculation zone are studied. Finally, using liquid Lead-Bismuth Eutectic as the working fluid, using the diffuse interface method and k-epsilon model, the effects of outlet back pressure and inlet velocity on the height of the free interface and the pressure along the way were studied.