Numerical analysis of contaminants mixing in a full-scale test chamber

A 3-D and transient numerical model is developed to predict the contaminant transport, based on a full-scale test chamber. The transport process of SF6 gas emission with a constant rate situated at the chamber bottom center is simulated, and the flow field and concentration distribution in the chamber have been obtained. The proposed numerical model based on the test chamber is validated by the experimental data available to the authors. Further, the numerical results show that after ten minutes operation, there are two big vortices in the chamber and in most part of the chamber the pollutant concentration distribution are quite uniform, with a difference in 2-3%. To further increase measurement accuracy for the mean concentration test sensors may be located at some special locations.