Axisymmetric, Turbulent Flow Analysis of Contaminant Infiltration into aPressurized Structure with a Fabric Endcap

摘要

The problem of contaminant transport by turbulent flow and its infiltration intoa fabric structure pressurized with uncontaminated air is studied for axisymmetric flow. A modal for turbulent pipe flow having a concentric, pressurized chamber, with a fabric endcap, placed axially within the pipe is developed. Contaminated air enters the pipe and is transported down the pipe. Some of the contaminated air is transported through the fabric and is dispersed within the pressurized chamber. The effect of forcing uncontaminated air into the chamber on the infiltration and dispersion of contaminated air is studied. The particular formulation that is used in this study is the two-equation model of turbulence. The SIMPLER algorithm and code that were used in earlier laminar flow studies have been modified to Incorporate the two-equation model. The fabric is considered to be passive. Comparisons with experimental results show that not all fabrics can be considered as passive because their properties change with the level of contamination.