CAFE: A Computer Tool for Accurate Simulation of the Regulatory Pool Fire211 Environment for Type B Packages

摘要

The Container Analysis Fire Environment computer code (CAFE) is intended to211u001eprovide Type B package designers with an enhanced engulfing fire boundary 211u001econdition when combined with the PATRAN/P-Thermal commercial code. Historically 211u001ean engulfing fire boundary condition has been modeled as (sigma)T(sup 4) where 211u001e(sigma) is the Stefan-Boltzman constant, and T is the fire temperature. The CAFE 211u001ecode includes the necessary chemistry, thermal radiation, and fluid mechanics to 211u001emodel an engulfing fire. Effects included are the local cooling of gases that 211u001eform a protective boundary layer that reduces the incoming radiant heat flux to 211u001evalues lower than expected from a simple (sigma)T(sup 4) model. In addition, the 211u001eeffect of object shape on mixing that may increase the local fire temperature is 211u001eincluded. Both high and low temperature regions that depend upon the local 211u001eavailability of oxygen are also calculated. Thus the competing effects that can 211u001eboth increase and decrease the local values of radiant heat flux are included in 211u001ea reamer that is not predictable a-priori. The CAFE package consists of a group 211u001eof computer subroutines that can be linked to workstation-based thermal analysis 211u001ecodes in order to predict package performance during regulatory and other 211u001eaccident fire scenarios.