In this study, a smoke detector algorithm combined with two different characteristic lag time models (Cleary et al.model and Heskestad model) was studied and implemented into a large eddy simulation fire modeling code. These two detector models were compared with each other in a numerical wind tunnel over a range of different velocities.
The models were also compared with the temperature correlation method of Heskestad and Delichatsios and experimental data from a multi-room compartment fire. In general, the filling times (dt and t) represent the characteristics of the model smoke detector, which strongly depend on the velocity at the detector location. When the velocity is relatively high (40.2 m/s), both sets of different characteristic time detector models (Cleary et al. model and Heskestad model) gave similar activation time predictions. However, significant differences in the activation time