Structural optimization of aspirated smoke detectors based on numerical simulation.

Typical aspirated smoke detectors were investigated herein aiming at performance enhancement of aspirated smoke detectors. The adverse effects of airflow turbulence and vortex formation on the precision of smoke detection were mitigated by meticulous adjustment and design optimization of their internal structures. To accurately evaluate the efficacy of these structural improvements, comparative analyses were conducted by using simulation models. The results indicate that fans induce vortex phenomena at both inlet and outlet, removing the filter sponge area exacerbates airflow instability, and a circular arc design for the upper wall significantly improves airflow conditions. Additionally, flow uniformity was analyzed by employing area-weighted and mass-weighted uniformity indices to quantitatively assess the uniformity within the detector's internal flow field. The findings suggest that issues related to internal airflow turbulence and vortex formation can be effectively addressed through refined internal structural designs and wall optimizations, which thereby senhances the detection efficiency and operational stability of the detectors significantly. [ABSTRACT FROM AUTHOR]