Abstract
The installation of decentralized air purifiers is a solution for ventilation-constrained urban tunnels; however the interaction between the purified airflow and the tunnel ventilation airflow has rarely been revealed. In this study, the coupled flow characteristics of air purifiers in the upper space and longitudinal ventilation are numerically analyzed. The accessibility of supply air (ASA) and accessibility of contaminant source (ACS) indicators are used to evaluate the effectiveness of purified airflow and the impact of vehicle pollution sources. The effects of purifying air volume, number of purifiers, and distance between purifiers on pollution removal are revealed. The results show that the stratification of tunnel airflow results in the purified airflow acting mainly in the upper space. The increase in purifying air volume and the number of purifiers expands the dominant range of purification, however does not significantly reduce pollution in the lower space. Short-circuiting problem tends to occur when the downstream purifier extracts clean airflow from the upstream purifier. Smaller purifying air volume and greater purifier spacing help to mitigate short-circuiting, and the ACS at the downstream purifier inlet can be increased from approximately 0.3 to more than 0.5. This study provides guidance for the configuration of decentralized air purifiers.
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