Abstract: This article takes the Chengdu Metro Traditional Chinese Medicine Provincial Hospital Station as the research object, and conducts on-site testing on the effectiveness of the existing auxiliary smoke exhaust system. From the aspects of air valve sealing, auxiliary smoke exhaust mode, and auxiliary smoke exhaust pipeline, the optimization of the existing auxiliary smoke exhaust mode is analyzed, and corresponding optimization plans are proposed. Finally, the feasibility of the optimization plan is verified through on-site testing. The main conclusions are: The airtightness of the combined air valve has a significant impact on the auxiliary smoke exhaust effect; Simultaneously opening both ends of the platform and the middle platform doors to assist in smoke exhaust can effectively solve the problem of uneven wind speed in different positions of escalators, and better meet the requirement of downward airflow of 1.5 m/s for all escalators; When TVF and OTE fans assist in smoke exhaust, there is a mutual cancellation effect at the end door, and only opening the TVF fan for auxiliary smoke exhaust has a better effect; Only opening the platform door on one side of the platform can reduce the air leakage points in the section tunnel and increase the wind speed at the entrance of the escalator.

Key words: double island and four lines, auxiliary smoke exhaust, wind speed measurement, exhaust fan