Piston effectpiston effect is a term describing the airflow induced when a vehicle or vehicles move in a tunnel. It is especially important for subwaysubway tunnels because of high ratio of a vehicle cross section area to the tunnel cross section area (called blockage ratio). This effect must be taken into account when designing ventilation system for subway stations or considering subwaysubway fire safety issues. The work showed that for a single train in a narrow one-track tunnel the induced airflow velocity reached up to 10 m/s and for a single train in a wider two-track tunnel the air velocity is lower and reached up to 6 m/s. Meanwhile when two trains move in a two-track tunnel in the opposite directions the induced airflow may be completely neglected. Hence, if air movement due to the piston effectpiston effect is accounted in the ventilation program it should be correlated with actual trains schedule.
Numerical Investigation on the Piston Effect in Subway Tunnels
Lect. Notes in Networks, Syst.
Scientific And Technical Conference Transport Systems Theory And Practice ; 2022 September 07, 2022 - September 07, 2022
Advanced Solutions and Practical Applications in Road Traffic Engineering ; Chapter : 7 ; 108-119
2023-01-01
12 pages
Article/Chapter (Book)
Electronic Resource
English
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