Theoretical analysis on air velocity characteristics of underground railway platform conditioned by air jet coupled with piston wind

Based on the existing cross-flow theory, develops the mathematical model of coupled velocity field of air jet and piston wind, which is validated by the liquid scale model test with a deviation of 10%. The analytic solution shows that the axis trajectory of coupled jets of the two airstreams can be divided into three phases. Obtains the variation of the angle between the trajectory and the horizontal plane, as well as the variation feature of axis velocity and other characteristic parameters during both the dynamic process and the typical period.