Theoretical modeling of the platform piston wind wall jet using field measurements and model testing

Abstract The goal of this study is to create and validate the theoretical model of the platform piston wind wall jet using three methods: mathematical theory modeling, field measurements and a scale model test. The mathematical theory model of the platform piston wind is divided into the initial section and main section of the wall jet. Furthermore, the initial section is composed of a boundary layer, a potential core area and a free shear zone. Using the field measurements, five typical points are selected on a station platform in Shanghai. The field data collected during the train entering station process match well with the theoretical model calculation results, with standard deviations ranging from 0.326 to 0.542. The liquid scale model test is designed to test the theoretical model in the initial section, including the boundary layer, the potential core area and the free shear zone. The standard deviations between the theory calculation and the liquid model test range from 0.071 to 0.746. As a result of these experiments, it can be concluded that the proposed platform piston wind wall jet theory model is correct, which also supports relevant theoretical studies on subway station velocity field.