Aerodynamic characteristics of a double-deck car ultra-high-speed elevator with cavity space structure

When the ultra-high-speed elevator with a double-deck car runs at high speed in the hoistway, its inherent cavity space structure causes complex airflow changes. It forms an eddy current structure, significantly affecting the double-deck car's stable operation. In order to solve this problem, this paper first analyzes the cavity space structure in the double-deck car hoistway, establishes the full-process double-deck car wind tunnel model (FDDC-WT model), and carries out experimental verification. Then, the cavity flow field in the well is divided into regions, and the vortex evolution process, velocity, and pressure characteristics of the airflow around the car are analyzed by three-dimensional numerical simulation. Finally, the influence of key structural parameters on the aerodynamic load of the double-deck car is studied. The results show that the flow into the cavity produces a complex velocity gradient change and pressure recovery phenomenon. With the blockage ratio increasing three times, the resistance of the upper car increases by 20.8%, 21.4%, and 77.6%, and the resistance increment increases significantly. The lift fluctuation of the lower chamber increases by 11.9%, 7.5%, and 1.3%, and the lift fluctuation increases gradually with the third equivalent increase in the chamber height. This study mainly analyzes the influence of the inner cavity structure of a double-deck car hoistway on the aerodynamic effect, which provides important theoretical support for the aerodynamic performance optimization of a double-deck car ultra-high-speed elevator.