Numerical study on the effect of a downstream braking plate on the detailed flow field and unsteady aerodynamic characteristics of an upstream braking plate with or without a crosswind
Jiqiang Niu, Yueming Wang, Feng Liu, Rui Li
Abstract
A DDES based on the SST κ–ω turbulence model was used to simulate the aerodynamic characteristics of a braking plate, and the aerodynamic forces on the plate, the flow structure around the plate and the effect of opening a downstream plate on aerodynamic characteristics of the braking plates were analysed. Some results show that opening the downstream plate significantly decreases both the value and fluctuation of the aerodynamic forces for cases without crosswind; the maximum decreases can be up to 14.19% and 72.15%, respectively, and the effect of opening the downstream plate on the value and fluctuation of the aerodynamic forces on the upstream plate and base are aggravated and weakened by crosswind, respectively. For cases without crosswind, the flow field distribution law (velocity and pressure) around plates is not affected by opening the downstream plate, but their amplitude is obviously affected by opening the downstream plate. A crosswind significantly changes the flow field around the plates and base and strengthens the effect of opening the downstream plate on the flow field around models. Therefore, opening the downstream plate may weaken the effect of aerodynamic braking, and the location of the downstream plate relative to the upstream plate should be carefully considered.