Abstract
It has been observed that the condensing air flux through the air-conditioning (AC) unit on a running high-speed train significantly decreases due to the shear stream flowing over the train roof. Insufficient condensing air may put the AC under a risk of overheating. In this study, four shapes of flow deflectors that are able to alleviate the flux drop are designed and investigated using experimentally validated Delayed Detached Eddy Simulation (DDES). Numerical results show that the air flux drop mainly depends on the cross-sectional shape of deflectors, which changes the flow conditions above AC condensing outlets, including the properties of the negative pressure region and the incident angle of the high-speed shear flow produced by the train operation. Meanwhile, the extra aerodynamic drag brought by the installation of deflectors is computed and analyzed. The results presented in this paper can be applied to the design of the AC system, as well as other equipment requiring active convective cooling, on higher speed trains.
Published Version
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