Study on the influence of HRD on aerodynamic heat diffusion of VTT system under different blocking ratios

摘要

A novel building structure for preventing energy accumulation, heat recycle duct (HRD) was proposed in Vacuum Tube Transportation (VTT) system. Based on the computational fluid dynamics (CFD) technique, this study captures the thermodynamic properties of VTT with and without HRD at distinct obstructing proportion and train speed using the Fluent, dynamic grid method from three aspects: system blocking ratio, HRD interval length, and opening width. The findings show that, relative to the generic VTT, one with HRD can efficiently decrease the relative temperature between the head and tail of trains. he differential temperature here between train head and tail increases when the interval length of the HRD increases. The differential temperature decreases as the opening width of the HRD increase as the system pressure, blocking ratio, train running speed, and HRD interval length are fixed. The analysis indicates that the new building structure serves a very significant role in alleviating the aerodynamic heat accumulation of VTT.