A validated numerical investigation of the effects of high blockage ratio and train and tunnel length upon underground railway aerodynamics

Daniel Cross, Ben Hughes, Derek Ingham, Lin Ma

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)
6 Downloads (Pure)

Abstract

In order to ensure the safety and comfort of passengers and staff, an underground railway requires an extensive ventilation and cooling system. One mechanism for underground railway ventilation is the movement of air induced by trains, termed the 'piston effect'. This study investigated the effect of altering the blockage ratio of an underground train upon the ventilating air flows driven by a train. First a computational model was developed and validated with experimental data from literature. This model was scaled to represent an operational underground railway with high blockage ratio and the blockage ratio varied to evaluate the effects upon ventilation. The results of this study show that ventilating air flows can be increased significantly during periods of constant train motion and acceleration, by factors of 1.4 and 2 respectively, but that the train drag will increase at the same rate. During deceleration negligible increases in ventilation flows are found but drag increases by a factor of 4.

Original languageEnglish
Pages (from-to)195-206
Number of pages12
JournalJournal of Wind Engineering and Industrial Aerodynamics
Volume146
Early online date1 Oct 2015
DOIs
Publication statusPublished - 1 Nov 2015

Keywords

  • aerodynamics
  • computational fluid dynamics
  • high blockage ratio
  • underground railways
  • ventilation

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