Analysis of high-speed train flow structures under crosswind
- 132 Downloads
The flow structures along the length of a High-Speed Train (HST) are experimentally investigated under simulated crosswind conditions. The experiment uses flow visualizations and velocity measurements in a wind tunnel on a HST model at various angles of yaw. Surface visualizations shows the development of a longitudinal vortex, originating at the nose which travels along the leeward side of the train. A hypothesis is presented and tested proposing flow structures may repeat when the Boundary layer (BL) on the roof of the HST reaches maximum development or is “pushed off”. A key motivation is to evaluate the validity of using shortened HST models in a wind tunnel to correctly represent full-length trains. Using this theory, a shortened train model appears unable to completely model full-scale HSTs at realistic yaw angles.
KeywordsAerodynamics Boundary layer Crosswind Flow structures Flow visualization High-speed train Wind tunnel
Unable to display preview. Download preview PDF.
- J. Bell et al., The Effect of Length to Height Ratio on the Wake Structure and Surface Pressure of a High-Speed Train, Melbourne, Australasian Fluid Mechanics Conference (2014).Google Scholar
- Windfinder, Wind & weather statistics Berlin-Tegel., http://www.windfinder.com/windstatistics/berlin-tegel (2015).Google Scholar
- Bureau of Meteorology, Wind Roses for Melbourne, http://www.bom.gov.au/cgi-bin/climate/cgi_bin_scripts/windrose_selector.cgi (2015).Google Scholar
- TFI catalogue, Catalogue section -Cobra Probe, http://www.turbulentflow.com.au/Downloads/Cat_CobraProbe.pdf (2015).Google Scholar
- H. Hemida, S. Krajnovic and L. Davidson, Large-Eddy simulations of the flow around a simplified high speed train under the influence of a cross-wind, 17th AIAA Computational Fluid Dynamics Conference, Toronto, Ontario, Canada, 6-9 June (2005).Google Scholar