Advertisement

Micro-pressure Wave Calculation Using Three Dimensional Compressive Fluid Analysis

  • K. Morita
  • Y. Abe
  • Y. Takano
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 118)

Summary

We describe three-dimensional analysis of compressive fluid and three-dimensional scale tests to evaluate and verify the pressure gradient of compression waves that are generated when high-speed trains enter tunnels. We introduce an unstructured mesh and a total variation diminishing (TVD) method to improve the accuracy of calculations. A 1/30 scaled model was adopted in both the calculations and experiment. The traveling velocities of the train model ranged between 270 and 320 km/h. The pressure changes in the tunnel during the experiment were measured to verify the calculation results. The experimental results and calculations agreed well with an accuracy of approximately 10 % in both cases with and without a portal hood. We also confirmed that the installation of a portal hood reduced the pressure gradient by approximately 35% because of the increased duration of elevated pressure.

Keywords

Pressure Gradient Compression Wave Unstructured Mesh Train Model Train Speed 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    Howe, M.S., Iida, M., Fukuda, T., Maeda, T.: Theoretical and experimental investigation of the compression wave generated by train entering a tunnel with a flared portal. J. Fluid Mech. 425, 111–132 (2000)MATHCrossRefGoogle Scholar
  2. 2.
    Abe, Y., Morita, K., Terashima, O.: Evaluation of Micro-Pressure Wave Performance in Tunnels by Scaled Model Experiments and Numerical Calculations. In: 17th Transportation Logistics, Japan Society of Mechanical Engineers (2008) (in Japanese)Google Scholar
  3. 3.
    Miyachi, T., Iida, M., Ozawa, S.: Optimization of tunnel entarance hood for reducing micro pressure wave from long slab-track tunnel portal. In: 17th Environmental Engineering Symposium, Japan Society of Mechanical Engineers (2007) ((in Japanese)Google Scholar

Copyright information

© Springer 2012

Authors and Affiliations

  • K. Morita
    • 1
  • Y. Abe
    • 1
  • Y. Takano
    • 1
  1. 1.Hitachi Research LaboratoryHitachi, Ltd.HitachinakaJapan

Personalised recommendations