- Volume 18 Issue 6
When a GTX travels through a deep-level underground tunnel at a speed of 180km/h, ear-discomfort in passengers due to the pressure wave generated could be an issue due to the small cross-sectional area. Therefore, appropriate pressure-tightness values for GTX trains must be secured as a countermeasure. In this paper, a 1D numerical analysis was conducted to determine the pressure-tightness coefficient which allows a pressure change meet the criteria. The pressure transients in a tunnel and in a passenger car are predicted considering an A-line underground tunnel with a length of 37km and its operation schedule. The required pressure-tightness of the car is predicted to be three seconds and 6 seconds respectively for a single track and a double- track tunnel to prevent aural discomfort in passengers. The result of this study are expected to serve as useful information to those involved in the development of various solutions to improve air-tightness of GTX passenger cars.
GTX;Pressure-tightness;Aural discomfort;Pressure change
- www.thermotun.com/thermotun/(Accessed 15 December 2014)
- A. Vardy, A. Haerter (1991) Pressure fluctuations and comfort Criteria on new railways, Aerodynamics and Ventilation of Vehicle Tunnels, pp. 189-204.
- A. Baron, M. Mossi, S. Sibilla (2001) The alleviation of the aerodynamic drag and wave effects of high-speed trains in very long tunnels, Journal of Wind Engineering and Industrial Aerodynamics, 89, pp.365-401. https://doi.org/10.1016/S0167-6105(00)00071-4
- S.W. Nam, H.B. Kwon, S.H. Yun (2012) Characteristics method analysis of wind pressure of train Running in Tunnel, Journal of the Korean Society for Railway, 15(5), pp. 436-441. https://doi.org/10.7782/JKSR.2012.15.5.436
- S.W. Nam (2013) Analysis for characteristics method on wind pressure of trains crossing in tunnel, Journal of the Korean Society for Railway, 16(6), pp. 454-459. https://doi.org/10.7782/JKSR.2013.16.6.454
- S.W. Hong, C. Kim (2009) A new finite volume method on junction coupling and boundary treatment for flow network system analyses, International Journal of Numerical Method in Fluids, published online, DOI: 10.1002/fld.2212, pp. 1-36. https://doi.org/10.1002/fld.2212
- UIC Code 779-11 Determination of Railway tunnel cross-sectional areas on the basis of aerodynamic considerations 2nd edition, 2005.
- H.B. Kwon, S.W. Nam (2012) Comparison of passenger ear discomfort with regard to cabin position when a high-speed train passes through tunnel, Proceeding of Conference of The Korean of society for railway, pp. 1679-1684.
- Guideline of safety criteria for railway vehicle (Ministry of Land, Transport and Maritime Affairs 2009-630).
- S. Werning, B., Gregoire, R., Malfatti, A., Matschke, G. (2002) TRANSAERO: A European Initiative On Transient Aerodynamics for Railway System Optimisation, Springer-Verlag Berlin Heidelberg New York, pp. 342-357.
- S.W. Hong (2010) A new FVM-based analysis on pipeline fluid systems and the industrial application, Ph.D Thesis, Seoul National University.
- S.W. Hong, S.H. Yun, Y.H. Cho, H.B. Kwon (2014) Study on the required air-tightness performance of passenger train operated in the ALine of GTX network, Proceeding Conference of The Korean of Society for Railway, Jeju, pp. 1172-1179.
- J. K. Choi, S.M. Jeong, K.H. Kim (2013) Pressure change inside the train according to an increase in speed of the train travelling in tunnels, Proceeding Conference of The Korean of Society for Railway, pp. 516-524.
- H.J. Oh, D.Y. Shin, S.G. Lee, D.H. Kim, et al.(2012) Numerical study of pressure wave in underground station with vent shaft position, Proceeding Conference of Conference of The Korean of Computational Fluid Engineering, 11, pp. 306-313.
- A. Baron, P. Molteni, L. Vigevano (2006) High-speed trains: Prediction of micro-pressure wave radiation from tunnel portals, Journal of Sound and Vibration, 296, pp. 59-72. https://doi.org/10.1016/j.jsv.2006.01.067
Supported by : 한국철도기술연구원