Numerical Investigation on Critical Tunnel Length of Maximum External Pressure Change of High-Speed Train
Abstract
This study describes the numerical investigations to estimate the critical tunnel length. A one-dimensional compressible unsteady non-homentropic flow model, and method of characteristics of generalized Riemann variables is adopted. Then, the critical tunnel length of 1) maximum positive pressure change, 2) maximum negative pressure change and 3) peak-peak pressure change is obtained. The difference between obtained critical tunnel length of maximum positive pressure change and maximum negative pressure change and that from formulas of EN 14067-5 and other scholar is investigated. The comparison shows that the critical tunnel length by our method is close to the formulas. In addition, the critical tunnel length of peak-peak pressure change which is more helpful to the fatigue design of train body and components is delivered. The method in this paper has been proved to be an efficient approach to obtain the critical tunnel length.
DOI
10.12783/dtetr/icia2017/15665
10.12783/dtetr/icia2017/15665
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