Numerical study on the characteristics of temperature distribution in continuous welded rail by solar radiation and rail
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DOI 10.1007/s12206-020-1038-y
Journal of Mechanical Science and Technology 34 (11) 2020 Original Article DOI 10.1007/s12206-020-1038-y Keywords: · Buckling · Rail orientation · Rail temperature · Solar radiation
Numerical study on the characteristics of temperature distribution in continuous welded rail by solar radiation and rail orientation Sang Hyeon Han1, Su Ha Hwang2, Hong Jip Kim3, Seong J. Cho3 and Nam Hyoung Lim4
Correspondence to: Hong Jip Kim [email protected]
Citation: Han, S. H., Hwang, S. H., Kim, H. J., Cho, S. J., Lim, N. H. (2020). Numerical study on the characteristics of temperature distribution in continuous welded rail by solar radiation and rail orientation. Journal of Mechanical Science and Technology 34 (11) (2020) 4819~4829. http://doi.org/10.1007/s12206-020-1038-y
Received April 8th, 2020 Revised
July 20th, 2020
Accepted August 6th, 2020
1
Department of Mechanical Engineering, Graduated School, Chungnam National University, Chungnam, 2 3 Korea, Defense Agency for Technology and Quality, Gyeongnam, Korea, School of Mechanical Engi4 neering, Chungnam National University, Chungnam, Korea, Department of Civil Engineering, Chungnam National University, Chungnam, Korea
Abstract
In summer, the high ambient air temperatures and increased solar radiation cause rises in rail temperatures, and rails can experience the buckling. In this study, a thermofluidic analysis was conducted to predict the temperature of a rail. Numerical simulations were performed by changing the orientation of the rails. The south-north rail and the east-west rail was named “0° rail” and “90° rail”, respectively. The numerical results from the 0° and 90° rails were validated by comparing them with measured values. Based on this validation, the temperature distribution of a 45° rail was analyzed. The total amount of energies received by the rail were in the order of 0° > 45° > 90°. The results of this study showed that the temperature of a rail can be sufficiently predicted through numerical simulation, and this approach can be used in a forecast to predict a time when buckling might occur.
† Recommended by Editor Yong Tae Kang
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Owing to the nature of continuous welded rails (CWRs), it is very important to measure rail temperatures for safe train operation. There are two types of rails: CWRs and standard-length rails (SLRs). The SLR is a rail with a standard length, and a track consisting solely of SLRs will produce a joint between the rails. The noises and vibrations in trains caused by joints are the main causes of damage to the vehicle and track, leading to increased maintenance costs, and making passengers uncomfortable. To overcome these problems, CWRs are widely used, especially for high-speed trains. The CWR is a key technology used in the construction of highspeed rails and is continuously welded with SLRs to remove joints [1, 2]. The main problem with CWRs is that the compressions a
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