Temperature field characteristics of slab ends of double-block ballastless track in large daily temperature difference region

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-02-12 DOI:10.1016/j.csite.2025.105858

Youxin Wei , Yu Liu , Bin Yang , Shiping Zhang , Yanxi Zhao

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引用次数: 0

Abstract

In regions with large daily temperature differences, double-block ballastless tracks have experienced severe interface damage and warping deformation at the slab ends. A new indoor experiment was conducted on the track structure, simulating temperature variations through controlled air temperatures. Cross-sectional infrared data was analyzed to explore overlooked temperature field characteristics of slab ends. Combined with numerical simulations, the temperature field of the track slab was further analyzed. The results show that the daily temperature difference within the slab interior is significantly less than 50 % of that in the ambient air, whereas the daily temperature difference within a 60 cm range at the slab ends is much higher. Notably, the outermost 30 cm of the slab ends experiences a daily temperature difference that is 6–7 °C greater than that within the slab interior. The temperature gradient distribution at the slab ends displays a complex pattern, deviating from the typical top-to-bottom decreasing trend. Moreover, the maximum vertical overall temperature gradient across the track slab reaches approximately 30 °C/m. To enhance the adaptability of double-block ballastless tracks to harsh temperature environments, optimization of expansion joint settings and adjustment of design value for negative temperature gradient are recommended.

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.