International Journal of Railway Research
Iran University of Science & Technology
Fri, Jul 4, 2025
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Volume 12, Issue 1 (1-2025)
IJRARE 2025, 12(1): 55-63 |
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Heydari H, Talaee M, Naseri A. Experimental Investigation the Geometric Properties of Aggregates on Ballast Flight Phenomena of Railway Track. IJRARE 2025; 12 (1) :55-63
URL: http://ijrare.iust.ac.ir/article-1-371-en.html
URL: http://ijrare.iust.ac.ir/article-1-371-en.html
School of Railway Engineering, Iran University of Science and Technology, Tehran, Iran
Abstract: (51 Views)
High-speed railway tracks have expanded significantly across the world in recent years. The increase in train operating speeds imposes considerable aerodynamic forces on the track, which can lead to several technical issues—one of the most important being the ballast flight phenomenon. Among the key factors contributing to ballast flight are the geometric properties of the aggregates, particularly their effective area and particle size. Since there is still limited understanding regarding how geometric properties of the aggregates (e.g. effective area and particle size) impact ballast flight, the present study aims to investigate this issue using a series of wind tunnel tests. The wind tunnel provides a controlled environment to simulate aerodynamic conditions similar to those found in high-speed railways and to evaluate the influence of various parameters on ballast flight behavior. In this study, five different standard ballast gradations defined by the Iranian Standard No. 301 were tested. The findings showed that aggregates with a larger effective area tended to initiate flight at higher airspeeds. Furthermore, an increase in particle size was associated with a higher flight velocity. Among the tested gradations, the ballast with grade No. 4 exhibited the best resistance against ballast flight, indicating its potential as an optimal choice for high-speed railway tracks.
Type of Study: Research |
Subject:
Railway Transportation
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