中国铁道科学2026，Vol.47Issue(2)：1-11,11.DOI:10.3969/j.issn.1001-4632.2026.02.01
基于PIV的有砟道床周围沙粒运动学特性研究
Study on Kinematic Characteristics of Sand Particles around Ballasted Beds Based on PIV
摘要
Abstract
Sand intrusion into ballasted beds seriously threatens their long-term stability and operational safety.Based on wind tunnel experiments and particle image velocimetry(PIV),this study investigated the movement of sand particles around ballasted beds in a wind-sand environment by systematically measuring and analyzing the spatiotemporal evolution of particle velocity fields,directional distributions,and flux transport.The results show that,when the wind-sand flow passes through the ballast-rail system,the flow field structure changes significantly,exhibiting clear velocity stratification and flow direction reorganization.The particle motion direction undergoes a typical evolution process of convergence,deflection,chaos,and recovery along the flow path.The directional concentration decreases from 0.959 on the windward side to 0.200 in the inter-rail region,and then rises to 0.639 on the leeward side.The particle flux attenuates by about 48%along the path,while near-surface deposition is significant,with the proportion of downward-moving particles generally exceeding 60%at all measurement positions.The ballasted bed affects wind-sand transport through the combined mechanisms of energy dissipation and screening:energy dissipation continuously weakens the sand-carrying capacity of the airflow,while the screening effect promotes sand deposition within the ballast layer.关键词
有砟道床/砂粒侵入/风洞试验/粒子图像测速/运动学特性Key words
Ballasted bed/Sand intrusion/Wind tunnel test/Particle image velocimetry/Kinematic characteristics分类
交通工程引用本文复制引用
石龙,苏丽君,韩峰,马学宁,朱兆荣,李寿图,郭兴铎..基于PIV的有砟道床周围沙粒运动学特性研究[J].中国铁道科学,2026,47(2):1-11,11.基金项目
兰州交通大学青年科学基金资助项目(2024033) （2024033）
中央引导地方科技发展资金项目(24ZYQA044) （24ZYQA044）
中国国家铁路集团有限公司科技研究开发计划课题(N2023X050) （N2023X050）
