轮轨界面颗粒夹带的 CFD-DEM 建模:关于列车特性的参数研究

IF 2.3 3区 工程技术 Q2 MECHANICS
Sadaf Maramizonouz, Sadegh Nadimi, Roger Lewis
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引用次数: 0

摘要

钢轨打磨是为了改善列车在低附着力条件下的轮轨牵引力损失。在低附着力条件下,轮轨牵引力损失会严重影响列车的运动、运行和性能,阻碍列车的加速和减速,从而导致运输系统的延误和不稳定性,并造成安全风险,最严重的情况下还会导致列车相撞。轨道打磨在恢复轮轨牵引力方面有其自身的优点,但由于其夹砂效率较低,会造成 80% 以上的砂子浪费。在这项研究中,计算流体动力学与离散元件建模相结合,研究了砂粒在轨道打磨过程中的行为。通过比较砂粒的夹带效率,进行了基于列车特性(包括列车速度、砂流速和砂光机喷嘴的几何形状)的参数研究。研究发现,砂流速度超过 30 米/秒时,夹带效率几乎为零。在车轮与导轨接口处产生的移动空气层影响了可接受粒度范围的下限。可以设计流速和喷嘴几何形状来提高夹带效率。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

CFD-DEM modelling of particle entrainment in wheel–rail interface: a parametric study on train characteristics

CFD-DEM modelling of particle entrainment in wheel–rail interface: a parametric study on train characteristics

Rail-sanding is employed to improve the train’s wheel–rail traction loss in low adhesion conditions. This can significantly impede trains’ kinematics, operation, and performance by hindering the train’s acceleration and deceleration, resulting in delays and unreliability of transport system as well as causing safety risks and in the worst cases train collisions. Rail-sanding has its own merits in recovering the wheel–rail traction but can result in a sand wastage of more than 80% due to its low sand entrainment efficiency. In this research, computational fluid dynamics is coupled to discrete element modelling to study the behaviour of sand particles during rail-sanding. A parametric study based on the train characteristics, including train velocity, sand flow rate, and the geometry of the sander nozzle, is performed by comparing the entrainment efficiency of the sand particles. It is found that train velocities over 30 m/s result in the entrainment efficiency of almost zero. A moving air layer generated at the wheel–rail interface influences the lower bound of acceptable particle size range. The flow rate and nozzle geometry can be designed to enhance entrainment efficiency.

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来源期刊
Acta Mechanica
Acta Mechanica 物理-力学
CiteScore
4.30
自引率
14.80%
发文量
292
审稿时长
6.9 months
期刊介绍: Since 1965, the international journal Acta Mechanica has been among the leading journals in the field of theoretical and applied mechanics. In addition to the classical fields such as elasticity, plasticity, vibrations, rigid body dynamics, hydrodynamics, and gasdynamics, it also gives special attention to recently developed areas such as non-Newtonian fluid dynamics, micro/nano mechanics, smart materials and structures, and issues at the interface of mechanics and materials. The journal further publishes papers in such related fields as rheology, thermodynamics, and electromagnetic interactions with fluids and solids. In addition, articles in applied mathematics dealing with significant mechanics problems are also welcome.
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