空气湿度对轮轨黏着系数影响研究综述

Review of Research on Influence of Air Humidity on Wheel-rail Adhesion Coefficient

良好的轮轨黏着是列车安全、高品质运行的重要保证,而轮轨黏着又遭受许多外在因素的影响,其中,空气湿度就是其中之一。空气湿度作为轮轨间的第三介质,通过改变轮轨接触表面特性而直接影响轮轨间的黏着,国内外学者就此开展了大量的试验研究、机制分析和数值计算。针对已有的研究成果,阐述空气湿度对轮轨黏着系数影响的试验研究、机制分析和数值计算的研究现状,指出在目前研究中存在未考虑是否形成水膜、试验速度范围较小等问题,并提出今后研究的重点。

Good wheel-rail adhesion is an important guarantee of train safety and high quality running, moreover the wheel-rail adhesion is subjected to many external factors ,among which the air humidity is one of them. Air humidity as the third medium between wheel and rail, by changing the surface properties of the wheel-rail contact, the adhesion between wheel and rail is affected directly. A great deal of experiments, mechanism analysis and numerical calculation were conducted for this by domestic and foreign scholars. Aimed at the existing research results, the experimental research, mechanism analysis and numerical calculation of the research status were expounded. It was pointed out that in the present study, whether to form a water film, the smaller range of test speeds and other issues were not considered, as well as put forward the focus of future research.