油介质条件下轮轨黏着特性的试验研究

利用JD—1轮轨模拟试验机研究轮轨受污油、污油水混合物和污油水砂子混合物3种油介质污染工况下,不同轴重和车轮速度对轮轨黏着系数的影响。结果表明:当车速为90km·h-1时,污油和污油水混合物工况时的轮轨蠕滑特性相差不大(加水之后黏着系数减小);污油和污油水混合物工况下21和23t轴重时轮轨黏着系数相差较小,而25t轴重时的黏着系数明显比21和23t轴重时的大,但轮轨表面均未出现严重的磨损;在污油水砂子混合物工况下,轮轨黏着系数显著提高,但同时大大加重了轮轨表面伤损;当轮轨受到污油和污油水污染时,轮轨黏着系数均随着车速的提高而减小。

Experimental Study on Wheel/Rail Adhesion Characteristics under Oil Medium Condition

The effects of different wheel speed and axle load on wheel/rail adhesion coefficient were investigated under three polluted conditions of oil medium,namely,waste oil,the mixture of waste oil and water as well as the mixture of waste oil,water and sand using JD-1 wheel/rail simulation testers.The results indicate that when the train speed is 90 km·h-1,the wheel/rail creep characteristics under waste oil,the mixture of waste oil and water conditions have no obvious difference(Adhesion coefficient decreases when water is added).The difference of wheel/rail adhesion coefficient is smaller when the axle load is 21 and 23 t respectively under waste oil and the mixture of waste oil and water conditions.The adhesion coefficient under 25 t axle load condition is obviously larger than that under the axle loads of 21 and 23 t.However,the wheel/rail surface has no serious damage under different axle load conditions.The adhesion coefficient increases markedly under the mixture of waste oil,water and sand condition.However,wheel/rail surface damage is seriously worsened at the same time.Wheel/rail adhesion coefficient decreases with the increase of train speed when wheel/rail surface is polluted by waste oil and the mixture of waste oil and water.