基于全尺寸试验台的水介质条件下高速轮轨黏着特性试验研究

基于全尺寸高速轮轨关系试验台,模拟轮轨接触界面在水介质条件下的轮轨黏着特性,研究喷水量、轮轨接触表面粗糙度、喷水温度、轴重和运行速度对水介质条件下高速轮轨黏着系数的影响规律。结果表明:水介质条件下,喷水量、轮轨接触表面粗糙度、运行速度对轮轨黏着系数影响较大,喷水温度和轴重对其影响较小;随喷水量的增加轮轨黏着系数逐渐减小,但当喷水量达到200mL·min-1后黏着系数不再减小;随着表面粗糙度的增加,运行速度对轮轨黏着系数的影响逐渐减弱,表面粗糙度增至1.0～1.1μm时运行速度对轮轨黏着系数的影响很小;在40～200km·h-1速度范围内,轮轨黏着系数随速度的增加减小得较快,而在200～400km·h-1速度范围内减小得较为缓慢;轮轨黏着系数随喷水温度的升高而增大,喷水温度为0℃(下雪)时的轮轨黏着系数较常温时下降11%～15%;轮轨黏着系数随轴重的增加而减小,在动车组常用轴重10～16t范围内轴重对轮轨黏着系数的影响只有10%左右。

Experimental Study on Adhesion Property of High Speed Wheel and Rail in Wet Condition by Full Scale Roller Rig

Tests were conducted to study wheel-rail adhesion characteristics in wet condition by high speed full scale roller rig of wheel/rail interface. The influential factors on the high speed wheel-rail adhesion coefficient in wet condition were investigated, which included the water spray amount, wheel-rail contact surface roughness, water spray temperature, axle load and running speed. Test results indicate that the water spray amount, wheel-rail contact surface roughness and running speed influence relatively heavily on the adhesion coefficient in wet condition, while the water spray temperature and axle load influence it relatively lightly. The wheel-rail adhesion coefficient decreases gradually with the increase of water spray amount, but when the water spray amount reaches 200 mL ·min^-1 , the adhesion coefficient will no longer decrease. With the increase of surface roughness, the influence of running speed on wheel-rail adhesion coefficient is gradually weakened, and becomes very small when the surface roughness increases to 1.0~1.1 μm. In the speed range from 40 to 200 km·h^-1 , the wheel-rail adhesion coefficient decreases rapidly with the increase of speed, but decreases slowly in the speed range from 200 to 400 km·h^-1 . The wheel-rail adhesion coefficient increases with the increase of water spray temperature, and it is 11%~15% lower than that at normal temperature when the water spray temperature is 0℃(snowfall temperature). The wheel-rail adhesion coefficient decreases with the increase of the axle load, and in the regular axle load range from 10 t to 16 t, the influence of the axle load on the adhesion coefficient is only about 10%.