Study on Experimental Simulation of Sanding Process for Train Wheel-rail Improving Adhesion and Sanding Effect

doi:10.3901/JME.2023.22.424

Abstract

Abstract: As an important method to ensure the safe and reliable operation of the train, the improving adhesion by wheel-rail interface sanding is a dynamic and complex process, which involves the jetting behavior of particles after acceleration from the sanding device, the ejection behavior of sand particles entering the wheel-rail interface after jetting, improving adhesion after crushing and friction and wear behaviors. Based on the relative motion relationship between wheel and rail during train operation, a 1∶1 full-scale simulation device for sanding process for train wheel-rail improving adhesion is designed and developed, and the visual detection and analysis technology of sanding process is constructed, which realizes real simulation and detection of sanding process for wheel-rail improving adhesion under different train speeds (0～120 km/h), crosswind velocity (0～15 m/s), types of sanding spreader, installation positions of nozzles, characteristics of improving adhesion particles, sanding parameters conditions. The experiments of sand particle jetting behavior and particle utilization rate were carried out by venturi sanding spreader. The results show that under no cross wind condition, the jetting trajectory of sand particles basically presents a cone shape. With the increase of sand particle size, the particle jetting speed shows a decreasing trend. The fluidity becomes worse in the jetting process, which makes it more difficult to enter the wheel-rail interface and reduces the utilization rate of sand particles. As the cross wind velocity increases, the maximum offset angle of the sand particles jetting trajectory also gradually increases. In future, the developed and designed simulation device and detection technology can be used to study the influencing factors and key parameters of train sanding improving adhesion, which to provide key support for the optimization and improvement of on-site train sanding improving adhesion and the setting of sanding technical standards.

Key words: wheel-rail improving adhesion, sanding simulation device, sanding effect, particle jetting speed, particle utilization rate

CLC Number:

TH117

WANG Wenjian, YUE Ziheng, XIANG Pengcheng, DING Haohao, LIN Qiang, CHEN Yong, GUO Jun, LIU Qiyue. Study on Experimental Simulation of Sanding Process for Train Wheel-rail Improving Adhesion and Sanding Effect[J]. Journal of Mechanical Engineering, 2023, 59(22): 424-432.

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