Wind Tunnel Studies on the Prevention of Particle Accumulation Onto the Bogie of High-Speed Train

Yusheng Liu,Jie Zhang,Guang Li

doi:10.3389/feart.2022.829309

Abstract

When high-speed train runs in the environment with a large number of airborne particles, these particles may accumulate on the bogie of the train, which will further challenge the normal operation of the bogie and reduce the riding comfort and train safety. In order to prevent particles entering into the bogie area, different protective devices around the bogie are used. However, up to present, the systematical analysis on the protective effects of diverse protective measures against different types of particles are still very limited. In this study, with the widely-used shirt boards and spoilers as protective devices, the airborne particle transport processes around the bogie were simulated in the wind tunnel Lab. Three kinds of typical particles, including artificial snow particle, wheat bran (substitute of snowflake) and sieved soil, were chosen to represent different airborne particles under real conditions. Three evolution indexes, including the relative reduction ratio of artificial snow particles, the relative particle flux reduction ratio of fine wheat bran, and the relative concentration reduction ratio of fine sieve soil particles, were used to assess their protective effects. Results showed that the combination of short-skirt board and straight triangular spoiler (i.e., in A5 case, the straight triangle spoilers installed at the front and rear ends of the train bogie, and the short-skirt boards installed on both sides of the train bogie) was the best protection with the studied three particles. The relative reduction ratio of the average snow mass in this case was 75.59%, the relative reduction ratio of the flux in the level of fine wheat bran exceeded 78%, and the relative reduction ratio of the fine soil particle concentration was more than 96%.

Highlights

When high-speed train runs in the environment with a large number of airborne particles such as dust (Tian, 2015; Wang et al, 2017) or snow (Vajda et al, 2014; Wu et al, 2019), these particles may enter the bogie area and affect the normal operation of the components inside the bogies
The reduction ratios of average accumulated snow mass in A5 with short-skirt boards and straight triangular spoilers, A4 without short-skirt board but with straight triangular spoilers, and A2 without short-skirt board but with oblique triangular spoilers were RM5 = 75.59%, RM4 = 69.79%, and RM2 = 67.08%, respectively. Results showed that both short-skirt boards and straight triangular spoilers could reduce the snow accumulation and icing in the bogie area effectively
The relative particle concentration reduction ratio in A5 was more than 96%, and even exceeded 99% in the front bogie area of the front train. These results suggested that short-shirt boards and straight triangular spoilers could reduce the dust particle concentration in the bogie area and protect the highspeed train effectively (Supplementary Appendix SA4)

Summary

Introduction

When high-speed train runs in the environment with a large number of airborne particles such as dust (Tian, 2015; Wang et al, 2017) or snow (Vajda et al, 2014; Wu et al, 2019), these particles may enter the bogie area and affect the normal operation of the components inside the bogies. Azuma et al (2010) used the heater or air conditioner to heat the bogie end cover and bogie cover plate to effectively prevent the accumulation of snow particles, the durability of the heating wire and the layout of the exhaust pipe of air conditioning were difficult to be satisfied. Studies showed that antiicing coating on the key components of the bogie was very effective its cost was relatively high and life time was till short (Janjua et al, 2017)

Methods

Results

Conclusion