Raw data of particles accumulation in wind tunnel lab on the bogie of high-speed train in different cases
When high-speed train runs in environment with a large number of airborne particles which may accumulate on the bogie of the train, the normal operation of the bogie will be affected to reduce the riding comfort and train safety. The protective devices around the bogie were normally considered as an efficiency opinion to reduce the entry of particles into the bogie area. However, at present, there are relatively few analyses on the protective effects of diverse protective measures against different types of particles. In order to test the protective effects of shirt boards and spoilers, the airborne particle transport processes around the bogie were simulated in wind tunnel Lab. Three kinds of typical particles, including artificial snow particle, wheat bran, sieved soil, were employed to represent the different statuses of airborne particles in real conditions. Three parameters, including the relative reduction ratio (for 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 taken as the indexes to assess the protective effects.
Steps to reproduce
1. Train model layout. The simulated ground and train models and related experimental equipment were arranged in the wind tunnel. 2. Wind field test. A pitot tube was used to measure the wind speed at the upwind cross section (z∈[223, 518] mm & y∈[-160, 160] mm ) with a distance (in x direction) 500mm away from the train head. 3. Measuring the artificial snow accumulation. When the outdoor temperature was below -6 ℃, the moveable snowmaker worked to make snow particles which were supplied into wind tunnel and used to simulate wind blowing and snow conditions. The duration of this accumulation test was 5 minutes. After each measurement, the bogie was removed. And its mass change was measured on a balance before and after the experiment. The increase of weight was the amount of accumulated snow. The A1-A5 cases were tested separately, and the average accumulated snow mass on the six bogies (G-L) under each case was measured. 4. Comparative test on particle flux of fine wheat bran. Fine wheat bran was added from the feeding port. Probes of SPC were located at F and G positions along the center line of the train, respectively. Probe A was located at the reference position F to measure the horizontal flux of incoming particles. Probe B was located under the bogie G of the front train at the middle position to measure the horizontal flux of particles around bogie G. The measuring time was 5 minutes, each feed was about 4 kg, tests on the A1-A5 cases were performed, and each experiment was repeated. 5. Test on fine and sieved soil concentration. Through a feeding tube at the feeding port (openings on both ends of wind flow), fine and sieved soil dust particles was sent into the wind tunnel. The Grimm probe C at the reference position F was installed to measure the concentration of incoming particles. The Grimm probe D was put behind the middle of the bottom on the train bogie G to measure the dust concentration in the region of bogie G. The Grimm probe E was put behind the center of the truck of the bogie L to measure the particle concentration around bogie L. The testing time for each group was 5 minutes and A1-A5 cases were tested separately. 6. Data processing and analysis. Through the analysis on the experiment data, results on the average snow mass of the bogies in A1-A5 cases, the horizontal flux of fine wheat bran and the soil concentration of the fine-and-sieved soil, were summarized to evaluate the snow-protecting effects of the tested protective components.