A Study on the Pressure Drop Characteristics of a Passive Filter System for Collecting Fine Brake Dust

摘要

Recently, the fine dust produced by automobile non-exhaust systems has drastically increased. Brakes are a major source of fine dust, along with tires. Therefore, this study investigated the pressure drop characteristics of a filter for collecting fine brake dust using only disk rotational flow without a fan or pump. In addition, the effect of the gap between the filter and the disc on the particle behavior and the pressure change inside the filter housing was investigated. Finally, the change in collection efficiency according to filter pressure drop characteristics was examined in a particle collection experiment. As a result, it was found that the build-up in pressure inside the filter housing from the disk rotational flow was insufficient. This meant the brake filter requires a pressure drop as low as possible, as in Filter 1. The pressure drop performance of these filters had a profound effect on the leakage of particles through the housing gap, and the rate of particle concentration reduction inside the housing. Lastly, it was found that to increase particle collection efficiency, it is important to control the particles that rotate in close contact with the disc, which escape through the rear end gap.