휠-레일 접촉 유래 비배기 미세먼지(미세 마모 입자)의 질량 농도 및 수 농도 특성 비교 분석

초록

"Urban railway tunnel air is heavily contaminated by non-exhaust particulate matter generated during train operation: particularly airborne wear particles originating from wheel-rail contact. In this study, the generation characteristics of airborne wear particles from wheel-rail contact were investigated using a Twin-disk rig, and the resulting particles were analyzed in terms of number concentration (NC) and mass concentration (MC). The results show that ultrafine (Dp ≤ 100 nm) and fine (100 < Dp ≤ 1000 nm) particles accounted for approximately 90% of the total NC, with fine particles contributing about 64%, representing the highest proportion. The NC exhibited a multimodal distribution, with the maximum peak occurring at approximately 190 nm. In contrast, coarse particles (1000 < Dp ≤ 10000 nm) dominated the MC, accounting for about 93%, which reflects the cubic dependence of mass on particle diameter. The MC distribution showed a bimodal pattern, with the maximum peak at around 2100 nm. These findings indicate that NC and MC exhibit distinct characteristics, and selecting the appropriate metric based on the research objective is essential."

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