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<p>The slipstream flow generated by high-speed trains poses significant safety risks to passengers, platform users, and trackside personnel. This study investigates slipstream-induced aerodynamic loads using a novel 1/25-scale High-Speed Rotary Scaled Model (HRSM). Experiments were performed at lateral distances between 0.6 and 1.6&#xa0;m (full-scale equivalent) and heights of 1.5–3.0&#xa0;m above the rail, representative of human-exposure regions. Quadratic regression was applied to quantify the influence of train speed, and the HRSM results were validated through comparison with existing straight-path measurements.Peak positive pressures were observed near the nose region and decayed with increasing radial distance. Tangential pressure components were found to be consistently higher than radial components, with an average ratio of approximately <b>1.5:1</b>, resulting in stronger aerodynamic loading in the direction parallel to train motion. Using measured pressure distributions, the aerodynamic torque on the upper body was computed for both radial (perpendicular) and tangential (parallel) standing orientations. The results show that the <b>tangential orientation produces an overturning moment exceeding the person resisting moment up to approximately 1.4&#xa0;m from the train side</b>, whereas the radial orientation remains below the critical threshold across the entire measurement range. These findings confirm the HRSM as a robust methodology for high-fidelity slipstream assessment and provide safety-relevant insights into human stability near high-speed train operations.</p>

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A Comprehensive Study of Slipstream Flow and Pressure Variation in Trackside Safety Allowable Distances Using High-Speed Rotary Scaled Model (HRSM)

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • S. Yousefi,
  • M. R. Talaee,
  • S. M. E. Ghafelehbashi

摘要

The slipstream flow generated by high-speed trains poses significant safety risks to passengers, platform users, and trackside personnel. This study investigates slipstream-induced aerodynamic loads using a novel 1/25-scale High-Speed Rotary Scaled Model (HRSM). Experiments were performed at lateral distances between 0.6 and 1.6 m (full-scale equivalent) and heights of 1.5–3.0 m above the rail, representative of human-exposure regions. Quadratic regression was applied to quantify the influence of train speed, and the HRSM results were validated through comparison with existing straight-path measurements.Peak positive pressures were observed near the nose region and decayed with increasing radial distance. Tangential pressure components were found to be consistently higher than radial components, with an average ratio of approximately 1.5:1, resulting in stronger aerodynamic loading in the direction parallel to train motion. Using measured pressure distributions, the aerodynamic torque on the upper body was computed for both radial (perpendicular) and tangential (parallel) standing orientations. The results show that the tangential orientation produces an overturning moment exceeding the person resisting moment up to approximately 1.4 m from the train side, whereas the radial orientation remains below the critical threshold across the entire measurement range. These findings confirm the HRSM as a robust methodology for high-fidelity slipstream assessment and provide safety-relevant insights into human stability near high-speed train operations.