基于热电转换与热催化氧化的新型动力空气净化头盔设计与性能分析

Abstract As urban air pollution worsens, cyclists are exposed to harmful substances such as volatile organic compounds (VOCs) and nitrogen oxides (NO x ), which affect their respiratory health. Meantime, the urban traffic environment presents numerous safety hazards, posing significant risks to cyclists. To address these issues, this paper proposes a novel power-air-purification helmet based on thermoelectric conversion and thermal catalytic oxidation. Firstly, computational fluid dynamics (CFD) simulations were conducted to analyze the effect of inlet curvature on internal flow velocity and outlet wind speed. As the inlet curvature changes from 15° to 60°, with an inlet wind speed of 60 km/h, the average outlet speeds are 59.4 km/h, 57.2 km/h, 60.5 km/h, and 53.3 km/h, respectively. Secondly, the impact of inlet temperature and speed on the helmet’s thermal purification performance was investigated. As inlet temperature increases from 5 °C to 30 °C, the single-pass ratio increases from 22.1 % to 29.7 %, clean air delivery (CADR) increases from 69.2 m 3 /h to 89.2 m 3 /h, while conversion efficiency drops from 0.78 % to 0.14 %. When wind speed rises from 5 km/h to 30 km/h, conversion efficiency increases from 0.39 % to 0.45 %, and power density increases from 4.66 W/m 2 to 7.73 W/m 2 . Finally, a thermoelectric purification model was developed, showing that the optimal curvature for thermoelectric efficiency is 45°. At −5°C, conversion efficiency increases from 1.04 % to 1.12 %, and power density rises from 226.9 W/m 2 to 329.2 W/m 2 . With increasing wind speed, the single-pass ratio decreases, but CADR increases, reaching 139.2 m 3 /h at 60 km/h, meeting the demand required by cyclists.