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暖通空调杂志社>期刊目次>2018年>第8期

基于大涡模拟的人体呼出气溶胶颗粒运动规律研究

Motion law of exhaled aerosol particle based on numerical simulation of large eddy model

冯国会[1] 毕 扬[1] 张亿先[2] 蔡易霖[1]
[1]沈阳建筑大学 [2]重庆大学

摘要:

考虑了不同呼吸模式(持续呼气与间歇呼吸)和不同通风情况(通风与无通风),运用大涡模型对坐姿女性人体鼻呼吸产生的气溶胶颗粒的运动规律进行了数值模拟,对比分析了不同工况下的热羽流、呼吸域流场及气溶胶颗粒扩散特性。结果表明:无通风情况下的持续呼气模式与间歇呼吸模式呼出的气溶胶颗粒运动规律很接近;通风情况下间歇呼吸模式呼出的气溶胶颗粒的扩散距离更远,持续呼气模式呼出的气溶胶颗粒的最大浓度更高,而间歇呼吸模式下的吸气过程会回吸总量7%~11%的气溶胶颗粒;在扩散一定时间后,通风增大了气溶胶颗粒的最大传播直线距离,但是短时间内气溶胶颗粒的排除量能达到25%以上。

关键词:大涡模拟,鼻呼吸,气溶胶颗粒,持续呼气,间歇呼吸,通风,运动规律

Abstract:

Numerically simulates the aerosol particle diffusion produced by nasal breathing of seated women, considering different breathing patterns (continuous exhaling and intermittent breathing) and different ventilation conditions (ventilation and without ventilation). Compares and analyses the thermal plume, respiratory flow field and aerosol particle diffusion characteristics in different conditions. The results show that without ventilation, the motion laws of the aerosol particles of continuous exhaling is closed to that of intermittent breathing, but in the ventilation condition, the diffusion distance of the aerosol particles of intermittent breathing is longer, the maximum concentration of the aerosol particles of continuous exhaling is higher and the inhalation process in intermittent breathing mode sucks 7% to 11% of the total amount of aerosol particles. After a certain time of diffusion, the ventilation extends the maximum linear distance of the aerosol particles, but the aerosol particles can be removed by more than 25% in a short time.

Keywords:largeeddysimulation,nasalbreathing,aerosolparticle,continuousexhaling,intermittentbreathing,ventilation,motionlaw

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