Human-walking-induced particle resuspension in indoor environments is believed to be an important source of particulate matter. Aerodynamic disturbance generated by the human foot during a gait cycle are the main driver for particle detachment and dispersion in the room. In this work, the hot-wire anemometry technique was employed to investigate the airflow generated by one phase of the human gait cycle: the foot tapping. This phase was simulated by a mechanical simulator that consists of a wooden rectangular 25 × 8 × 1.2 cm plate, and a servomotor that allows downward and upward rotations of the plate with a constant velocity. A correction procedure based on the hot-wire velocity measurements and the analytical solution of Falkner–Skan has been derived to correct the hot-wire readings in the near-wall region. Results show a sharp increase of airflow velocity in front of the simulator after the simulator rotation. Transverse hot-wire measurements downstream of the simulator show that the profile of the maximal velocities reaches a peak at a distance y = 8 × 10−3 m from the wall. The expulsed air from the volume under the simulator propagates downstream from the foot to reach near zero velocity values at 0.15 m away from the top of the simulator.

中文翻译：

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使用热线风速测量法对人脚敲击产生的气流进行实验研究

室内环境中人类步行引起的颗粒再悬浮被认为是颗粒物的重要来源。人脚在步态周期中产生的空气动力学扰动是粒子在房间内脱离和分散的主要驱动因素。在这项工作中，热线风速测量技术被用来研究人类步态周期的一个阶段产生的气流：足部敲击。该阶段由一个机械模拟器模拟，该模拟器由一块 25 × 8 × 1.2 厘米的木制矩形板和一个伺服电机组成，该伺服电机允许该板以恒定速度向下和向上旋转。已经推导出基于热线速度测量和 Falkner-Skan 解析解的校正程序，以校正近壁区域的热线读数。结果显示，模拟器旋转后，模拟器前方的气流速度急剧增加。模拟器下游的横向热线测量表明，最大速度的轮廓在距离墙壁 y = 8 × 10−3 m 处达到峰值。从模拟器下方体积排出的空气从脚部向下游传播，在距模拟器顶部 0.15 m 处达到接近零的速度值。