Abstract：

In order to study the airflow characteristics of human breathing microenvironment, reproduce the process of human inhalation exposure and obtain the actual exposure level of exhaled droplet or droplet nuclei in the respiratory tract, designs a new type of breathing thermal manikin. It is the first time to realize the combination of the breathing thermal manikin and the respiratory tract model. The shape of the manikin is similar to the average human body. By adjusting the output power of the heating system of the manikin, it can simulate the metabolic heat dissipation of the human body at different levels of activity. The “ideal respiratory tract” composed of the oropharyngeal model and Weibel level 0-4 respiratory tract model is embedded to restore the movement state of the inhaled airflow in the respiratory system and effectively measure the actual exposure dose of droplet nuclei in the respiratory tract. The breathing simulator is independently developed, which can output sinusoidal curve close to real human respiratory characteristics, and simulate the respiratory characteristics of human body in different activities by adjusting respiratory parameters. Measures the surface temperature and heat transfer coefficient of the manikin. The preliminary results show that the breathing thermal manikin can simulate the metabolism level and respiratory characteristics of human body in various active states, reproduce the human microenvironment under the combined action of human thermal plume and respiratory airflow, and can replace human to conduct scientific studies.