Study on the effect of air supply intensity of the helmet on human respiration micro-environment
To improve the respiratory micro-environment of workers and reduce the risk of human occupational exposure,the temperature field,velocity field,and concentration field of the respiratory micro-environment of air-supplied helmet wearers were studied.A test platform was set up.The temperature,velocity,and dust concentration of the human respiratory micro-environment under different air supply intensities of the helmet were tested by employing the dummy test.The temperature distribution and velocity distribution of the human respiratory micro-environment were studied.The influence of the air supply intensity of the helmet on the total dust and respirable dust in the human respiratory micro-environment was clarified.The PS model was introduced to predict the wearer's satisfaction under different air supply intensities of the helmet.The results show that the cooling effect of the human respiratory micro-environment decreases along the X-axis direction,and the vertical cooling effect decreases along the Z-axis direction.The cooling effect of the middle part of the human face is better than that of the sides of the cheeks.The cooling effect is more obvious at the measuring point of the human nose.The velocity distributions of the human respiratory micro-environment under different air supply intensities of the helmet are consistent.The airflow range of the human respiratory micro-environment affected by the air-supplied helmet expands with air supply intensity.When the air supply intensity of the helmet is grade Ⅳ,the dust reduction efficiency in the human respiratory micro-environment is the highest,and the wearer's satisfaction rate is the best.The dust reduction efficiency of total dust and respirable dust in the human respiratory micro-environment reaches 81.39％and 82.89％,respectively.The results of this study provide a reference for improving the human respiratory micro-environment.
safety and hygiene engineering technologyhelmetair supply intensitydummy testrespiratory micro-environment
万方数据
维普
