| The environment of low pressure and low oxygen in high altitude area seriously affects human physiological function,health and life safety.In order to create an oxygen-rich environment in the working space and reduce the negative impact of low-oxygen environment on human body by means of diffusion oxygen supply,the spatial and temporal distribution characteristics of indoor oxygen concentration under different air supply modes were analyzed by theoretical research and numerical simulation,which provided guidance for the strategy of dispersive oxygen supply in high altitude area.The main research contents and conclusions are as follows:(1)Based on the theoretical analysis of gas diffusion law,the simplified derivation equation of indoor oxygen partial pressure is obtained.In this paper,the solution method of indoor oxygen concentration distribution under unsteady conditions was analyzed theoretically,and the oxygen transfer process was analyzed,and the simplified equation of indoor oxygen partial pressure was obtained.In addition,the specific factors affecting indoor oxygen concentration distribution under the mode of continuous oxygen enrichment are systematically analyzed,which lays a theoretical foundation for the subsequent analysis and research.(2)Airpak software was used for transient simulation,and the temporal and spatial variation of indoor oxygen concentration under different air supply modes was obtained.Under the influence of air distribution,the oxygen distribution in the breathing zone of the working space with continuous oxygen enrichment was significantly different.With the passage of time,oxygen gradually diffused into the room,and the diffusion rate showed a decreasing trend.The oxygen enrichment effect was evaluated by selecting oxygen enrichment rate,oxygen concentration distribution index and blowing sensation index.The results showed that the oxygen concentration distribution was the most uniform when the air was supplied in the middle and lower return mode,and the oxygen enrichment rate was the highest when the air was supplied in the opposite side.(3)Comparative analysis of the influence of changing air supply mode on oxygen enrichment effect,the optimal planning scheme of different dispersion oxygen supply mode is obtained.When indoor workers have a large range of activities and are scattered,it is suitable to use uniformly dispersed circular air supply;The oxygen demand of personnel in different postures can be simultaneously satisfied by using middle and lower return mode.The air supply mode of up and down from the opposite side is adopted,which is suitable for the working places where the indoor personnel are mainly in the standing position.The air supply mode is more suitable for the workplace where the personnel are mainly sitting.(4)The influence of room size change on oxygen concentration distribution characteristics of different air supply modes was discussed,and the diffusion oxygen supply strategy was proposed combined with architectural factors.For different air supply modes,increasing the width of the room along the jet direction will have different effects on the uniformity of oxygen distribution.Among them,the oxygen distribution uniformity is most affected by the air supply mode of up and back,and the stability of oxygen enrichment is poor. |
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