Simulated Experimental Study On Air Distribution And Particulate Matter Distribution Under Different Indoor Air Supply Modes

With the development of economy and the continuous improvement of science and technology,the living standards of human beings have also risen,and people pay more attention to the quality of life material consumption.The air-conditioning system brings people a comfortable indoor environment,and also has the effect of ventilation and decontamination,bringing a healthy and comfortable space for people to work and live.On the basis of energy conservation and health,we conduct research on air conditioning systems through experiments and simulations,in order to put forward new ideas and methods,and make efforts for the healthy development of people.In this paper,different air distribution forms and their evaluation indexes are first introduced,the experimental system and measurement system used in this study are described in detail,the simulation software Fluent and the physical model used in simulation are also introduced,the RNG k-? model and wall function method are used as turbulence models of indoor air flow.The experiments of double side-supply up-return and double top-supply up-return were carried out respectively in this paper.The airflow organization changes in the room were studied by changing the position of the return air inlet and the frequency of different fans.The indoor velocity field and temperature field under each experimental condition were measured respectively,and the data were collated and analyzed.The research shows that for the experiment of changing the position of the tuyere,the velocity field and temperature field of the air supply jet near the face wall and the air outlet position have some changes,but the other positions have no influence.After changing the fan frequency,the indoor velocity field and temperature field have obvious changes,but the air distribution is basically unchanged.Through modeling and meshing,the assumptions of boundary conditions use in the calculation meet the experimental requirements as far as possible.Fluent simulation software is used for calculation.The results of the experiment and simulation are analyzed and compared to find out the errors in the experiment and verify the reliability of the model.The model was used to study the diffusion of indoor particulate matter under different air supply modes when there is a baffle in the room.By comparing the particle size and the different positions of the particle generating source,the ventilation efficiency and energy utilization coefficient under different working conditions were calculated.In order to comprehensively evaluate the difference of different air distribution forms in improving indoor air quality.The research shows that the existence of baffle affects the airflow of side air supply,so that the indoor particulate matter is not easily discharged.Since the top air supply position is in the same section as the baffle,the top air supply is less affected.When the diameter of particulate matter is increased,the large particulate matter is obviously inert under the influence of gravity,and it is not easy for particulate matter to be discharged from the room.When the position of particulate matter release source is reduced,the effect of side air supply is not obvious,but the change of top air supply is large.