Simulation And Optimization Of Air Distribution In Vehicle Drying Room Of Washing And Decontamination Center

With the outbreak of African swine fever in China,people engaged in the swine industry are more aware of the importance of the construction and management of vehicle decontamination centers.The standardized cleaning,disinfection and drying of vehicles can effectively reduce the risk of infection caused by foreign vehicles and cross infection in breeding areas.In order to improve the drying quality of the drying room in the decontamination center and effectively ensure the uniformity of the indoor temperature field,the airflow organization in the drying room must be optimized.The research object of this paper is the vehicle drying room of the decontamination center jointly developed by Zhengzhou university and Zhengzhou Lizhitian agricultural science and technology coporation,the causes of uneven indoor temperature field and low speed on both sides of the vehicle body caused by drying the feed truck in the drying room are studied and analyzed,and the drying process of the drying room is numerically simulated by using Airpak software.The indoor air distribution is optimized mainly from the following four aspects: the distance and height of rear fans,the speed of ground air supply outlets,the position of air return outlets and the height of side air supply outlets.And the influence of the thickness of insulation materials on the indoor temperature is simulated and analyzed.The following research contents and results are obtained:1.Field measurement was carried out on the vehicle drying room of the decontamination center,and the temperature rise curve during the operation of the drying room was analyzed.It is found that the temperature rises rapidly in the first 5minutes since the drying room is in operation,and the temperature field tends to stabilize in the next 20 minutes.However,the air supply flow of the rear fans are blocked by the vehicle body,and part of the air flow sent out by the fans only circulates at the rear of the drying room,leading to a low flow rate of the air flow at the front of the drying room.2.By optimizing the flow field through the position of the rear fans in the dryingroom.The position of the rear fans in the drying room play an important role in the airflow direction inside the drying room.In this paper,the distance between rear fans and the height of fans are simulated and analyzed.It is found that when the distance between fans is 2.5m and the height of upper and lower exhaust fans is 3.8m and2.7m respectively,the indoor temperature nonuniformity coefficient and velocity nonuniformity coefficient are the smallest.3.The temperature around the tire is reduced by optimizing the wind speed at the ground air outlet.Taking the average maximum temperature of the measuring points around the tire,it can be obtained that when the ground air outlet wind speed is6.9m/s,the optimized average temperature around the tire decreases from 97.84?before optimization to 91.35?,which is about 6.49?.4.The indoor air distribution is optimized by optimizing the position of the air return port.When the position of the air return port is set to be 0.5m from the outlet of the drying room,it has little influence on the air flow of the air supply port on the side wall,and meets the requirement that the distance between the air supply port and the air return port is greater than 1.5m.After optimization,the average temperature is increased by 0.83?.5.The influence of the height of the side air supply outlet on the indoor temperature field is studied.It is found that when the height of the side air supply outlet is 0.45 m,it has little influence on the air flow of the ground air supply outlet and the temperature nonuniformity coefficient at the measuring point is the smallest.6.After comprehensive analysis,the optimal scheme is showed.The optimized drying room temperature is basically between 70? and 75?,which can meet the drying requirements.The uniformity of temperature field and velocity field is improved,and the energy consumption is saved by 9.62% before optimization.7.The influence of wall insulation material thickness on indoor temperature was studied.