Study On Measurement And Numerical Simulation Of Drying Room Of Livestock Truck

African swine fever and other epidemics to China’s animal husbandry caused a serious blow,the root cure of the plague is difficult,but can use characteristics that the most of the virus is not resistant to high temperature,effective epidemic prevention.The drying room of livestock truck has become a key link in the prevention and control of animal husbandry epidemic because it can dry the vehicles at high temperature.Its development and construction have received attention from top to bottom.In this paper,the latest generation of drying room of livestock truck as the research object,using the method of combining measurement and simulation,the speed field and temperature field in the drying room and the drying effect of the vehicle were analyzed,and the corresponding optimization design scheme was proposed.First,through the analysis of the drying mechanism of hot air in the drying room,the factors affecting the drying effect are summarized.Then the temperature of the car body,the temperature of each tuyere and the wind speed in the drying process of the drying room of livestock truck in the north of Henan in winter were continuously monitored.Through the analysis of the measured data,the rationality of the distribution of the velocity field and temperature field in the drying room and the drying effect of the vehicle were explored.After established with large livestock truck load conditions of three-dimensional steady-state model of drying room,and the simulation results is analyzed,finally,found on the above analysis in the process of drying room temperature distribution is not reasonable and local car body drying effect is poor problem,air distribution optimization and supply air parameters optimization scheme,in order to ensure the vehicle’s overall maintain at about 65℃temperature,drying effect support vehicles.By comparing the simulation results of various schemes,the best design and operation scheme of the drying room are determined.The main conclusions of this paper are as follows:(1)Factors influencing the drying effect in the drying room can be summarized into three aspects:drying room conditions,vehicle conditions and environmental conditions.Among them,the structure form of drying room,air distribution mode and air supply parameters have more significant effects on drying effect.(2)In the heating stage of the drying room,the highest temperature of the air outlet can reach 195.5℃,which is easy to cause local damage to the car body.The drying time of most measuring points of the compartment was only about 25min when the temperature was maintained above 60℃.The drying effect of the chassis and the front part of the vehicle was poor,among which the highest temperature of the temperature measuring point on the front part of the chassis was only 57.6℃.(3)The air volume of the rear fan in the initial model of the drying room is too large,and the airflow needs to be inhaled from all directions.Due to the small space in the drying room,the jet flow and backflow of the rear fan hinder each other,so that only a small part of the high-speed airflow blowing to the compartment reaches the front.In addition,when most of the airflow flows back along the wall,it meets the airflow from the side wall air supply outlet,which reduces the distance of hot air jet from the side wall air supply outlet.The airflow temperature difference between chassis and carriage is large,while the vertical temperature difference between railing and side wall is small.The temperature of more than 90%of the vehicle chassis is below 65℃,and the highest temperature is located behind the chassis,which can reach 91.3℃.However,the temperature at the front of the chassis is low,the lowest temperature is53.2℃,and the air temperature near the ground is only 40～50℃.The temperature distribution on the first floor was uneven,with the highest temperature reaching 82.4℃.(4)It can be known from the optimization results of air distribution and air supply parameters:when the rear fan quantity reduced to 2,the position of the vertical arrangement corresponding twolayer and three layer carriage plate,side walls out of air supply outlet of air flow in the depth direction,as far as covering the railings,all block each other between the jet and the circumfluence situation at least;When the side wall air supply outlet is disassembled into four,two are arranged in the original air supply outlet position and two are arranged in the middle of the car body,the problem of too low temperature in the front of the chassis and too high temperature in the rear hanging box is improved;By moving the return air outlet 2m forward,the problem of too low temperature and wind speed near the front of the car can be solved.The temperature in front of the car can be raised to between 70℃and 80℃,and the temperature distribution is more uniform.When a single row of 6 ground tuyere,the drying effect of chassis can meet the drying requirements,and the uniformity is good;The air supply parameters are set as the side wall air supply temperature 110℃,the air supply speed 20m/s,the circulating air volume of the ground air outlet 0.4m~3/s,and the circulating air volume of the rear fan 4m~3/s.The body surface temperature distribution is more uniform,the overall temperature range is 61.2～79.3℃,and the average temperature of the body is70.1℃.All parts of the body meet the drying requirements.