Fluid Analysis And Structure Optimization Of Parallel Flow Field In Corn Drying Section

China's northern region of high corn yields,accounting for more than 30% of the country's corn area,total production accounted for 40% of total output,it needs to be dried in time,in order to reduce the amount of loss,In the north,a vertical drying tower is widely used as a drying device to dry large-yield grains,and the downstream drying process has a fast drying speed,and is suitable for drying such high moisture grains of corn,and widely used in our province.In order to further improve the downstream drying efficiency and improve the drying uniformity on the basis of the current downstream drying process,the distribution of the drying medium in the drying chamber is studied,and the structure of drying section is optimized.However,the size of the drying apparatus is large and complicated,and the conventional method is difficult to measure and high in cost.Therefore,this paper combines the numerical simulation method with the traditional experimental test method,can intuitively understand the flow field distribution in the drying section.According to the research,firstly,through the determination of relevant parameters of corn,the parameters to be determined are the initial moisture content of corn,Average diameter,density,porosity,etc.The wind speed conditions of the dry numerical simulation were selected by combining the corn drying characteristic test and the ventilation resistance test.Finally,the wind speed condition of 0.75 m/s was determined to be most suitable for the numerical simulation of corn drying.The mathematical model of the flow field in the downstream drying tank was established by combining CFD(Computational Fluid Dynamicstheory)with actual experimental conditions.Secondly,the characteristic monitoring point combined with uniformity evaluation index is established in the drying chamber,and the internal flow field distribution when the wind speed is 0.75m/s is simulated.The results show that the wind speed at the steady state is almost zero at the wind speed away from the entrance.The air volume is mainly concentrated at the entrance and exit,and there is a blind space in the drying section.The tube is the main conveying structure for guiding hot air.By changing the angle of the windshield on both sides of the tube.The flow field state of the angular tube is analyzed under three angles.The simulation results show that the uniformity of the internal flow field is improved by changing the angle of the angular wind shield.When the inlet tube and the outlet tube windshield are both adjusted by 11°,the drying uniformity of Z=320mm in the middle of the drying box is the best,and its unevenness coefficient decreases from 20.6% to 7.34%.Finally,three different wind speeds of 0.5m/s,0.75m/s and 1m/s were used to test the wind field in three states.The test results show that the uniformity is achieved under different wind speed conditions.Therefore,the angle of the wind deflector needs to change with different boundary conditions,which can better improve the uniformity of the internal flow field distribution.The structure was optimized for the above research results.Based on computer numerical simulation,the intuitive internal flow field distribution broadens the design ideas and provides a substantial basis for structural optimization of drying equipment.