Flow Field Analysis And Structure Optimization In The Tobacco Chamber Of Bulk Curing-barn

China is the country with the largest area for growing flue-cured tobacco,and the tobacco-roasting house,as the main equipment in the process of tobacco-curing,can largely determine the quality of tobacco-curing.Due to the limitation of its own structure,the existing tobacco leaf dense roasting room often has uneven air distribution during actual work,which will make the quality of the tobacco leaves in different areas different after baking,resulting in a decrease in the overall baking efficiency.This paper studies the airflow distribution and structure of the grill,which has engineering and theoretical significance.In this paper,the CFD software is used as a research tool,and the optimization scheme of the grill structure is determined by means of simulation.Firstly,the theoretical analysis of the drying characteristics of tobacco leaves is carried out.ANSYS FLUENT is used to simulate the flow field inside the smoking chamber,and the problems of air flow organization are analyzed according to the calculation results.Secondly,four factors including the size of the air outlet,the top slope,the built-in uniform air duct and the inclined angle of the guide plate were optimized,and the optimal values of each parameter were determined by comparison.Finally,the model parameters of tobacco leaf layer as porous medium were calculated by the formula,and the internal flow field of tobacco leaf room with full load was simulated on the basis of structural optimization.By analyzing the pressure field,temperature field and velocity field of the simulation results,the optimized structure of the curing barn is determined,which provides a reference for the future construction of the bulk curing-barn.