| In the process of textile production,the setting machine is the key equipment in the post-treatment heat setting process.Aiming at the problems of warp and weft skew and unstable fabric structure in the process of textile pre-treatment,the wet fabric is dried and shaped through the high-speed hot air jet from the nozzle to eliminate the wrinkles on the fabric surface,so that the fabric can obtain stable size and color.The air duct structure in the drying room of the setting machine directly determines the uniformity of the temperature field on the fabric surface.Therefore,it is necessary to analyze the air duct structure to ensure that the fabric is subjected to the uniform air flow of each nozzle in the drying and setting process.At present,when designing the air duct structure,many domestic setting machine manufacturers basically rely on their own experience,and lack of theoretical analysis of the air duct structure.It leads to uneven distribution of flow field in the air duct structure,uneven distribution of air flow in each nozzle and unstable direction of jet air,resulting in mildew of the fabric due to uneven drying.In this paper,the air duct structure in the drying room of the double-layer shaper is taken as the research object,and the modeling and simulation are carried out to analyze the influence of the air duct structure on the uniformity of the flow field and the phenomenon of uneven flow field.The air duct structure is optimized based on the simulation results.The research contents and conclusions of this paper are as follows:(1)This paper introduces the structural principle,working process,and existing types of the air duct of the double-layer setting machine,and introduces the theoretical basic knowledge involved in the performance analysis of the air duct of the double-layer setting machine,mainly including aerodynamics theory,hydrodynamics theory,and heat transfer theory.Combined with this theoretical knowledge,the performance characteristics of air ducts are analyzed.(2)Establish the three-dimensional model of the traditional air duct in the double-layer shaping machine,simplify the model and set relevant parameters,conduct the finite element analysis in FLUENT,through the simulation results,the influence of each structure on the uniformity of the flow field in the duct is analyzed,and the relevant conclusions are obtained.The inlet length and inclination angle of the air duct have little influence on the uniformity of the flow field in the air duct,and the installation of guide plate in the duct has a great influence on the flow field uniformity in the duct,which can effectively improve the flow field distribution in the duct.Installing baffle at the inlet of air duct nozzle can effectively change the air flow direction at each nozzle.According to the analysis of the optimization results,the optimal parameters of the air duct structure are obtained.(3)After the optimization analysis of the air duct structure,the structure of the nozzle is simulated and analyzed.Firstly,the influence of nozzle layout on fabric drying is analyzed.The simulation results show that when the nozzle is staggered for a certain distance on the air duct,there can be a better temperature distribution on the fabric surface;Secondly,the distance between the nozzle and the fabric was analyzed to obtain the optimal distance between the fabric and the nozzle in the drying process of the fabric.Finally,the nozzle height and the inclination angle of the nozzle side wall are analyzed to obtain the optimal parameters of the nozzle structure,so that the nozzle jet flow can blow vertically to the fabric. |
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