Structure Design And Optimization Of Air Inlet Of Textile Air Conditioning Based On CFD

Driven by the "One Belt One Road",the market economy of my country’s textile industry has developed rapidly,which has transformed from a traditional labor-intensive industry to a new type of technology,fashion,and green industry.With the continuous investment in automation equipment,production efficiency is remarkable.However,the rapid growth of production capacity leads to a substantial increase in energy consumption,which easily leads to the problem of unsustainable development.Therefore,in order to save energy and reduce consumption,textile workshops mostly adopt the method of large and small environmental air supply.Spinning and winding processes are the key to yarn quality assurance.Intelligent spinning machines,automatic winders,and fine-winding transmission systems are put into the textile production workshop,resulting in spinning and winding with different relative humidity requirements arranged in the same working area.If the respective process requirements cannot be achieved,it will have an important impact on product quality.Therefore,it is necessary to study the airflow distribution in the small environment air supply area of workshop equipped with spinning-winding unit.In this study,based on the CFD technology and related research,the Realizable k-ε turbulence model was adopted by comparing experimental values and the simulated values of different turbulence models under the same working condition.Numerical simulations of airflow distribution in workshop equipped with spinning-winding unit with different structural parameters of composite type mixed flow inlet were carried out.The optimal structure of the air outlet was determined,and applied to the workshop test to analyze its shortcomings.In view of the particularity of the environment requirements of the fine connection workshop,a kind of directional uniform flow inlet was proposed.The simulation results of composite type mixed flow inlet and directional uniform flow inlet applied to the same workshop were compared.The air supply effects of the two air supply outlets were experimentally studied,and their respective air distribution characteristics were analyzed.The velocity and temperature unevenness coefficient were used as indexes to evaluate their air supply effects.The air distribution of the directional uniform flow inlet applied in workshop equipped with spinning-winding unit with different connection modes was studied.The results show:(1)When the diameter of rectifying grid of composite type mixed flow inlet is30 mm,the distribution of velocity,temperature and relative humidity is more uniform than other working conditions,and it is more suitable for the process environment requirements.The optimal composite mixed flow inlet is applied to the workshop equipped with spinning-winding unit and its air distribution is tested.It is found that the average relative error between the simulation results and the test results is less than 10%,which shows that the numerical calculation model is reasonable.(2)There are still some deficiencies in the composite type mixed flow inlet.The air flow direction through the inlet can not directly reach the work area,and the composite type mixed flow inlet can not realize the air volume distribution under the small air supply environment,so it has certain limitations when it is applied to the workshop equipped with spinning-winding unit.Therefore,this study improves the composite mixed flow inlet and proposes a directional uniform flow inlet.(3)The air distribution of the directional uniform flow inlet is more uniform than that of the composite mixed flow inlet,and the temperature and humidity of each area generally meet the required environmental requirements,and the change interval is not large;The test results show that the average values of velocity unevenness coefficient of composite type mixed flow inlet and directional uniform flow inlet are0.2093 and 0.0889,respectively,and the average temperature unevenness coefficients are 0.0152 and 0.0083,respectively.The larger unevenness coefficient of the composite type mixed flow inlet is due to the phenomenon of some airflow converging after passing through the air supply outlet,resulting in the large difference of wind speed under the air supply outlet.However,the smaller unevenness coefficient of the directional uniform flow inlet is smaller because of the drainage design of the air flow direction in the structure,which avoids the above phenomenon,and the air volume adjustment in a small environment can be realized.(4)The numerical simulations of directional uniform flow inlet applied in small environment with different equipment layout are carried out,the results show that the air supply outlet can adjust the air volume by adjusting by adjusting the angle of the split blade,so as to realize the adjustment of the relative humidity to meet the process requirements.The current sharing guide plate can send air to the target area by rotating the guide plate,so as to realize the directional air supply to the equipment area.Therefore,the directional uniform flow inlet can be flexibly applied in engineering,and achieve a good air supply effect.