Optimization Design And Experimental Study On Air Supply Cylinder For Welding Workshop Displacement Ventilation

The main work in this paper is to optimization the air cylinder characteristicparameters and simulate displacement ventilation effect of the welding workshop.Terminal of air supply system have a significant effect on interior airflow distributionand temperature field. Through the optimization of supply air terminal is an importantmeans to improving indoor air distribution. In our country, the technology thatair-supply cylinder as the terminal of displacement ventilation depended on theintroducted technology, so it cost is higher, it has become a constrainted reason that thedevelopment of displacement ventilation application in the welding workshop. So byresearching new air-supply cylinder to improve the ventilation effect and reduce theproject cost has a positive significance.In this paper, based on the outlet velocity and the air cylinder interior velocityattenuation, CFD method was used to research optimization design for air supplycylinder. Taking a certain type of air supply cylinder as an example, study thecharacteristics parameters effect on the outlet velocity and the air cylinder interiorvelocity attenuation, such as internal structure, effective area and the wind hole shape.Firstly simulates the ventilated conditions air supply cylinder before and after changethe internal structure of the outlet velocity and internal speed attenuation, found thatafter change the internal structure,outlet velocity distribution is ideal and uniform.Secondly simulation analysis was carried out on the influence of effective area, foundthat decrease the effective area,not only can slow down the speed of cylinder internalattenuation,also make outlet velocity evenly in a reasonable range, while increase theeffective area although can also use the wind speed uniform but its value isunreasonable. Thirdly air cylinder the wind hole shape on the flow characteristics areanalyzed, found that changing the shap of the holes did not significantly effect theinternal attenuation and it can effectively improve oulet velocity although speed valuedistribution is unreasonable.Finally discuss the changes of several factors at once, foundthat change the internal structure and decrease the effective area at the same time caneffectively slow down the cylinder internal attenuation and outlet velocity.Field tests were conducted in a welding plant, due to the limitation of experimentalconditions, this article only tested under a condition of dust concentration, temperature,wind speed and other data, and comparing with simulated values, found that between simulation and experimental values has a certain deviation, but the overall trend is thesame, and gives the reasons of the deviation, so the Institute came to the conclusion thisarticle can guide the development of a new air supply cylinder to some extent.In addition,the air supply cylinder as ventilation terminal, displacement ventilationventilation effect of the simulation analysis and evaluation. Found that the optimized aircylinder for displacement ventilation when at the end of the ventilation and dustremoval effect works better.