Experimental And Simulated Study Of Upper Air Supply Outlet For Push-Pull Ventilation

Along with the development of the industry in our country, the industry productionhas to implement much more effective control of the dust and harmful gas urgently.Apparently, this problem is still not resolved yet. Setting up parallel local flow windsuction ventilation system can effectively solve this problem. But in some cases,because of the limitation of industrial sites, the air supply outlet wind suction system isput forwarded. Since the wind suction ventilation system lacks system research and isstill in attempt stage. In order to use and promote this technology, this article will set theair supply outlet suction ventilation blowing device as the research object, with the aidof fluid mechanics, the jet flow theory and related theory. Means of model experimentcombined with numerical simulation will be applied to. The specific way to realize itwill be a systematic research of this system, from the overhead of air supply outletsuction ventilation system air flow field characteristics and influencing factors in thissystem under different air supply outlet angle and non-isothermal conditions of flowfield.First of all, the flow field test was carried on in this bench of air supply outlet windsuction ventilation system. We analyzed the flow field characteristic of the experimentsystem mainly from three aspects (the position of axis, axis velocity along the changerule and the critical section), and concluded the basic characteristics of the system.Secondly, based on the model test bench1:1ratio, outlet wind suction ventilationsystems on the flow field characteristics were analyzed from the aspects of velocityfield, pressure field and pollutant control of air supply. And this analysis was contrasted with experimental test. On this basis, using numerical simulation method ofcomparing the different angle of air supply outlet flow field characteristics, we foundout the best angle range and provided a reference for designers.Finally, combining the experimental measurement and numerical simulationmethod, under non-isothermal conditions, this system was analysed from thereaspects(the air supply outlet blow suction and ventilation systems in the velocity field,temperature field and capture efficiency) to find out whether it would change a lot.Some feasible suggestions would be came up with.Through the experimental analysis and numerical simulation, this paper draws thefollowing conclusion:(1) Under different horizontal distance of push and pull tuyere, upper air supplyoutlet for push-pull ventilation system integrated the highest rating and works best whenair supply outlet Angle of30°, and the rating of each operating mode is decreasedwith the increase of air supply outlet Angle of the trend.(2) When the horizontal distance of push and pull tuyere between3and4meters,itis better to choose air supply outlet Angle of30°and45°.(3) Due to the large control distance and low capture efficiency,when horizontaldistance of push and pull tuyere greater than5m,it is not recommended to use the upperair supply outlet for push-pull ventilation system.(4) For the indoor and outdoor temperature difference has a significant influenceon the flow field of upper air supply outlet for push-pull ventilation system,we canincrease the speed of push and pull tuyeer to improve it.