抛丸室内通风效果优化研究

Study on Optimization of Ventilation Effect in Blasting Chamber

传统抛丸室通风系统是利用通风系统负压作用,通过门缝和悬链通道渗透的空气参与颗粒物的捕集和输运,这种通风方式存在气流组织不可控、颗粒物捕集效果不佳的问题。采用数值模拟的方法分析了抛丸室内的气流组织特点,并提出了一种主动送风情况下的通风效果的评价方法。结果表明,在原设计风量时,通过加装双风口、送风射流入射角度为20°、排风口位于大门对侧壁面中心位置时的通风效果较好;铸件尺寸越小,颗粒物的捕集效果越好;在排风量降低20%的情况下,送风口尺寸为500 mm×500 mm时的颗粒物捕集效果最好。

Traditional blast room ventilation systems are involved in the capture and transport of particulate matter through the air penetrated through the door slits and suspension chain channels under the condition of negative pressure effect of the ventilation system, and this ventilation method suffers from uncontrollable air distribution and poor particle trapping effect. In this study, numerical simulation was used to analyze the airflow characteristics in the blasting chamber, and a method to evaluate the ventilation effect under an active air supply was proposed. The results showed that the ventilation effect was better at the original design air volume by adding double air outlets, with the air supply jet incidence angle of 20° and the exhaust air outlet located at the center of the wall on the opposite side of the door;the smaller the casting sizes, the better the particle trapping effect. The best particulate trapping effect was achieved at an exhaust air outlet size of 500mm × 500 mm with a 20% reduction in exhaust air volume.