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通过建立上部排风式变风量型通风柜物理模型及CFD方法模拟,研究了柜门开度对通风柜柜内气流流动情况和压强分布情况的影响。结果表明,在柜门开度减少过程中,柜内压强分布较均匀,压强逐渐减小,气流流动逐渐紊乱,涡流区不断增多并扩大。通过增加柜顶的凹形弧度、增加导流板,可以在一定程度上减少柜门开闭过程中涡流的产生,更利于气体排出。
Through the establishment of the physical model of the upper exhaust air duct and the CFD simulation, the influence of the hatch opening on the air flow and pressure distribution in the air duct is studied. The results show that during the reduction of the opening of the door, the distribution of pressure in the cabinet is more uniform, the pressure is gradually reduced, the flow of air is gradually disrupted, and the swirl zone is continuously enlarged and enlarged. By increasing the concave arc at the top of the cabinet and increasing the deflector, eddy currents can be reduced during opening and closing of the cabinet door to a certain degree, which is more conducive to the gas discharge.