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提出了一种新的吹吸气流的组合方式，并建立这种吹吸式排风罩流场的数学模型，通过数值解法求解，得出了流场的流线图和等速度线图，且用实验结果对数值解加以了验证。
A new combination of blowing and suction flow is proposed and a mathematical model of the flow field of the blowing and blowing hood is established. By numerical solution, the flow pattern and the isokinetic plot of the flow field are obtained. The experimental results were used to verify the numerical solution.