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Experiment determining pressure loss reduction using a shaped round exhaust hood

机译：使用形状圆形排气罩确定压力损失的实验

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In this study, we experimentally determined the local drag coefficient (LDC) of a round exhaust hood that was improved with different shaped inlet sections along the boundaries of the vortex zones occurring in the flow at the inlet of an exhaust hood. The LDC measurements were performed using two methods. The first method used a micromanometer and pneumometric tube to determine the LDC with and without considering frictional losses. Meanwhile, the second method determined the LDCs using the pressure and velocity distributions in the boundary layer with specially designed pressure miniprobes. The experimental and numerical results show that it is possible to achieve a drag reduction of more than 90% by shaping the inlet edges of the exhaust hood. This increases the range of contaminant capture, reduces noise, and prevents contaminants from escaping from the exhaust hood by eliminating the vortex zones and reducing the fan power.
机译：在这项研究中，我们通过在排气罩的入口处的流动中发生在流动中发生的涡旋区的边界，通过实验确定圆形排气罩的局部阻力系数（LDC），所述圆排气罩的圆形排气罩改善，所述入口部分改善了不同的形状的入口部分。使用两种方法进行LDC测量。第一种方法使用了微距计和气动管以确定LDC，而不考虑摩擦损失。同时，第二种方法利用边界层中的压力和速度分布确定具有专门设计的压力微型桥的LDC。实验性和数值结果表明，通过成形排气罩的入口边缘，可以实现超过90％的减小。这增加了污染物捕获的范围，降低了噪音，防止污染物通过消除涡旋区域并减少风扇功率来逸出排气罩。

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