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首页> 外文会议>2011 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring >Hydrodynamics Performances in Cracking Furnace Tube with Twisted Slice: Experiments and Simulations
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Hydrodynamics Performances in Cracking Furnace Tube with Twisted Slice: Experiments and Simulations

机译：扭曲切片裂化炉管内的流体动力学性能：实验和模拟

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Employing air as fluid media, hydrodynamics The experimental results showed that boundary layer in the tube became thin compared with circular tube, which leaded to the increase of heat transfer coefficient. So heat transfer was enhanced. Axial velocity distribution in central area of the tube was smoother than that of circular tube, while velocity grad in near wall area was greater. Pressure drop increased in the tube, whereas pressure distribution was even along tube axis, in agreement with that in circular tube. The simulated results showed that tangential velocity increased rapidly while fluid flowed into the twisted slice, and then decreased gradually along tube axis and augmented gradually along tube diameter while fluid flowed out from the twisted slice. In the direction of the tube diameter, there existed a point where axial velocity was equal to the average axial velocity of the whole cross section. The whole pressure drop in the tube and local pressure drop in twisted slice section both rose with the increase of inlet velocity, and were independent of the tube diameter. Average resistance coefficient in the tube had a linear relationship with Reynolds number (Re), which reduced with the increase of Re. Local resistance loss in twisted slice section enhanced with the increase of Re and the decrease of the tube diameter. Twist ratio had an influence on the flow field in the tube, whose optimal numeric area was 2.4~2.6 in the studies.
机译：利用空气作为流体介质，进行了流体动力学实验结果表明，与圆形管相比，管内边界层变薄，从而导致了传热系数的增加。因此，传热得到了增强。管中心区域的轴向速度分布比圆形管光滑，而近壁区域的轴向速度梯度则更大。管中的压降增加，而沿管轴的压力分布均匀，与圆形管中的一致。模拟结果表明，切向速度在流体流入扭曲片时迅速增加，然后沿管轴方向逐渐减小，在流体从扭曲片中流出时沿管直径逐渐增大。在管直径的方向上，存在一个点，其中轴向速度等于整个横截面的平均轴向速度。管内的整个压降和扭曲切片部分的局部压降都随着入口速度的增加而上升，并且与管的直径无关。管中的平均电阻系数与雷诺数（Re）呈线性关系，随Re的增加而减小。随着Re的增加和管径的减小，扭曲的切片截面的局部电阻损失增加。扭曲比对管内流场有影响，研究中其最佳数值范围为2.4〜2.6。

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