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首页> 外文会议>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：用双绞线裂解炉管中的流体动力学性能：实验与仿真

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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：使用空气作为流体介质，水动力学实验结果表明，与圆管相比，管中的边界层变得薄，从而导致传热系数的增加。因此，增强了传热。管中央区域的轴向速度分布比圆管更平滑，而靠近墙面区域的速度毕业速度大。管中的压降增加，而压力分布甚至沿管轴沿着管轴线，同时在圆管中。模拟结果表明，切向速度快速增加，而流体流入双绞线，然后沿管轴逐渐减小，沿管直径逐渐增加，而流体从扭曲的切片流出。在管直径的方向上，存在轴向速度等于整个横截面的平均轴向速度的点。管中的整个压降和局部压降扭曲切片部分随着入口速度的增加而升高，并且与管直径无关。管中的平均电阻系数与Reynolds数（RE）具有线性关系，这随着RE的增加而减小。随着Re的增加和管直径的降低，扭曲切片截面局部电阻损失增强。扭曲比对管中的流场有影响，其最佳数字面积在研究中为2.4〜2.6。

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