Abstract: The anti-dirt performances of the plain tube and the enhanced tube with helical blade rotors were numerically studied using FLUENT software, and the axial and radial particle volume fraction distributions of the tube were also obtained. Meanwhile，the effects of the particle diameter on the anti-dirt performance of the enhanced tube were investigated. The numerical results indicated that the dirt in the enhanced tube with helical blade rotors decreased significantly compared with the plain tube，and the particle volume fraction at the bottom of the enhanced tube was higher than that at the top of the enhanced tube due to the gravity effect of the particle. As the particle diameter increased, the axial particle volume fraction at the bottom of the enhanced tube increased accordingly, and the axial particle volume fraction at the top of the enhanced tube decreased. In the radial direction of the enhanced tube, the effects of the particle diameter on the particle volume fraction of the near-wall region were significant.

Key words: helical blade rotor, particle, dirt, diameter, numerical simulation

摘要： 采用流场分析软件FLUENT模拟研究了光管及内置螺旋叶片转子强化管的抗污垢性能，得到了换热管轴向以及径向颗粒污垢体积分数分布，并研究了颗粒直径对强化管抗污垢性能的影响。研究结果表明，与相同条件下的光管相比，强化管管内沉积的污垢明显减少，并且由于颗粒自身重力影响，换热管底部沉积的污垢体积分数高于换热管顶部；此外，随着颗粒污垢直径的增大，轴向方向上强化管底部的颗粒污垢体积分数有所增加，强化管顶部的颗粒污垢体积分数有所减小；径向方向上颗粒直径对强化管近壁区域的颗粒污垢体积分数的影响最为明显。

关键词: 螺旋叶片转子, 颗粒, 污垢, 直径, 数值模拟