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Theoretical study of glaze ice accretion on an oscillating cylinder and its aerodynamic characteristics
Journal of Fluids and Structures ( IF 3.4 ) Pub Date : 2021-04-20 , DOI: 10.1016/j.jfluidstructs.2021.103231
Chao Zhou , Jiaqi Yin , Yibing Liu

Researchers, through time, have been conducted a series of theoretical and experimental measures on the glaze icing phenomena, but very few literatures can be found to quantify the effects of cylinder oscillation on the evolution of water films and ice shapes, and further to characterize aerodynamic characteristics during the glaze ice accretion process. A preliminary study is carried out to demonstrate a glaze icing process on the upwind face of both fixed and movable cylinder surfaces, and to discuss the cylinder aerodynamic characteristics. Based on the lubrication theory, the coupled masses and energy balances, the evolution of water film and glaze ice growth models on the upwind side of the cylinder are proposed by considering water film thickness, ice thickness, upper rivulet positions and the cylinder acceleration in the vertical direction. Wind pressures and frictions, and aerodynamic coefficients on the cylinders (Non-ice with rivulet, iced with rivulet and non-rivulet) are computed by the computational fluid dynamics (CFD) method. A comparison between the fixed and the moveable cylinders on water films and the ice shapes is carried out, and the effects of the upper rivulet positions and the wind velocities on aerodynamic vibrations of both iced and non-ice cylinders are also discussed further. The results show that the cylinder oscillation has a certain effect on the upper rivulet positions, and further influences on ice shapes. Moreover, the aerodynamic characteristics of the cylinders with upper rivulets are somewhat like wind velocities and amplitude-restricted vibrations. It turns out that the proposed models can capture main features of the glaze icing process, and shed light on more actual glaze ice accretion.



中文翻译:

摆缸上结冰的理论研究及其空气动力学特性

研究人员一直以来对釉面结冰现象进行了一系列的理论和实验措施,但很少有文献可以量化缸体振动对水​​膜和冰形演变的影响,并进一步表征空气动力学。釉冰积聚过程中的特性。进行了初步研究,以证明在固定和可移动气缸表面的迎风面上都进行了结冰过程,并讨论了气缸的空气动力学特性。基于润滑理论,结合水汽的厚度,冰层厚度,上部小流子位置和汽缸在汽缸中的加速度,提出了耦合质量和能量平衡,汽缸上风侧水膜和釉冰生长模型的演变。垂直方向。通过计算流体动力学(CFD)方法计算气缸上的风压和摩擦力以及空气动力学系数(带小河的非冰,带小河的冰和非小河的冰)。进行了固定和活动汽缸在水膜上和冰形状之间的比较,并且还进一步讨论了上小艇位置和风速对冰汽缸和非冰汽缸的空气动力振动的影响。结果表明,汽缸振动对上流角的位置有一定的影响,并进一步影响冰的形状。此外,带有上铆钉的气缸的空气动力学特性有点像风速和振幅受限的振动。事实证明,所提出的模型可以捕获釉面糖衣过程的主要特征,

更新日期:2021-04-20
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