In glaze ice conditions, beads on the surface usually grow to form roughness elements through coalescence, finally resulting in enhancement of local collection efficiency. However, the effects of roughness elements due to freezing of beads are not reflected on the local collection efficiency in CFD icing simulations. This is problematic for predicting the resultant ice shape, which may lead to inaccurate aerodynamic performance and load distribution. The aim of this study is to propose a macroscopic icing model which can reflect bead microscopic phenomena using the Eulerian approach. To this end, a correction was made for collection efficiency by introducing a novel parameter - the effective impinging angle- which is the angle to calculate the local collection efficiency depending on the physical state of surface. It is assumed that the parameter related to the contact angle represents the state of beads. The computational icing analysis of airfoil was performed using the proposed model both in the rime condition and glaze conditions. The results show that the icing characteristics in the feather region is captured with enhanced accuracy in both conditions.

在釉冰条件下，表面上的珠子通常会通过聚结生长以形成粗糙的元素，最终导致局部收集效率的提高。但是，在CFD结冰模拟中，由于珠子冻结而引起的粗糙度元素的影响并未反映在局部收集效率上。这对于预测最终的冰形状是有问题的，这可能导致不正确的空气动力性能和载荷分布。这项研究的目的是提出一种宏观的结冰模型，该模型可以使用欧拉方法反映微珠的微观现象。为此，通过引入一个新参数-有效撞击角度-对收集效率进行了校正，该参数是根据表面的物理状态计算局部收集效率的角度。假定与接触角有关的参数代表珠的状态。翼型的计算结冰分析是在边缘条件和釉面条件下使用所提出的模型进行的。结果表明，在两种情况下，羽毛区域的结冰特性均得到了增强的准确性。