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首页> 外文期刊>International Journal of Heat and Mass Transfer >An experimental investigation on the dynamic ice accretion and unsteady heat transfer over an airfoil surface with embedded initial ice roughness
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An experimental investigation on the dynamic ice accretion and unsteady heat transfer over an airfoil surface with embedded initial ice roughness

机译：嵌入初始冰粗糙度的翼型表面动态积冰和非稳态传热的实验研究

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In the present study, a comprehensive experimental study was conducted to evaluate the effects of initial ice roughness formed around the leading-edge of an airfoil model on the dynamic ice accretion and unsteady heat transfer processes over the airfoil surface. The experimental study was performed in the Icing Research Tunnel at Iowa State University, Two airfoil models with the same airfoil shape were manufactured by using a rapid protype machine for a comparative study, i.e., one test model was designed to have embedded initial ice roughness around the airfoil leading-edge and the other model having smooth airfoil leading-edge as the comparison baseline. During the experiments, while a high-speed imaging system was used to record the early-stage icing morphologies over the airfoil surfaces with and without the initial leading-edge roughness, an infrared (IR) thermal imaging system was also utilized to map the corresponding surface temperature distributions over the airfoil surfaces to quantify the unsteady heat transfer and dynamic icing, i.e., phase changing, processes under different test conditions. It was found that, the initial ice roughness formed around the airfoil leading-edge would affect the characteristics of local airflow, impingement of supercooled water droplets, collection and transport of impacted water mass, unsteady heat transfer and subsequent ice accretion processes dramatically. The initial ice roughness formed around the airfoil leading-edge would redistribute the impacted water mass, with more impacted water mass being captured and frozen over the roughness region. In addition, the initial ice roughness was also found to produce span-wise-alternating low- and high-momentum pathways (LMPs and HMPs, respectively), which can significantly affect the convective heat transfer and subsequent ice accretion processes over the airfoil surface. (C) 2019 Elsevier Ltd. All rights reserved.
机译：在本研究中，进行了一项全面的实验研究，以评估翼型模型前沿周围形成的初始冰粗糙度对翼型表面动态积冰和不稳定传热过程的影响。实验研究是在爱荷华州立大学的结冰研究隧道中进行的，使用快速原型机制造了两个具有相同翼型形状的翼型模型进行比较研究，即，设计了一个测试模型来嵌入初始冰粗糙度机翼前缘和另一种以机翼前缘为平滑基准的模型。在实验过程中，虽然使用高速成像系统记录了有和没有初始前缘粗糙度的机翼表面的早期结冰形态，但也使用了红外（IR）热成像系统来绘制相应的图像。翼型表面上的表面温度分布，以量化在不同测试条件下的不稳定传热和动态结冰（即相变）过程。结果发现，机翼前缘周围形成的初始冰粗糙度将显着影响局部气流的特性，过冷水滴的撞击，受影响水团的收集和输送，不稳定的热传递以及随后的积冰过程。在翼型前缘周围形成的初始冰粗糙度将重新分配受影响的水量，而更多的受影响水量将被捕获并冻结在粗糙度区域上。此外，还发现初始的冰粗糙度会产生沿翼展方向交替的低动量路径和高动量路径（分别为LMP和HMP），这会显着影响对流传热和后续机翼表面上的积冰过程。 （C）2019 Elsevier Ltd.保留所有权利。

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