Effects of the gap ratio on the flow field structures and the aerodynamic performance of an airfoil with ridge ice

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL Experimental Thermal and Fluid Science Pub Date : 2024-06-18 DOI:10.1016/j.expthermflusci.2024.111256
Chengyi Zheng , Zheyan Jin , Zhigang Yang , Lei Yu
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Abstract

Under SLD icing conditions, the ridge ice may appear on the surface of aircraft, which led to the significant aerodynamic deterioration and affected aircraft flight safety. The present study experimentally investigated the effects of the gap ratio on the flow field structures and aerodynamic performance of an airfoil with ridge ice. Detailed measurements were performed in a low-speed reflux wind tunnel by utilizing the Particle Image Velocimetry (PIV) technique and a high-sensitivity six-component balance. The results showed that the maximum lift coefficient, stall angle, and maximum pitch moment coefficient of the airfoil increased as the gap ratio enlarged. At AOA = 10 deg, the separation bubble length decreased by 77 % when the gap ratio changed from 0 to 0.1. Meanwhile, the separation bubble length decreased by 68 % when the gap ratio changed from 0.1 to 0.3. Besides, as the increase of the gap ratio, the average vorticity, turbulent kinetic energy, and Reynolds shear stress in the selected region above the airfoil decreased, while the average velocity increased. In addition, the gap ratio did not have an apparent effect on the transition onset positions and the maximum spanwise vorticity in the flow field.

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间隙比对带脊冰翼面的流场结构和气动性能的影响
在 SLD 结冰条件下,飞机表面可能出现脊冰,导致气动性能显著下降,影响飞机的飞行安全。本研究通过实验研究了间隙比对带脊冰机翼流场结构和气动性能的影响。在低速回流风洞中,利用粒子图像测速仪(PIV)技术和高灵敏度六分量天平进行了详细测量。结果表明,机翼的最大升力系数、失速角和最大俯仰力矩系数随着间隙比的增大而增大。当 AOA = 10 度时,当间隙比从 0 变为 0.1 时,分离气泡长度减少了 77%。同时,当间隙比从 0.1 变为 0.3 时,分离气泡长度减少了 68%。此外,随着间隙比的增大,机翼上方所选区域的平均涡度、湍动能和雷诺切应力减小,而平均速度增大。此外,间隙比对过渡起始位置和流场中的最大跨向涡度没有明显影响。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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