Influence of surface curvature on the impact force of water droplet

IF 2.7 3区 物理与天体物理 Q2 PHYSICS, APPLIED Journal of Applied Physics Pub Date : 2024-09-19 DOI:10.1063/5.0219757
A. Aihara, M. Tanaka, N. Fujisawa
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Abstract

Although the global market for wind energy is growing rapidly, leading-edge erosion is a critical issue hindering the development of wind power. The impact force of a droplet colliding with flat surfaces has been investigated in previous studies. However, the impact force exerted on curved surfaces, such as that experienced by eroded wind turbine blades, is not well understood. This study discusses the relationship between the impact force generated on a solid surface by a water droplet and the radius of curvature of the impacting surface. The impact force by a droplet was measured using a force sensor mounted on semi-cylindrical caps with different radii of curvature. The measurement results showed that the impact force decreased as the radius of curvature decreased. A computational fluid dynamics model solving incompressible flows showed that, unlike the case of a curved surface, the initial momentum of the droplet was mostly transferred to the flat surface. This resulted in a high impulse for an impact with a flat surface. The falling droplet was blocked by the surface, and the lateral jet was accelerated sideward. This acceleration was moderate for curved surfaces. When colliding with a flat surface, a higher impact force was generated owing to the wider area of the excited surface pressure compared with that of the curved surface. Finally, the relationship between the peak of the impact force and the surface curvature was derived, suggesting that the force peak is inversely proportional to the curvature.
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表面曲率对水滴冲击力的影响
虽然全球风能市场发展迅速,但前缘侵蚀是阻碍风能发展的一个关键问题。以往的研究已经对液滴与平面碰撞的冲击力进行了研究。然而,人们对曲面(如受侵蚀的风力涡轮机叶片)所受的冲击力还不甚了解。本研究讨论了水滴对固体表面产生的撞击力与撞击表面曲率半径之间的关系。使用安装在具有不同曲率半径的半圆柱形帽上的力传感器测量了水滴的冲击力。测量结果表明,冲击力随着曲率半径的减小而减小。求解不可压缩流的计算流体动力学模型表明,与曲面的情况不同,液滴的初始动量大部分转移到了平面上。这导致撞击平面时的冲力很大。落下的液滴被表面阻挡,横向射流向侧面加速。对于曲面,这种加速度较小。与平面碰撞时,由于激发表面压力的面积比曲面大,因此产生的冲击力更大。最后,得出了撞击力峰值与表面曲率之间的关系,表明撞击力峰值与曲率成反比。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Applied Physics
Journal of Applied Physics 物理-物理:应用
CiteScore
5.40
自引率
9.40%
发文量
1534
审稿时长
2.3 months
期刊介绍: The Journal of Applied Physics (JAP) is an influential international journal publishing significant new experimental and theoretical results of applied physics research. Topics covered in JAP are diverse and reflect the most current applied physics research, including: Dielectrics, ferroelectrics, and multiferroics- Electrical discharges, plasmas, and plasma-surface interactions- Emerging, interdisciplinary, and other fields of applied physics- Magnetism, spintronics, and superconductivity- Organic-Inorganic systems, including organic electronics- Photonics, plasmonics, photovoltaics, lasers, optical materials, and phenomena- Physics of devices and sensors- Physics of materials, including electrical, thermal, mechanical and other properties- Physics of matter under extreme conditions- Physics of nanoscale and low-dimensional systems, including atomic and quantum phenomena- Physics of semiconductors- Soft matter, fluids, and biophysics- Thin films, interfaces, and surfaces
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