| 吉天鹏,林韶明,高振,王娟.香蕉叶片风致撕裂形态演变规律及动态响应特性研究[J].中国南方果树,2026,55(4):102-109 |
| 香蕉叶片风致撕裂形态演变规律及动态响应特性研究 |
| Study on Morphological Evolution and Dynamic Response Characteristics of Wind-Induced Tearing in Banana Leaf |
| 投稿时间：2025-03-18 修订日期：2025-05-09 |
| DOI： |
| 中文关键词: 关键词：香蕉叶片 风致撕裂 流固耦合 叶片重构 动态特性 |
| 英文关键词:Banana leaf Wind-induced tearing Gas-solid coupling Leaf reconfiguration Dynamic characteristics |
| 基金项目:国家自然科学基金青年科学基金 国家自然科学基金国际（地区）交流与合作项目 海南省重点研发计划项目 |
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| 中文摘要: |
| 【目的】近年来，随着植保无人机在香蕉林施药作业中的规模化应用，冠层结构动态响应与气固耦合作用机理逐渐成为制约精准施药的核心科学问题。当前研究多集中于作物冠层在稳态均匀流场下的静态气动特性表征，然而实际作业场景中，冠层需同时承受旋翼下洗气流与环境自然风的复合作用。现有研究多忽略环境自然风的作用，同时鲜有涉及真实作业场景中的撕裂叶片，叶片损伤与动态流场的耦合效应的影响机制尚不明确。【方法】本研究基于农用航空高低速复合风洞试验系统，构建包含高速摄影相机、热敏式风速仪等在内的蕉叶变形测试系统，以“宝岛七号”成熟蕉叶为试验对象，创新性地提出用三个角度参数表征蕉叶形态变化，探究香蕉叶片在自然风速（1-5 m/s）下的变形、撕裂及动态响应特性机理。【结果】结果表明：低风速（1-2 m/s）时叶片撕裂程度对变形影响较小；风速达3 m/s时，撕裂叶片通过裂缝重构流场，振荡幅度减小（较未撕裂叶片角度变化量衰减24.60%、74.68%、80.36%）；而风速4-5 m/s时，结构刚度劣化导致变形加剧（角度变化量增加35.09%、50.88%、69.83%）。无量纲分析显示角度变化与雷诺数（Re）呈线性函数正相关、与植物柯西数（Cy）呈幂函数关系。【结论】研究揭示了蕉叶“损伤梯度-流场重构-力学响应”机制，明确损伤诱导流场重构对蕉叶动力学行为的调控规律，为植保无人机喷施香蕉作业参数与冠层动态响应的适配性提供参考。 |
| 英文摘要: |
| Abstract：【Objective】In recent years, with the large-scale application of plant protection UAVs in pesticide spraying operations in banana plantations, the dynamic response of canopy structures and the mechanisms of fluid-structure interaction have emerged as critical scientific challenges limiting precise pesticide application. Current research predominantly focuses on the static aerodynamic characterization of crop canopies under steady-state homogeneous flow fields. However, in real-world operational scenarios, canopies are subjected to combined aerodynamic effects from rotor-induced downwash flow and ambient natural wind. Existing studies often neglect the role of ambient natural wind and rarely address torn leaves in real-world operational scenarios, resulting in an insufficient understanding of the coupling mechanisms between leaf damage and dynamic flow fields. This knowledge gap hinders the optimization of pesticide deposition efficiency and mechanical risk assessment in UAV-based operations.【Method】This study employs an agricultural aviation high-low-speed composite wind tunnel test system and establishes a banana leaf deformation measurement system incorporating high-speed cameras and thermal anemometers. Using mature "Baodao 7" banana leaves as test subjects, we innovatively propose three angular parameters to characterize leaf morphological changes, investigating the deformation, tearing, and dynamic response mechanisms of banana leaves under natural wind speeds (1-5 m/s).【Results】Results demonstrate: (1) At low wind speeds (1-2 m/s), leaf tearing minimally affects deformation; (2) At 3 m/s, torn leaves reconstruct flow fields through cracks, exhibiting reduced oscillation amplitudes (angular variation decreased by 24.60%, 74.68%, and 80.36% compared to intact leaves); (3) At 4-5 m/s, structural stiffness degradation intensifies deformation (angular variation increased by 35.09%, 50.88%, and 69.83%). Dimensionless analysis reveals angular variation positively correlates with Reynolds number (Re) through a linear function and relates to plant Cauchy number (Cy) via a power function. 【Conclusion】This study reveals the "damage gradient-flow field restructuring-mechanical response" mechanism in banana leaves, clarifying the regulatory effects of damage-induced flow field restructuring on their dynamic behavior. The findings provide insights into optimizing the compatibility between operational parameters of plant protection UAVs and canopy dynamic responses during banana spraying operations. |
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