School of Mechanical and Electrical Engineering, Soochow University, Suzhou, China.
Microsc Res Tech. 2024 Aug;87(8):1822-1835. doi: 10.1002/jemt.24562. Epub 2024 Mar 26.
Beetle hindwings have the unique advantages of lightweight and high strength, which play a key role in flight. In this study, the beetle hindwings were cut along the chordal direction, then the first groove microstructure of different vein cross sections was investigated using the 3D microscope system and the laser scanning confocal microscope. It was found that the position of the first groove relative to the entire chordal cross section of the wing gradually moves backward, which has an effect on the flying aerodynamic behaviors of the beetle. Next, three corrugated airfoils learned from the microscopy imaging of the ladybird beetle hindwing were designed. Then, aerodynamic behaviors were calculated by the ANSYS Fluent software, and it was confirmed that the position of the first groove microstructure affects the aerodynamic performance of the airfoil. For further study, the influence of corrugated structural and motion parameters on the aerodynamic, 2D 'simplified' airfoil models with triangular wave airfoil models (TWA models) was developed and studied. RESEARCH HIGHLIGHTS: The position of the first groove microstructure affects the aerodynamic performance of the airfoil. The pressure difference of different corrugation patterns shows significantly asymmetric during the upstroke and downstroke. The aerodynamic is optimal of 2D-TWA models, when the number of corrugations is five, the corrugation is right angle, and the flapping frequency is 75 Hz.
甲虫的后翅具有重量轻、强度高的独特优势，这对飞行起着关键作用。在这项研究中，沿着弦的方向切割甲虫的后翅，然后使用 3D 显微镜系统和激光扫描共聚焦显微镜研究不同脉横截面的第一条凹槽微结构。结果发现，第一条凹槽相对于整个翅弦截面的位置逐渐向后移动，这对甲虫的飞行空气动力行为有影响。接下来，从瓢虫后翅的显微镜成像中设计了三个波纹翼型。然后，通过 ANSYS Fluent 软件计算空气动力行为，并证实第一条凹槽微结构的位置影响翼型的空气动力性能。为了进一步研究，对波纹结构和运动参数对空气动力的影响，研究并开发了具有三角形波翼型（TWA 模型）的 2D“简化”翼型模型。研究亮点：第一条凹槽微结构的位置影响翼型的空气动力性能。不同波纹图案的压差在上下冲程中表现出明显的不对称性。当波纹数为 5、波纹为直角且拍打频率为 75Hz 时，2D-TWA 模型的空气动力性能最佳。
