5 | CONCLUSION

To explore the effect of groove microstructure on aerodynamic behaviors of Asian ladybeetle corrugated hindwing, the microstructure of a cross section of the hindwing was observed using the 3D microscope system and LSCM. It was found that the groove’s thickness is different in the three positions, and the position of the first groove relative to the entire chordal cross-section of the wing gradually moves backwards.
According to microstructure test results, The CA models (AP1, AP2 and AP3) were designed, which can study the effect of corrugated airfoil on aerodynamic characteristics. It was found that thel of the AP1 model was always the highest at different flapping frequencies. The growth rates of thel are 6.28% (55 Hz), 27.41 % (65 Hz), and 25.35% (75 Hz) larger than AP2 model; are 107.14% (55 Hz), 58.86 % (65 Hz), and 65.85% (75 Hz) larger than AP3 model. In addition, the\(\overset{\overline{}}{C_{l}/C_{d}}\) of the AP1 model is always the highest at various frequencies. Based on AP1 model, the TWA models are designed which simulated the optimal aerodynamic characteristics. When the number of corrugations to be 5, a right corrugation angle, and the flapping frequency is 75 Hz, TWA model has optimal aerodynamic performance.
This study proves that the effect of groove microstructure on aerodynamic behaviors, and also explains the excellent functional performance of the bionic flexible corrugated wing, and it has certainly significance for the design of flexible wings for bionic FWMAV.