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.