4 | Discussions
4.1 | TWA Models
To further study the influence of
corrugated parameters on the aerodynamic performance of airfoil,
the
TWA models were modelled with a generalized AP1 as starting point, as
shown in Figure 7 (a).
The
number of corrugations and the
corrugation angle were selected
as the structural parameters, and the flapping frequency was set as the
motion parameter. From Table 3, The average
chord
length c , the corrugated average height h , and the airfoil
thickness n were obtained based on CA models. These values were
used still in TWA models. Other settings are as follows:
1. The number of corrugations were set as from 1 to 8 in sequence.
Figure 7 (a) shows a model with the corrugation number of 3.
2. Three different corrugation angles were set,
namely an acute angle
(45°),
a right angle (90°) and an obtuse angle (135°), as shown in Figure7 (a).
3. Three different flapping frequencies were used, namely low frequency
(55 Hz), medium frequency
(65
Hz), high frequency (75 Hz).
4. The flat plate airfoil model (FPA) was designed as the comparative
model with the same chord length c and thickness n .
Table 3 Parameters of TWA models