Measurement of 2-D Flow Field and Force for a Biomimetic Flapping Wing
Date Issued
2007
Date
2007
Author(s)
Tsai, Chang-Chih
DOI
zh-TW
Abstract
This research discusses the biological modelling in hovering flights by the model experiment method for two-dimensional simplified flow field, and narrates some mechanisms in non-steady flow in literatures to make discussion. This experiment not only uses the PTV technology to observe the flow field which produces by the wing plate, but also measures the force on the wing plate at the same time. Regarding each parameter change to make a series of discussions, and it is included the angle of attack, the rotational speed, the flap opportunity and so on. Then, to compare the force with flow field finds the relations between the flow field and force.
1. In the result, the timing of rotation has great effect on the lift performance. For three kinematics conditions, advanced and symmetrical rotations produce more lift force than delayed rotation, especially when the wake capture happened.
2. The angle of attack in upstroke and downstroke is also an important parameter in flapping process, and the results indicate the best lift performance at 50°~60° angle of attack.
3. Angular velocity in rotation affects a little bit on lift performance. Faster speed not only provides more lift force, but also supplies more drag force.
This research will help to proof the mechanisms in non-steady flow and to compare with the result of numerical analysis in future.
Subjects
仿生工程學
撲翼
量力
flapping wing
wake capture
rotational lift
PTV
Type
thesis
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