Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : March 14, 2016 - March 15, 2016
Recently, flight characteristic of dragonfly has been investigated by many researchers. Dragonfly wing has many micro spike structures on the wing. These spikes exist on two sides of wing. The length and shape of spikes are 10 to 100 micron meters and circular cone. It is important to clear the effect of micro spike structure on characteristics of dragonfly flight. In this study, a plate with micro spikes is fabricated, flow around the plate was carried out flow visualization and the pressure drag and pressure force of the vertical flat plate with micro spikes was measured. As a result of measurement of, the drag coefficient and the pressure force are reduced and flow separation is delayed with the micro spike structure at lower Reynolds number. As a result of, measurement of the drag coefficient and the pressure force are increased with the micro spike structure at higher Reynolds number.
