抄録
Recently, a few study on unsteady flow at low Reynolds number region have been developed by the interest in the micro-electro-mechnical systems (MEMS). However, the unsteady fluid forces acting on a moving airfoil have not been measured sufficiently and the relation between flow patterns and them has not been clarified. In the present study, the flow patterns around pitching airfoils such as five kinds of airfoils have been visualized by two kinds of dyes and dynamic fluid forces acting on them have been measured by a six-axes sensor in a water tunnel at low Reynolds number region. The separation from the leading edge began to reattach to the suction surface as the angle of attack in creased. The reattachment had little influences on the dynamic lift at low angle of attack and much influences at high angle of attack. The reattachment had little influences on the dynamic drag.
