超低レイノルズ数における櫛形状翼の空力特性

Abstract

The Reynolds number (Re) based on the wing chord of an insect wing is less than 10,000. As the insect size decreases to millimeters in length and Reynolds number decreases to double figures or less, gapped wings with hairs called comb wings appear instead of the membrane wings. For example, plume moths and thrips have comb wings. The purpose of this study is to ascertain the aerodynamic characteristics of comb wings in wind tunnel tests at very low Reynolds numbers less than 100. A wind tunnel, which was operated in a lower pressure environment, and a high sensitivity balance system were developed for these measurements. The lift and drag acting on the flat plate and the comb wing were measured at an angle of attack range of -90deg < α < 90deg with 20 ≤ Re ≤ 500. The comb wing performed well equivalent to the flat plate at Re ≦ 20.