Study on EHD fan with two-dimensional electrode system (effect of ionic-wind type on performance and optimum arrangement of electrode)

摘要

An EHD (Electro-hydrodynamics) fan is produced and tested, in which a thin metallic-wire is used as a discharge electrode, and two plates as collecting electrode. The plates are partly the opposite members of a rectangular duct, and each inside edge of the two plates is used as collecting electrode. The wire and the two plate-edges are set parallel and at same intervals. The characteristics of the fan are experimentally made clear under electrode arrangement at which the largest efficiency is obtained. As a result of experiment for selecting effective kind of ionic wind among positive, negative and alternate ionic wind, positive one show maximum efficiency, and mean velocity of each ionic wind is in proportion to square root of ion current. The positive one is used to obtain the flow rate, total pressure, and efficiency of the fan. Maximum efficiency is obtained under the condition that the distance between two electrode plates is 30 mm and the gap-length is 33.5 mm.