Applications of String-type DBD Plasma Actuators for Flow Control in Turbomachineries

String-type dielectric barrier discharge plasma actuators (string-type DBD-PAs) , which consist of metallic wires coated by insulating materials and exposed electrodes, were developed for enlarging the usages in various turbomachineries, such as technologies for mitigating flow separation and tip leakage flow. Properties of flow induced by various stirng-type DBD-PAs were analyzed by PIV measurements. New tube-type DBD-PA made of quartz glass tube was also manufactured and feasibility tests showed that it can have greater durability by injecting gases for cooling and by being used under higher temperatures found in realistic conditions where the turbomachineries such as gas turbines are working.