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7. PLASMA ACTUATOR OPTIMIZATION 6.1Objectives Practical flow control applications demand robust actuators that have sufficient authority for operation in Reynolds and Mach number regimes typical of commercial andmilitary aircraft. A primary objective of the work reported in this chapter is theoptimization of the SDBD plasma actuator with the goal of improving the actuatorauthority for application in higher Reynolds number flows than previously possible.. However, thesestudies involved SDBD plasma actuators that use a thin layer (typically 0.1—1 mm) ofKapton polyimide film as the dielectric barrier. The work reported here builds upon theseprevious investigations by performing a comprehensive parametric study in which theeffects of dielectric material and thickness, voltage amplitude and frequency, voltagewaveform, exposed electrode geometry and the number of actuators in series are eachexamined. The metric used to evaluate the performance of the actuator in each case ismeasured actuator-induced thrust which is proportional to the total body force. This workwas done simultaneously with the flow control studies reported in the previous twochapters, so, the results of this study are partially applied to those chapters. 6.2.Experimental Facility The experimental facility used in this investigation consists of two primary components: (1) a plasma generation system and (2) a test cell assembly where plasmainduced momentum is measured directly as thrust on a sensitive force balance. In addition, velocity profiles of the actuator-induced flow are obtained at representative locations downstream of the edge of the exposed electrode. These components are each described in this section. A schematic of the experimental setup for measuring the thrust produced by a plasma actuator is shown in. The plasma actuator is mounted on a flat surface made of a user-selected dielectric barrier material. This surface is supported vertically in a block of light weight insulating foam material. The entire assembly is placed on a high precision electronic force balance which has a resolution of 0.098 mN (0.01 gm). The plasma actuator is oriented in such a way that when an AC voltage is applied, the resulting actuator-induced flow is directed upwards and the reactive thrust acting downward is measured directly by the balance. The entire actuatorassembly and the force balance are isolated 26PDF Image | PLASMA FUNCTIONALIZATION OF MULTI-SCALE STRUCTURES
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