Impact de la pression et de la température sur la performance d'un actionneur plasma de type DBD

This research project aims to study the performance of a DBD type plasma actuator under high pressures and high air temperatures. The plasma actuator is a purely electric device, operating without moving parts, and transforms electricity into momentum through collisions between plasma particles and those of neutral gas. This feature has spawned several studies on the potential of the plasma actuator in aerodynamic applications. Indeed, it seems very interesting for the control of movement on the wings of planes, or in the turbines and compressors of the turboshaft engines. Thus, a study of the performance of this device under different atmospheric conditions is essential. This work represents the first study on the coupled effect of high pressure and temperature on the performance of a plasma actuator. An enclosure with high pressure and temperature, in which the actuator operates, was manufactured. The effect of the device on the velocity field was measured via the PIV measurement technique. The velocity fields allowed, via momentum conservation, to calculate the thrust generated by the actuator. Optical observation also made it possible to measure the plasma formation threshold voltage. Tests were also conducted for pressures of 1 to 6 bar and temperatures of 20 ° C to 200 ° C. The results obtained show large variations in the operation of the plasma actuator when pressure and temperature increase in the margins studied. Indeed, the study has shown that the increase in pressure adversely affects the performance, and makes the device almost ineffective from 3 bar. The study of the second case shows that the temperature positively affects the performance of the actuator, by adding 80% of actuating force between 20°C and 150°C, unlike the pressure. Finally, the results showed that the coupling of temperature and pressure is almost linear. Indeed, even at high temperature, a high pressure has a negative contribution, and vice versa. In this case the increase in temperature up to 200 ° C could compensate for only a 1 bar increase in pressure.