Modelling of DBD plasma actuator for controlling noise from a tandem cylinders configuration

Paper in proceeding, 2019

Aeroacoustic noise, generated by aircraft landing gears during the take-off or landing manoeuvres, is considered excessive, causing environmental concerns for the people living close to airports. Therefore, there is an increasing need to innovate new technologies to reduce landing gear noise. For noise reduction, it is primarily important to understand the mechanism of flow-induced landing-gear noise generation and, further, to adapt relevant new technologies to the system in order to reduce noise levels by means of effective manipulation of related aerodynamic flow features. Dielectric Barrier Discharge (DBD) plasma actuators have shown efficiency to control flow separation from bluff bodies, consequently, mitigating subsequent vortex motions and noise generation. In the present paper, a simplified landing-gear model represented by a tandem-cylinders configuration has been used. The airflow has been simulated using hybrid RANS/LES. Effects of the plasma actuation are modelled using two different models. These include the Suzen & Huang model, which solves for the electric field and charge density fields in order to obtain the body force, and the Greenblatt model, which simply assumes that the body force decays exponentially both downstream and normal to the actuator.