An important issue in the study of active flow control by dielectric barrier discharge plasma actuators is the implementation of a model that accurately predicts the induced flow. In this study different numerical plasma models were compared, by estimating the Lorentz force generated by the plasma without spatially resolving the plasma chemistry directly. The body force distribution computed with each model was introduced in the CFD code to compute the resulting velocity field induced by the plasma actuators on a quiescent flow on a flat plate. The limit of many of these models is the necessity to calibrate some parameters, as the charge distribution on the dielectric surface. In the present study a unique method has been defined to establish this parameter, by applying an unsteady plasma model based only on the solution of the electrostatic potential field. Steady linear body fields were also estimated based on results of the previous unsteady plasma models and applied to simulate plasma effects on a highly loaded compressor cascade. By the active flow control the secondary flow is successfully reduced, resulting in a decreased total pressure loss and a rise in the static pressure.
COMPARING PLASMA ACTUATOR MODELS AND APPLICATION ON A COMPRESSOR CASCADE
DE GIORGI, Maria Grazia;BELLO, DANIELA;TRAFICANTE, STEFANIA;FICARELLA, Antonio
2013-01-01
Abstract
An important issue in the study of active flow control by dielectric barrier discharge plasma actuators is the implementation of a model that accurately predicts the induced flow. In this study different numerical plasma models were compared, by estimating the Lorentz force generated by the plasma without spatially resolving the plasma chemistry directly. The body force distribution computed with each model was introduced in the CFD code to compute the resulting velocity field induced by the plasma actuators on a quiescent flow on a flat plate. The limit of many of these models is the necessity to calibrate some parameters, as the charge distribution on the dielectric surface. In the present study a unique method has been defined to establish this parameter, by applying an unsteady plasma model based only on the solution of the electrostatic potential field. Steady linear body fields were also estimated based on results of the previous unsteady plasma models and applied to simulate plasma effects on a highly loaded compressor cascade. By the active flow control the secondary flow is successfully reduced, resulting in a decreased total pressure loss and a rise in the static pressure.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
