Development of Compact Electrodynamic Zero-Net Mass-Flux Actuators
47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition
This work presents the systematic modeling, design and fabrication of compact electrodynamic zero-net mass-flux (ZNMF) actuators for flow control applications. The electrodynamic actuation scheme employs a small magnetic assembly and composite diaphragm with a rigid center boss and compliant outer annular region. The magnetic assembly is modeled using a 1-D magnetic circuit approach to predict the magnetic field acting on the driver coils. The composite diaphragm is modeled as a transversely
... s a transversely isotropic, clamped plate. An overall system model is obtained by combining previously developed lumped models of the cavity/orifice structures with lumped models for the composite diaphragm and electrodynamic actuation. The complete lumped element model is then used to derive insights regarding performance characteristics and limitations. The model is validated with experimental results for three different actuator configurations. Velocities greater than 35 m/s are achieved over a frequency range 50 Hz -200 Hz using a 30 mm diameter, 50 cm 3 total volume, 80 g actuator. 2 approach. The lumped element model provided very good agreement between the predicted and measured frequency response functions of several ZNMF actuators. In analogous fashion, one goal of this work is to use the LEM approach to develop and experimentally validate an equivalent circuit model for electrodynamic ZNMF actuators. The models for the magnetic assembly and the mechanical driver are coupled with the fluidic models to obtain the overall system equivalent circuit model of the actuator. The resulting model facilitates the intelligent design of electrodynamic actuators. The design tradeoffs and fabrication methods are discussed, and validation experiments are presented.