| This paper studies and designs the control system of electromagnetic actuators used for adjusting fluid boundary layer. It is in the control engineering and hydromechanics overlapping domain, belongs to the application foundation research.Referenced the study of foreign reports, this paper designs and achieves the control object-electromagnetic actuator which is composed of electrode and the magnetic pole alternate permutation. When the weak electrolyte solution flows through the actuator, the charged particles in the solution produce spanwise motion by the electromagnetic force. Thus restrain the fluid boundary layer rapids burst, to flow to the whorl and the banding production and change fluid boundary layer structure. Therefore reduce the friction drag of the fluid boundary layer and realizes fluid boundary layer drag reduction control by functional materials electromagnetic actuator.In this paper, the core control system is an embedded integration card (PCI-8554 timing card). The preparation of control systems window interface so that the flexibility of each channel and the frequency of its time interval set, thus achieving control signal frequency and phase shift of control. By regulating the output voltage size of regulator DC power supply, achieve the control signal amplitude control. Research and design fluid boundary layer resistance testing equipment to test the actuator suffered in the resistance of fluid. Use this control system for different velocity, frequency, voltage experimental study and got the actuator to fluid boundary layer control results. The flow field which does through the tracing granule demonstrates indicated that we can use the visual observation electromagnetic actuators to fluid boundary layer control action under the condition of AC voltage in the frequency of less than 1Hz, more than 1V amplitude. This conclusion lays the foundation for further research the electromagnetic actuators to fluid boundary layer drag reduction. |
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