Electromagnetic Force Of Airfoil Stall Control

This project regards as a part of the domain of electromagnetic fluid control. Thecontrolling effects of flow past hydrofoil and specially hydrofoil stall with electromagneticbody forces(Lorentz force) had been investigated in experimentation.Based on the two-dimensional, incompressible and dimensionless Navier-Stokesequations and equations of Electromagnetic field and Hydrodynamics, the distributingcharacteristic of the electromagnetic field and the electromagnetic force on the surface ofelectro-magnetic actuator have been obtained by numerical simulations. The flow fieldaround hydrofoil modification processing, the controlling effects of vortex suppression anddrag reduction have been conducted and discussed in evidence. The experimental controlsystems are based on DSP chip TMS320F2812, the movement of hydrofoil and theparameters of experinatation may be simulated practically, and the experimental resultsmay be got easily. The effects of different attack angle, different Reynolds number anddifferent electromagnetic force magnitude on the boundary layer structure have been takeninto account.By compared with experimental results, the research requirements and tasksmentioned above were analyzed and discussed. The conclusions obtained are as follows:1. The forces which be generated by the electromagnetic field and localized aroundthe hydrofoil surface present periodic pulsatile distributing and rapidly attenuating atnormal to wall direction.2. The control system can satisfy with basic require of experimentation. The controlprecision of attack angle gets to 0.9°3. The electromagnetic body forces can obviously improve the boundary layerstructure and suppress the boundary layer separation. Furthermore, the electromagneticforce provides with the effective affects for increasing the lift forces of the hydrofoil andcontrolling the hydrofoil stall.The research conclusions may be provided more experimental evidences forinvestigation of the mechanism of flow past hydrofoil with electromagnetic body forcescontrolling.