The Electromagnetic Force Of The Airfoil Flow Around Optimal Control

Utilizing with the electromagnetic force (Lorentz force), the optimal control of flow around hydrofoil has been conducted both by experimental and numerical simulation methods. The main studies were included the following two aspects.1. The optimal design of DSP-based system of the hydrofoil motion control devicesThe actual formation of the airfoil dynamic process have been simulated by using TMS320F2812 (DSP chips) control system. The control system performance has been improved by considering with the results of MATLAB simulation and analysis of system control laws. The location accuracy and stability of the hydrofoil moving control have been enhanced by optimization of the hardware and software.2. The optimal control of flow around hydrofoil utilizing with electromagnetic force The different distributing characteristic of the electromagnetic field and theelectromagnetic force on the surface of electromagnetic actuator have been obtained by numerical simulations. In view of different motion state of hydrofoil, different pole width of electromagnetic actuator and different electromagnetic field scale area, the optimal control experiments of flow around hydrofoil utilizing with electromagnetic force have been conducted. The process of control by electromagnetic force in the flow around hydrofoil and the evolvement of the vortex have been discussed, the corresponding experimental results have been obtained.Unifying the correlation of theories knowledge, analyzing the experimental and the numerical simulation results, the following conclusions have been achieved.(1)The realization of nimble control of the multi-mode motion of hydrofoil, the position and speed of hydrofoil may have been facilitated by the hydrofoil movement control system. The precision of hydrofoil attack angle control may be improved from 0.9°to 0.09°by reduction gear, and the movement stability of hydrofoil enhanced simultaneously also.(2)Different characteristic of the Lorentz force fluctuation on the electromagnetic actuator surface have been presented. The penetration ability of the electromagnetic force may become weaker as the electromagnetic pole width became smaller.(3)The structure of the boundary layer around the hydrofoil may be modified obviously by electromagnetic body forces, the separation of the boundary layer and the vortex street may be suppressed. To some experimental and analysis conditions, there may be existed an appropriate electromagnetic pole width and acting scale of the electromagnetic actuator.