B-343 GA 規範フィードバック制御システムによる乱流摩擦抵抗低減に関する研究

概要

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A prototype feedback control system for wall turbulence is developed and evaluated in a turbulent channel flow. Arrayed micro hot-film sensors with a spanwise spacing of 1 mm are employed for the measurement of streamwise wall shear stress fluctuations, while arrayed magnetic actuators with 3.2 mm in spanwise width are used to introduce control input through wall deformation. The frequency response of the sensors and actuators is found to be reasonably high for the flow conditions presently considered. A digital signal processor with a time delay of 1.6 ms is employed to drive output voltage for the actuators. Feedback control experiments are made in a turbulent air channel flow with the aid of a genetic algorithm-based optimal control scheme. It is found that the root-mean-square value of the wall shear stress fluctuations is decreased by up to 9% among 100 trials in 10 generations.
日本流体力学会の論文
2003-07-28