マイクロセンサ・アクチュエータ群を用いた壁乱流フィードバック制御システムの構築と評価(流体工学,流体機械)

概要

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A prototype system for feedback control of wall turbulence is developed, and its performance is evaluated in a physical experiment. Arrayed micro hot-film sensors with a spanwise spacing of 1 mm are employed for the measurement of the streamwise shear stress fluctuations, while arrayed magnetic actuators of 2.4mm in spanwise width are used to introduce control input through wall deformation. A digital signal processor having a time delay of 0.1ms is employed to drive output voltage for the actuators. Feedback control experiments are made in a turbulent air channel flow. A noise-tolerant genetic algorithm is employed to optimize control parameters. It is found that the wall shear stress is decreased by about 6% experimentally for the first time. The Reynolds shear stress close to the wall is decreased by the present control. By using conditional average of a DNS database, it is demonstrated that wall induces wall-normal velocity away from the wall, when high speed region is located above the actuator.
社団法人日本機械学会の論文
2006-03-25