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The ef fects of dif fer ent ef fec tive an gle of at tack mo tions on flap ping foil are con sid ered. En ergy ex trac tion char ac ter is tics of par al lel foils with com bined plung ing and pitch ing mo tions at mul ti ple work ing con di tions are sys tem at i cally an a lyzed. The en ergy ex trac tion pro cesses of dual foil at dif fer ent ef fec tive an gle of at tack mo tions and re duced fre quen cies are sim u lated, re spec tively. In the range of pa ram e ters dis cussed in this pa per, the in crease of Ke im proves the en ergy ex trac tion per for mance of foil ef fec tively. Ev ery ef fec tive an gle of at tack mo tion has a fre quency which can ob tain the op ti mal ex trac tion per for mance. The op ti mal en ergy ex trac tion work ing con di tion is Ke = 2 and k = 0.8, where the ex trac tion ef fi ciency of dual foil achieves 25.8%. The synchronicity of the aero dy namic lift and the plung ing mo tion is in creased with in crease in Ke. This pa per pro vides a sig nif i cant ref er ence to the fur ther study and pop u lar iza tion in en gi neer ing prac tice of par al lel foils en ergy ex trac tion.

Numerical study into the effects of effective angle of attack motions on energy extraction performance of parallel foils