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Hysteretic characteristics of monoplane and biplane Wells turbine for wave power conversion

机译：波浪功率转换的单平面和双平面Wells涡轮的滞后特性

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摘要

Monoplane and biplane Wells turbines for wave power conversion have hysteretic characteristics in a reciprocating flow. In this paper, the mechanisms of the hysteretic behaviors were elucidated based on unsteady 3 dimensional Navier-Stokes numerical simulations. For the monoplane Wells turbine, the hysteretic loop is opposite to the well known dynamic stall of an airfoil. It was found that the hysteretic behavior was associated with a streamwise vortical flow appearing near the suction surface. For the biplane Wells turbine, the hysteretic behavior was similar to that of the monoplane at lower attack angles, but the hysteretic loop similar to the dynamic stall was observed at higher attack angles, which was attributed to unsteady flow separation near the hub and the trailing edge of the suction surface of the upstream blade.
机译：用于波功率转换的单翼和双翼Wells涡轮在往复运动中具有滞后特性。在本文中，基于非稳态3维Navier-Stokes数值模拟，阐明了滞后行为的机理。对于单平面韦尔斯涡轮机，磁滞回线与众所周知的机翼动态失速相反。发现滞后行为与在吸力表面附近出现的水流涡流有关。对于双翼飞机的Wells涡轮机，在较小的攻角下，其滞后特性类似于单翼飞机，但在较大的攻角下，其滞后特性类似于动态失速，这是由于轮毂和尾部附近的流动不稳定而造成的。上游叶片吸力表面的边缘。

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