论文部分内容阅读
基于卧式海流能发电装置,采用雷诺平均N-S方程,对来流攻角从0°~26°情形下的叶片翼型进行数值模拟,分析比较不同攻角下水动力学特性的变化规律。结果表明:一定范围内增加攻角可有效提高升阻比,但升力系数最大时,升阻比、水翼捕能效率不一定最高,失速角也不一定是最佳攻角,验证了水翼失速的根本原因是边界层的分离;水翼吸力面与压力面的压差较大,此压差为水翼提供较高的升力系数,主要来自于水翼的前半部。此外,还分析了水翼周围流场的速度分布、压力分布等水动力特性与攻角的关系,为设计高效的海流能转换叶片提供了理论参考。
Based on the horizontal sea current energy generation device, the Reynolds averaged N-S equation was used to simulate the blade airfoil from 0 ° to 26 ° and the variation of hydrodynamic characteristics under different angles of attack was analyzed and compared. The results show that increasing the angle of attack within a certain range can effectively increase the lift-drag ratio. However, when the lift coefficient is maximum, the lift-drag ratio and hydrofoil efficiency are not necessarily the highest, and the stall angle is not necessarily the best. The root cause of stalling is the separation of the boundary layer. The pressure difference between the suction side and the pressure side of the hydrofoil is larger. This pressure difference provides the hydrofoil with a higher lift coefficient mainly from the first half of the hydrofoil. In addition, the relationship between the hydrodynamic characteristics such as velocity distribution and pressure distribution of the flow field around the hydrofoil and the angle of attack is also analyzed, which provides a theoretical reference for the design of highly efficient ocean current energy conversion blades.