Botero Nicolas, Ratkovich Nicolas, Lain Santiago, Lopez Mejia Omar D
Computational Mechanics Research Group, Department of Mechanical Engineering. Universidad de los Andes, Cra 1 Este # 19 A 40, 111711, Bogotá, Colombia.
Department of Chemical and Food Engineering, Universidad de Los Andes, Cra 1 Este # 19 A 40, 111711, Bogotá, Colombia.
Heliyon. 2022 Jul 19;8(8):e10017. doi: 10.1016/j.heliyon.2022.e10017. eCollection 2022 Aug.
In the present work, a vertical axis turbine with straight blades was analyzed through a numerical simulation in three dimensions, the performance of the turbine was studied while synthetic jets were used as an active flow control method. To carry out the simulations, the Unsteady Reynolds Averaged Navier-Stokes (URANS) equations were solved on Star CCM+, through the k-ω SST turbulence model. The dynamics of the turbine movement were described using the Overset Mesh technique, capturing the transient characteristics of the flow field. Hydrodynamic coefficients and vorticity fields were obtained to describe the flow behaviour, and the results were compared with two-dimensional simulations of the same system. Turbine performance with tangential synthetic jets located on the intrados and extrados of the airfoil shows an increase in the torque and power output of the turbine. Moreover, using simple estimates, synthetic jets used less power than the increment in power generated at the turbine shaft, showing that efficiency of the turbine increases with the use of synthetic jets. However, the increment in the turbine performance is not as high as in previous two-dimensional studies reported in the literature.
在本研究中，通过三维数值模拟对具有直叶片的垂直轴涡轮机进行了分析，在使用合成射流作为主动流动控制方法的同时研究了涡轮机的性能。为了进行模拟，在Star CCM+上通过k-ω SST湍流模型求解非定常雷诺平均纳维-斯托克斯（URANS）方程。使用重叠网格技术描述涡轮机运动的动力学，捕捉流场的瞬态特性。获得了流体动力系数和涡度场以描述流动行为，并将结果与同一系统的二维模拟进行了比较。在翼型内弧和外弧上设置切向合成射流时，涡轮机性能显示出扭矩和功率输出增加。此外，通过简单估算，合成射流消耗的功率低于涡轮机轴上产生的功率增量，表明使用合成射流可提高涡轮机效率。然而，涡轮机性能的增量不如文献中先前报道的二维研究那么高。
