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Simulation on flow control strategy of synthetic jet in an vertical axis wind turbine

机译：垂直轴风力发电机中合成射流的流量控制策略仿真

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The purpose of present paper is to adopt two-dimensional numerical simulation to investigate the flow field and flow control effect around a straight-bladed vertical axis wind turbine (SB-VAWT) with utilizing synthetic jet active flow control technique which has become a research focus. The numerical simulation results for power coefficients of clean SB-VAWT have been validated by comparing with experimental results. In order to take account of the control effect of orifice quantity, jet momentum coefficient and synthetic jet control strategy, the numerical simulation of the SB-VAWTs with different number of orifices and 5 different control strategy of synthetic jet actuator have been carried out by using unsteady Reynolds-averaged Navier-Stokes (URANS) in ANSYS FLUENT with Realizable k-epsilon turbulence model and Scalable wall function. The aerodynamic coefficients (power coefficient, torque coefficient) and vorticity field around the blades of the SB-VAWT are comprehensively obtained. The results show that the synthetic jet actuator has positive effect to improve the aerodynamic performance for SB-VAWT. The utilization of synthetic jet actuator with 2 orifices around trailing edge of blades and upward parabola synthetic jet control strategy at 0.035 jet momentum coefficient increases the power coefficient by 15.2%. Besides, this increment in power coefficient decreases with the increasing number of orifices and the synthetic jet actuator brings about more intense load fluctuation than the clean one. Furthermore, the trailing vortices produced and blades less interact with each other, resulting in less vorticity magnitude of shedding vortices and less complexity of flow structure. (C) 2018 Elsevier Masson SAS. All rights reserved.
机译：本文的目的是采用二维数值模拟，利用合成射流主动流控制技术研究直叶片垂直轴风力发电机（SB-VAWT）周围的流场和流控制效果，这已成为研究重点。 。通过与实验结果进行比较，验证了清洁SB-VAWT功率系数的数值模拟结果。为了考虑节流孔口数量，射流动量系数和合成射流控制策略的控制效果，通过使用不同的节流孔数和5种不同的合成射流致动器控制策略，对SB-VAWT进行了数值模拟。具有可实现的kε湍流模型和可伸缩壁函数的ANSYS FLUENT中的非稳态雷诺平均Navier-Stokes（URANS）。综合获得了SB-VAWT叶片周围的空气动力学系数（功率系数，扭矩系数）和涡流场。结果表明，合成射流致动器对改善SB-VAWT的空气动力学性能具有积极作用。在叶片后缘周围有2个孔的合成射流致动器的使用以及在0.035射流动量系数的向上抛物线合成射流控制策略的作用下，功率系数提高了15.2％。此外，功率系数的这种增加随着孔口数量的增加而减小，并且合成射流致动器比清洁射流致动器引起更大的负载波动。此外，产生的尾随涡流和叶片之间的相互作用较少，从而导致脱落涡流的涡度较小，流结构的复杂度较小。 （C）2018 Elsevier Masson SAS。版权所有。

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