STUDY ON APPLICABILITY OF NEW GENERATION VORTEX IDENTIFICATION METHOD FOR COMPLEX WAKE VORTEX IDENTIFICATION OF WIND TURBINES UNDER LARGE YAW CONDITIONS

Ji Renwei; Sun Ke; Zhu Renqing; Zhang Xingyu; Zhang Ge; Zhang Yuquan

doi:10.19912/j.0254-0096.tynxb.2022-0179

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (7) : 486-495. DOI: 10.19912/j.0254-0096.tynxb.2022-0179

STUDY ON APPLICABILITY OF NEW GENERATION VORTEX IDENTIFICATION METHOD FOR COMPLEX WAKE VORTEX IDENTIFICATION OF WIND TURBINES UNDER LARGE YAW CONDITIONS

Ji Renwei¹, Sun Ke^1,2, Zhu Renqing³, Zhang Xingyu¹, Zhang Ge¹, Zhang Yuquan⁴

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Abstract

To further understand the complex wake characteristics of tandem wind turbines under large yaw conditions, four different vortex identification methods （first generation Vorticity, second generation Q, third generation Liutex, and third generation New Omega） are used to visualize the wake vortex structure of tandem wind turbines, so as to explore the applicability of the new generation （third generation） vortex identification methods （Liutex and New Omega） under large yaw conditions. Firstly, based on the actuator line （AL） model and a localized dynamic Smagorinsky （LDS） sub-grid scale （SGS） model, a refined numerical simulation framework （AL-LDS coupling model framework） for wake simulation of the horizontal-axis wind turbine with high accuracy and low computational cost is developed. Secondly, the NREL-5MW wind turbine is selected as the research object. The simulation results of the AL-LDS coupling model are compared with the NREL reference value to validate the accuracy of the AL-LDS coupling model. Finally, the post-processing program of the latest third generation vortex identification methods （Liutex and New Omega） are compiled, and the new generation vortex identification methods are applied to the wake vortex identification of tandem wind turbines under large yaw conditions, so as to analyze the complex wake vortex flow mechanism between multiple wind turbines. The results show that the AL-LDS coupling model has high simulation accuracy, the third generation vortex identification methods are also suitable for the visualization of wind turbines wake vortex structure under large yaw conditions, and can capture the paired vortex shedding phenomenon and broken weak vortex structures in the wake.

Key words

wind turbines / actuator line / large eddy simulation / yaw / new generation vortex identification methods / refined numerical simulation

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Ji Renwei, Sun Ke, Zhu Renqing, Zhang Xingyu, Zhang Ge, Zhang Yuquan. STUDY ON APPLICABILITY OF NEW GENERATION VORTEX IDENTIFICATION METHOD FOR COMPLEX WAKE VORTEX IDENTIFICATION OF WIND TURBINES UNDER LARGE YAW CONDITIONS[J]. Acta Energiae Solaris Sinica. 2023, 44(7): 486-495 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0179

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