期刊
THEORETICAL AND APPLIED MECHANICS LETTERS
卷 11, 期 5, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.taml.2021.100297
关键词
Topographic effects; Pressure gradient; Turbine wake; Power output
类别
资金
- Department of Mechanical Science and Engineering at the University of Illinois
Wind-tunnel experiments were conducted to investigate the impact of favorable and adverse constant pressure gradients on the flow field downstream of a model wind turbine. Results showed that the pressure gradients induced wake deflection and modulation, significantly affecting the overall flow recovery.
Wind-tunnel experiments were performed to study the effect of favorable and adverse constant pressure gradients (PG) from local changes in the topography right downwind of a model wind turbine. Particle image velocimetry was used to characterize the near and intermediate wake regions. We explored five scenarios, two favorable, two adverse PG, and a case with negligible PG. Results show that the PGs induce a wake deflection and modulate the wake. They imposed a relatively small impact on the turbulence kinetic energy and kinematic shear stress but a comparatively dominant effect on the bulk flow on the flow recovery. Based on this, a simple formulation is used to describe the impact of PG on the wake. We modeled the base flow through a linearized perturbation method; the wake is obtained by solving a simplified, integrated streamwise momentum equation. This approach reasonably estimated the flow profile and PG-induced power output variations. (C) 2021 The Authors. Published by Elsevier Ltd on behalf of The Chinese Society of Theoretical and Applied Mechanics.
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