Determination of Ambient Turbulence Intensities for Stratified Atmospheric Flow

H. Yazicioglua, T. Karab, M. Ozbekb aTechnical University of Denmark, Department of Wind Energy, Denmark bIstanbul Bilgi University, Faculty of Engineering and Natural Sciences, 34060 Istanbul, Turkey

Full Text PDF

The purpose of this study is to develop a numerical methodology which will allow the user to generate ambient turbulence intensities with respect to ambient wind speed for various flow conditions over completely flat terrain. The wind characteristics to be used in the analyses will be directly acquired by wind turbine sensors and measurement tower. The main objective of the work is to show that ambient and wake turbulence levels can be well presented with the developed methodology. The time resolution can be easily adjusted by the user. The developed framework has been validated with the nacelle and rotor effective wind speed model based turbulence intensity levels for all defined atmospheric stratification conditions. It is clear that the wake propagation is stimulated quite accurately and dissipation of the wake depends on the wake model in terms of deficit. The results have shown very good consistency with various ambient conditions.

DOI:10.12693/APhysPolA.134.451 topics: ambient and wake turbulence intensity, flow over flat terrain, atmospheric stratification, wake propagation modeling