Investigation of Offshore Wind Turbine Structure Deflection Using Experimental Work, Numerical, and Theoretical Approach

Ali, Hayder M.; Alwan, Hassan M.; Al-Esbe, Israa; V, Kochneva O.

doi:10.30684/etj.2022.133645.1199

	Investigation of Offshore Wind Turbine Structure Deflection Using Experimental Work, Numerical, and Theoretical Approach
Engineering and Technology Journal
Article 15, Volume 41, Issue 1, January 2023, Pages 159-175 PDF (1.04 M)
Document Type: Research Paper
DOI: 10.30684/etj.2022.133645.1199
Authors
Hayder M. Ali^* ¹; Hassan M. Alwan²; Israa Al-Esbe¹; Kochneva O. V³
¹Mechanical Engineering Department, University of Technology, Baghdad, Iraq
²University of Technology, Mechanical Engineering Department, Baghdad, Iraq,
³Peter the Great Saint Petersburg Polytechnic University, Russian Federation.
Abstract
Electrical energy from offshore wind turbines is an important source of clean, renewable energy production. One of the reasons for the low efficiency of wind turbines is the change in the flow angle of attack, denoted by the symbol (α), as a result of the deflection of the structure. The study aims to know the values of the maximum deflection of the proposed structure under the environmental conditions of the Arabian Gulf water area. Our research adopted a novel approach to extracting results; the characteristics of sea waves were extracted from the experimental work after fixing five sea waves, knowing the displacement of the top of the structure, and using the numerical approach in the ANSYS-Fluent program to know the average wind and wave forces. Two simulations were performed. The first included the five cases of sea wave characteristics without rotating wind turbine blades. The second was for the fifth case only with the wind turbine blades rotating at a speed of (20.5 rpm), assuming that the structure was exposed to a constant wind speed (12 m/s) for the two simulations. The study also included obtaining the maximum deflection value of the structure. Then, the equations of the theoretical approach were developed based on the Euler-Bernoulli bending moment equation, and the forces extracted from the simulations were entered into the theoretical equations to extract the maximum deflection values of the structure. Reading the experimental work resulted in the highest displacement of the top of the structure in the fifth case (0.178 m). The result of the second simulation had the highest value of the structure deflection (0.201 m). In comparison, its value came in the theoretical approach (0.160 m), which adopted the forces of the second simulation.
Highlights
One of the reasons for the low efficiency of offshore wind turbines in generating electricity is due to the deflection of the turbine support structure, due to the structure's exposure to the combined dynamic loads of the wind and seawater wave. Thus, knowing the extent to which the proposed structure of the study succeeds or fails.
Keywords
Monopile; Offshore wind turbine (OWT); deflection; Computational Fluid Dynamics (CFD); ANSYS-Fluent

References
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