Wake affected offshore tower and foundation loads

Research output: Book/ReportReport – Annual report year: 2016Researchpeer-review

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Wake affected offshore tower and foundation loads. / Larsen, Gunner Chr.; Larsen, Torben J.; Pedersen, Mads Mølgaard; Enevoldsen, Karen; Aagaard Madsen , Helge.

DTU Wind Energy, 2016. 140 p. (DTU Wind Energy E; No. 131).

Research output: Book/ReportReport – Annual report year: 2016Researchpeer-review

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Larsen, Gunner Chr. et al. Wake affected offshore tower and foundation loads DTU Wind Energy. 2016. (DTU Wind Energy E; Journal number 131).

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Bibtex

@book{5a2ff9baa3f04aa8b6c528b63c94ddde,
title = "Wake affected offshore tower and foundation loads",
abstract = "Based on the recorded data material basic mechanisms driving the increased loading experienced by WT’s operating in offshore wind farm conditions has been identified, characterized and modeled, and in general a very good agreement between predictions and measurements is obtained. However, for single wake situations the predictions seem to under-predict loading in the above rated wind speed regime. The, a priory, conjectured load peak in full wake loading cases, for a certain downstream spacing, has been identified in the simulations. As for the measurements, the considerable scatter in these prevents a firm conclusion on this issue. However, it can be concluded: 1) that tower bottom bending fatigue equivalent moments seem to level out in the range between 6D and 9D and decrease at longer downstream distances; and 2) that tower top yaw fatigue equivalent moments seem to level out in the range between 5D and 7D and decrease at longer downstream distances. Finally, generic WF studies combined with analyses of the Nysted II layout has revealed that, from a load perspective, it is recommended to avoid straight line topology layouts, at least if these lines is oriented along predominant wind directions.",
author = "Larsen, {Gunner Chr.} and Larsen, {Torben J.} and Pedersen, {Mads M{\o}lgaard} and Karen Enevoldsen and {Aagaard Madsen}, Helge",
year = "2016",
language = "English",
publisher = "DTU Wind Energy",
address = "Denmark",

}

RIS

TY - RPRT

T1 - Wake affected offshore tower and foundation loads

AU - Larsen, Gunner Chr.

AU - Larsen, Torben J.

AU - Pedersen, Mads Mølgaard

AU - Enevoldsen, Karen

AU - Aagaard Madsen , Helge

PY - 2016

Y1 - 2016

N2 - Based on the recorded data material basic mechanisms driving the increased loading experienced by WT’s operating in offshore wind farm conditions has been identified, characterized and modeled, and in general a very good agreement between predictions and measurements is obtained. However, for single wake situations the predictions seem to under-predict loading in the above rated wind speed regime. The, a priory, conjectured load peak in full wake loading cases, for a certain downstream spacing, has been identified in the simulations. As for the measurements, the considerable scatter in these prevents a firm conclusion on this issue. However, it can be concluded: 1) that tower bottom bending fatigue equivalent moments seem to level out in the range between 6D and 9D and decrease at longer downstream distances; and 2) that tower top yaw fatigue equivalent moments seem to level out in the range between 5D and 7D and decrease at longer downstream distances. Finally, generic WF studies combined with analyses of the Nysted II layout has revealed that, from a load perspective, it is recommended to avoid straight line topology layouts, at least if these lines is oriented along predominant wind directions.

AB - Based on the recorded data material basic mechanisms driving the increased loading experienced by WT’s operating in offshore wind farm conditions has been identified, characterized and modeled, and in general a very good agreement between predictions and measurements is obtained. However, for single wake situations the predictions seem to under-predict loading in the above rated wind speed regime. The, a priory, conjectured load peak in full wake loading cases, for a certain downstream spacing, has been identified in the simulations. As for the measurements, the considerable scatter in these prevents a firm conclusion on this issue. However, it can be concluded: 1) that tower bottom bending fatigue equivalent moments seem to level out in the range between 6D and 9D and decrease at longer downstream distances; and 2) that tower top yaw fatigue equivalent moments seem to level out in the range between 5D and 7D and decrease at longer downstream distances. Finally, generic WF studies combined with analyses of the Nysted II layout has revealed that, from a load perspective, it is recommended to avoid straight line topology layouts, at least if these lines is oriented along predominant wind directions.

M3 - Report

BT - Wake affected offshore tower and foundation loads

PB - DTU Wind Energy

ER -