Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects
A dynamic stall model for tower shadow effects is developed for downwind turbines. Although Munduate’s model shows good agreement with a 1.0 m wind tunnel test model, two problems exist: (1) it does not express load increase before the entrance of the tower wake, and (2) it uses the empirical tower...
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Online Access: | https://www.mdpi.com/1996-1073/13/19/5237 |
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doaj-e62a8e73f6b34a4eb96c46235f5897b92020-11-25T03:50:54ZengMDPI AGEnergies1996-10732020-10-01135237523710.3390/en13195237Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale EffectsShigeo Yoshida0Research Institute for Applied Mechanics, Kyushu University, 6-1 Kasugakoen, Kasuga, Fukuoka 816-8580, JapanA dynamic stall model for tower shadow effects is developed for downwind turbines. Although Munduate’s model shows good agreement with a 1.0 m wind tunnel test model, two problems exist: (1) it does not express load increase before the entrance of the tower wake, and (2) it uses the empirical tower wake model to determine the wind speed profile behind the tower. The present research solves these problems by combining Moriarty’s tower wake model and the entrance condition of the tower wake. Moriarty’s model does not require any empirical parameter other than tower drag coefficient and it expresses positive wind speed around the tower also. Positive wind speed change is also allowed as the tower wake entrance condition in addition to the negative change observed in the previous model. It demonstrates better agreement with a wind tunnel test and contributes to the accuracy of the fatigue load, as it expresses a slight increase in load around the entrance of the tower wake. Furthermore, the scale effects are also evaluated; lift deviation becomes smaller as the scale increases, i.e., lower rotor speed.https://www.mdpi.com/1996-1073/13/19/5237blade element and momentum methoddownwind rotortower shadow |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Shigeo Yoshida |
spellingShingle |
Shigeo Yoshida Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects Energies blade element and momentum method downwind rotor tower shadow |
author_facet |
Shigeo Yoshida |
author_sort |
Shigeo Yoshida |
title |
Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects |
title_short |
Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects |
title_full |
Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects |
title_fullStr |
Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects |
title_full_unstemmed |
Dynamic Stall Model for Tower Shadow Effects on Downwind Turbines and Its Scale Effects |
title_sort |
dynamic stall model for tower shadow effects on downwind turbines and its scale effects |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-10-01 |
description |
A dynamic stall model for tower shadow effects is developed for downwind turbines. Although Munduate’s model shows good agreement with a 1.0 m wind tunnel test model, two problems exist: (1) it does not express load increase before the entrance of the tower wake, and (2) it uses the empirical tower wake model to determine the wind speed profile behind the tower. The present research solves these problems by combining Moriarty’s tower wake model and the entrance condition of the tower wake. Moriarty’s model does not require any empirical parameter other than tower drag coefficient and it expresses positive wind speed around the tower also. Positive wind speed change is also allowed as the tower wake entrance condition in addition to the negative change observed in the previous model. It demonstrates better agreement with a wind tunnel test and contributes to the accuracy of the fatigue load, as it expresses a slight increase in load around the entrance of the tower wake. Furthermore, the scale effects are also evaluated; lift deviation becomes smaller as the scale increases, i.e., lower rotor speed. |
topic |
blade element and momentum method downwind rotor tower shadow |
url |
https://www.mdpi.com/1996-1073/13/19/5237 |
work_keys_str_mv |
AT shigeoyoshida dynamicstallmodelfortowershadoweffectsondownwindturbinesanditsscaleeffects |
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1724489938695618560 |