Abstract
As downwind turbines garner increasing research interest, nacelle blockage becomes an important consideration. This paper examines nacelle blockage effects under a variety of Reynolds numbers, turbulence intensities, and nacelle geometries and proposes a computationally inexpensive nacelle blockage engineering model. Results show minimal nacelle blockage impacts on rotor loading and performance, except for tall (low-aspect-ratio) nacelles, which can cause an increase in rotor Cp of up to 0.6%. In all cases, nacelle blockage increases rotor loading and performance metrics, however little. Finally, (more expensive) geometry-resolved and (less expensive) body-force computational fluid dynamics modeling techniques are compared, and body-force models are found to need improvement to adequately model nacelle blockage.
Original language | American English |
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Article number | Article No. 062062 |
Number of pages | 11 |
Journal | Journal of Physics: Conference Series |
Volume | 1618 |
Issue number | 6 |
DOIs | |
State | Published - 22 Sep 2020 |
Event | Science of Making Torque from Wind 2020, TORQUE 2020 - Virtual, Online, Netherlands Duration: 28 Sep 2020 → 2 Oct 2020 |
Bibliographical note
Publisher Copyright:© Published under licence by IOP Publishing Ltd.
NREL Publication Number
- NREL/JA-5000-76879
Keywords
- CFD
- downwind
- nacelle blockage
- wind energy