Abstract
The centrifugal pumping, also known as rotational augmentation, is a 3D phenomenon which is of utmost importance in the aerodynamics of HAWTs. A clear physical explanation about the rise and development of this phenomenon is still missing in the scientific literature. Indeed, several empirical approaches have been proposed for taking into account the rotational effects inside 1D design codes. However, at the state, these approaches lead to results, which are quite different amongst each other. In the present paper the authors propose a thorough analysis of the rotational augmentation in an experimental micro HAWT. For this purpose, previously validated CFD 3D models were used. These models were developed using ANSYS Fluent solver with a calibrated RANS transition turbulence model. The post-processing analysis, presented in this paper, demonstrates that the strong increase of the aerodynamic forces is mainly due to the presence of a strong helical vortex which develops in the inner part of the blade. This vortex depressurizes the entire separated layer and it is found to be due to the combined effect of Coriolis and centrifugal forces along with the span-wise pressure gradient. Moreover, the essential contribution of the radial component of the Coriolis force was evidenced in contrast with the fact that this component is usually neglected.
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References
Elgammi M, Sant T (2017) A new stall delay algorithm for predicting the aerodynamics loads on wind turbine blades for axial and yawed conditions. Wind Energy 20(9):1645–1663. https://doi.org/10.1002/we.2115
Du Z, Selig MS (2000) The effect of rotation on the boundary layer of a wind turbine blade. Renew Energy 20(2000):167–181. https://doi.org/10.1016/S0960-1481(99)00109-3
Lanzafame R, Mauro S, Messina M (2015) Evaluation of the radial flow effects on micro HAWTs through the use of a transition CFD 3D model—part I: state of the art and numerical model review. Energy Procedia 82(C):156–163. https://doi.org/10.1016/j.egypro.2015.12.011
Snel H, Van Holten T (1994) Review of recent aerodynamic research on wind turbines with relevance to rotorcraft, data and riddles on dynamic inflow, flowfield of yawed rotors and rotating 3-D stall. In: Proceedings of the 20th European rotorcraft forum. Amsterdam, 4–7 Oct 1994
Lindenburg C (2004) Modelling of rotational augmentation based on engineering considerations and measurements. ECN-RX–04-131 EWEC, London
Hu D, Hua O, Hu Z (2006) A study on stall-delay for horizontal axis wind turbine. Renew Energy 31:821–836. https://doi.org/10.1016/j.renene.2005.05.002
Lindenburg C. Investigation into rotor blade aerodynamics: analysis of the stationary measurements on the UAE phase-VI rotor in the NASA-Ames wind tunnel. ECN-C–03-025
Herraez I, Stoevesandt B, Peinke J (2014) Insight into rotational effects on a wind turbine blade using Navier-Stokes computations. Energies 7:6798–6822. https://doi.org/10.3390/en7106798
Früh WG, Creech ACW (2015) A criterion for rotational augmentation based on a boundary-layer analysis. Renew Energy Power Qual J (RE&PQJ). ISSN 2172-038X, No. 13
Breton SP, Coton FN, Moe G (2008) A study on rotational effects and different stall delay models using a prescribed wake vortex scheme and NREL phase VI experiment data. Wind Energy 11(5):459–482. https://doi.org/10.1002/we.269
Karimipanah MT, Olsson E (1993) Calculation of three-dimensional boundary layers on rotor blades using integral methods. J Turbomach 115(2):342–353. https://doi.org/10.1115/1.2929240
Schreck S, Robinson M (2002) Rotational augmentation of horizontal axis wind turbine blade aerodynamic response. Wind Energy 5:133–150. https://doi.org/10.1002/we.68
Johansen J, Sørensen NN (2004) Aerofoil characteristics from 3D CFD rotor computations. Wind Energy 7:283–294. https://doi.org/10.1002/we.127
Carangiu CE, Sørensen JN, Cambuli F, Mandas N (2007) CFD–RANS analysis of the rotational effects on the boundary layer of wind turbine blades. J. Phys. Conf. Ser. 75(2007). https://doi.org/10.1088/1742-6596/75/1/012031
Song Y, Perot JB (2015) CFD simulation of the NREL phase VI rotor. Wind Eng 39(3):299–309. https://doi.org/10.1260/0309-524x.39.3.299
Lanzafame R, Mauro S, Messina M (2015) Evaluation of the radial flow effects on micro HAWTs through the use of a transition CFD 3D model—part II: postprocessing and comparison of the results. Energy Procedia 82(C):164–171. https://doi.org/10.1016/j.egypro.2015.12.013
Lanzafame R, Mauro S, Messina M (2016) Numerical and experimental analysis of micro HAWTs designed for wind tunnel applications. Int J Energy Environ Eng 7(2):199–210. https://doi.org/10.1007/s40095-016-0202-8 Springer
Lanzafame R, Mauro S, Messina M (2013) Wind turbine CFD modeling using a correlation-based transitional model. Renew Energy 52:31–39 http://dx.doi.org/10.1016/j.renene.2012.10.007 (Elsevier)
Langtry RB, Menter FR, Likki SR, Suzen YB, Huang PG, Völker S (2004) A correlation based transition model using local variables part I: model formulation. ASME J Turbomach 128(3):413–422. https://doi.org/10.1115/1.2184352
Langtry RB, Menter FR, Likki SR, Suzen YB, Huang PG, Völker S (2004) A correlation based transition model using local variables part II: test cases and industrial applications. ASME J Turbomach 128(3):423–434. https://doi.org/10.1115/1.2184353
Mauro S, Lanzafame R, Messina M, Pirrello D (2017) Transition turbulence model calibration for wind turbine airfoil characterization through the use of a micro-genetic algorithm. Int J Energy Environ Eng 8:359–374. https://doi.org/10.1007/s40095-017-0248-2
Mauro S, Lanzafame R, Messina M (2017) An insight into the rotational augmentation on HAWTs by means of CFD simulations—part II: post-processing and force analysis. Int J Appl Eng Res 12(21):10505–10529. ISSN 0973-4562
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Mauro, S., Lanzafame, R., Messina, M., Brusca, S. (2019). A Detailed Analysis of the Centrifugal Pumping Phenomenon in HAWTs Through the Use of CFD Models. In: Battisti, L. (eds) Wind Energy Exploitation in Urban Environment. TUrbWind 2018. Research Topics in Wind Energy, vol 8. Springer, Cham. https://doi.org/10.1007/978-3-030-13531-7_8
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