Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations
Islam HASHEM1, Aida A. HAFIZ2, Mohamed H. MOHAMED3()
1. Mechanical Power Engineering Department, Faculty of Engineering-Mataria, Helwan University, Cairo 11718, Egypt; State Key Laboratory of Hydroscience and Engineering, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China 2. Mechanical Power Engineering Department, Faculty of Engineering-Mataria, Helwan University, Cairo 11718, Egypt 3. Mechanical Power Engineering Department, Faculty of Engineering-Mataria, Helwan University, Cairo 11718, Egypt; Mechanical Engineering Department, College of Engineering and Islamic Architecture, Umm Al-Qura University, Makkah5555, Saudi Arabia
Wind-lens turbines (WLTs) exhibit the prospect of a higher output power and more suitability for urban areas in comparison to bare wind turbines. The wind-lens typically comprises a diffuser shroud coupled with a flange appended to the exit periphery of the shroud. Wind-lenses can boost the velocity of the incoming wind through the turbine rotor owing to the creation of a low-pressure zone downstream the flanged diffuser. In this paper, the aerodynamic performance of the wind-lens is computationally assessed using high-fidelity transient CFD simulations for shrouds with different profiles, aiming to assess the effect of change of some design parameters such as length, area ratio and flange height of the diffuser shroud on the power augmentation. The power coefficient (Cp) is calculated by solving the URANS equations with the aid of the SST k–ω model. Furthermore, comparisons with experimental data for validation are accomplished to prove that the proposed methodology could be able to precisely predict the aerodynamic behavior of the wind-lens turbine. The results affirm that wind-lens with cycloidal profile yield an augmentation of about 58% increase in power coefficient compared to bare wind turbine of the same rotor swept-area. It is also emphasized that diffusers (cycloid type) of small length could achieve a twice increase in power coefficient while maintaining large flange heights.
. [J]. Frontiers in Energy, 2022, 16(4): 661-682.
Islam HASHEM, Aida A. HAFIZ, Mohamed H. MOHAMED. Characterization of aerodynamic performance of wind-lens turbine using high-fidelity CFD simulations. Front. Energy, 2022, 16(4): 661-682.
M Inoue, A Sakurai, Y Ohya. A simple theory of wind turbine with brimmed diffuser. Turbomachinery, 2002, 30(8): 497–502 (in Japanese)
2
Y Ohya, T Karasudani. A shrouded wind turbine generating high output power with wind-lens technology. Energies, 2010, 3(4): 634–649 https://doi.org/10.3390/en3040634
3
K Abe, M Nishida, A Sakurai, et al. Experimental and numerical investigations of flow fields behind a small wind turbine with a flanged diffuser. Journal of Wind Engineering and Industrial Aerodynamics, 2005, 93(12): 951–970 https://doi.org/10.1016/j.jweia.2005.09.003
4
Y Ohya, T Karasudani, A Sakurai, et al. Development of a high-performance wind turbine equipped with a brimmed diffuser shroud. Transactions of the Japan Society for Aeronautical and Space Sciences, 2006, 49(163): 18–24 https://doi.org/10.2322/tjsass.49.18
5
K Abe, H Kihara, A Sakurai, et al. An experimental study of tip-vortex structures behind a small wind turbine with a flanged diffuser. Wind and Structures, 2006, 9(5): 413–417 https://doi.org/10.12989/was.2006.9.5.413
6
Y Ohya, T Karasudani, A Sakurai, et al. Development of a shrouded wind turbine with a flanged diffuser. Journal of Wind Engineering and Industrial Aerodynamics, 2008, 96(5): 524–539 https://doi.org/10.1016/j.jweia.2008.01.006
7
K Toshimitsu, K Nishikawa, W Haruki, et al. PIV measurements of flows around the wind turbines with a flanged-diffuser shroud. Journal of Thermal Science, 2008, 17(4): 375–380 https://doi.org/10.1007/s11630-008-0375-4
8
K Abe, Y Ohya. An investigation of flow fields around flanged diffusers using CFD. Journal of Wind Engineering and Industrial Aerodynamics, 2004, 92(3–4): 315–330 https://doi.org/10.1016/j.jweia.2003.12.003
9
S Takahashi, Y Hata, Y Ohya, et al. Behavior of the blade tip vortices of a wind turbine equipped with a brimmed-diffuser shroud. Energies, 2012, 5(12): 5229–5242 https://doi.org/10.3390/en5125229
10
Y Ohya, T Uchida, T Karasudani, et al. Numerical studies of flows around a wind turbine equipped with flanged-diffuser shroud by using an actuator-disc model. Wind Engineering, 2012, 36(4): 455–472 https://doi.org/10.1260/0309-524X.36.4.455
11
G M Lilley, W J Rainbird. A preliminary report on the design and performance of a ducted windmill. Cranfield: The College of Aeronautics, 1956
12
B L Gilbert, R A Oman, K M Foreman. Fluid dynamics of diffuser-augmented wind turbines. Journal of Energy, 1978, 2(6): 368–374 https://doi.org/10.2514/3.47988
13
B L Gilbert, K M Foreman. Experiments with a diffuser-augmented model wind turbine. Journal of Energy Resources Technology, 1983, 105(1): 46–53 https://doi.org/10.1115/1.3230875
D G Phillips, P J Richards, R G J Flay. Diffuser development for a diffuser augmented wind turbines using computational fluid dynamics. Technical Report, University of Auckland, 2005
16
D G Phillips, R G J Flay, T A Nash. Aerodynamic analysis and monitoring of the Vortec 7 diffuser-augmented wind turbine. Transactions of the Institution of Professional Engineers of New Zealand: Electrical/Mechanical/Chemical Engineering Section, 1999, 26(1): 13–19
A L Loeffler Jr, D Vanderbilt. Inviscid flow through wide-angle diffuser with actuator disk. AIAA Journal, 1978, 16(10): 1111–1112 https://doi.org/10.2514/3.7615
20
A L Loeffler Jr. Flow field analysis and performance of wind turbines employing slotted diffusers. Journal of Solar Energy Engineering, 1981, 103(1): 17–22 https://doi.org/10.1115/1.3266198
21
C G Georgalas, A D Koras. Calculations of wind-flow through thin annular augmentors of very high aspect ratio. Wind Engineering, 1987, 11(4): 225–233
22
M Hansen, N Sørensen, R G J Flay. Effect of placing a diffuser around a wind turbine. Wind Energy (Chichester, England), 2000, 3(4): 207–213 https://doi.org/10.1002/we.37
23
D Phillips. An Investigation on diffuser augmented wind turbine design. Dissertation for the Doctoral Degree. Auckland: University of Auckland, 2003
24
S J Watson, D G Infield, S J Barton, et al. Modelling of the performance of a building-mounted ducted wind turbine. Journal of Physics: Conference Series, 2007, 75: 012001 https://doi.org/10.1088/1742-6596/75/1/012001
25
A Nasution, D W Purwanto. Optimized curvature interior profile for diffuser augmented wind turbine (DAWT) to increase its energy-conversion performance. In: Proceedings of 2011 IEEE Conference on Clean Energy and Technology (CET), Kuala Lumpur, IEEE. 2011, 315–320
26
L L Gomis. Effect of diffuser augmented micro wind turbines features on device performance. Dissertation for the Master Degree. Wollongong: University of Wollongong, 2011
27
S Hjort, H Larsen. A multi-element diffuser augmented wind turbine. Energies, 2014, 7(5): 3256–3281 https://doi.org/10.3390/en7053256
28
N Oka, M Furukawa, K Yamada, et al. Aerodynamic design optimization of wind-lens turbine. In: ASME 2013 Fluids Engineering Division Summer Meeting, 2013 https://doi.org/10.1115/FEDSM2013-16569
29
J F Hu, W X Wang. Upgrading a shrouded wind turbine with a self-adaptive flanged diffuser. Energies, 2015, 8(6): 5319–5337 https://doi.org/10.3390/en8065319
30
J Liu, M Song, K Chen, et al. An optimization methodology for wind lens profile using computational fluid dynamics simulation. Energy, 2016, 109: 602–611 https://doi.org/10.1016/j.energy.2016.04.131
J Thé, H Yu. A critical review on the simulations of wind turbine aerodynamics focusing on hybrid RANS-LES methods. Energy, 2017, 138: 257–289 https://doi.org/10.1016/j.energy.2017.07.028
33
F R Menter. Two-equation eddy-viscosity turbulence models for engineering applications. AIAA Journal, 1994, 32(8): 1598–1605 https://doi.org/10.2514/3.12149
34
H Yu, J Thé. Validation and optimization of SST k--w turbulence model for pollutant dispersion within a building array. Atmospheric Environment, 2016, 145: 225–238 https://doi.org/10.1016/j.atmosenv.2016.09.043
35
H Yu, J Thé. Simulation of gaseous pollutant dispersion around an isolated building using the k–w SST (shear stress transport) turbulence model. Journal of the Air & Waste Management Association, 2017, 67(5): 517–536 https://doi.org/10.1080/10962247.2016.1232667
36
L Daróczy, G Janiga, K Petrasch, et al. Comparative analysis of turbulence models for the aerodynamic simulation of H-Darrieus rotors. Energy, 2015, 90(Part 1): 680–690 https://doi.org/10.1016/j.energy.2015.07.102
37
M Hansen, J Sørensen, J Michelsen, et al. A global Navier-Stokes rotor prediction model. In: Proceedings of 35th Aerospace Sciences Meeting and Exhibit, Reno, NV, USA. 1997, 0970
38
N Sørensen, M Hansen. Rotor performance predictions using a Navier-Stokes method. In: Proceedings of 1998 ASME Wind Energy Symposium, Reno, NV, USA. 1998, 0025
39
C Bak, P Fuglsang, N N Sørensen, et al. Airfoil Characteristics for Wind Turbines. Risø. Nation Laboratory, Roskilde, 1999
40
K Mansour, P Meskinkhoda. Computational analysis of flow fields around flanged diffusers. Journal of Wind Engineering and Industrial Aerodynamics, 2014, 124: 109–120 https://doi.org/10.1016/j.jweia.2013.10.012
41
A C Aranake, V K Lakshminarayan, K Duraisamy. Computational analysis of shrouded wind turbine configurations using a 3-dimensional RANS solver. Renewable Energy, 2015, 75: 818–832 https://doi.org/10.1016/j.renene.2014.10.049
42
N W Harvey, K Ramsden. A computational study of a novel turbine rotor partial shroud. Journal of Turbomachinery, 2001, 123(3): 534–543 https://doi.org/10.1115/1.1370166
43
A M El-Zahaby, A E Kabeel, S S Elsayed, et al. CFD analysis of flow fields for shrouded wind turbine’s diffuser model with different flange angles. Alexandria Engineering Journal, 2017, 56(1): 171–179 https://doi.org/10.1016/j.aej.2016.08.036
B Kim, J Kim, K Kikuyama, et al. 3-D numerical predictions of horizontal axis wind turbine power characteristics of the scaled Delft University T40/500 Model. In: Proceedings of the 5th JSME-KSME Fluids Engineering Conference, Nagoya, Japan. 2002, 17–21
46
M O L Hansen, J Johansen. Tip studies using CFD and comparison with tip loss models. Wind Energy (Chichester, England), 2004, 7(4): 343–356 https://doi.org/10.1002/we.126
P Laursen, P Enevoldsen, S Hjort. 3D CFD quantification of the performance of a multi-megawatt wind. Journal of Physics: Conference Series, 2007, 75: 012007 https://doi.org/10.1088/1742-6596/75/1/012007
49
R S Amano, R J Malloy. CFD analysis on aerodynamic design optimization of wind turbine rotor blades. World Academy of Science, Engineering and Technology, 2009, 60: 71–75
I Hashem, M H Mohamed, A A Hafiz. Numerical prediction of aero-acoustics emitted from shrouded wind turbines. In: Proceedings of ICFD12: 12th International Conference of Fluid Dynamics, Le Méridien Pyramids Hotel, Egypt. 2016, 5008
52
I Hashem, M H Mohamed, A A Hafiz. Numerical investigation of small-scale shrouded wind turbine with a brimmed diffuser. In: Proceedings of ICFD12: 12th International Conference of Fluid Dynamics, Le Méridien Pyramids Hotel, Egypt. 2016, 5003
53
A Dessoky, G Bangga, T Lutz, et al. Aerodynamic and aeroacoustic performance assessment of H-rotor Darrieus VAWT equipped with wind-lens technology. Energy, 2019, 175: 76–97 https://doi.org/10.1016/j.energy.2019.03.066
54
H Matsumiya, T Kogaki, N Takahashi, et al. Development and experimental verification of the new MEL airfoil series for wind turbines. In: Proceedings of Japan Wind Energy Symposium, 2000, 22: 92–95 (in Japanese)
55
T A Khamlaj, M Rumpfkeil. Optimization study of shrouded horizontal axis wind turbine. In: Proceedings of the 2018 Wind Energy Symposium, Kissimmee, Florida. 2018, 0996
56
I Hashem, H S Abdel Hameed, M H Mohamed. An axial turbine in an innovative oscillating water column (OWC) device for sea-wave energy conversion. Ocean Engineering, 2018, 164: 536–562 https://doi.org/10.1016/j.oceaneng.2018.06.067
S Kody, E Alpman, B Yilmaz. Computational studies of horizontal axis wind turbines using advanced turbulence models. Fen Bilimleri Dergisi, 2014, 26(2): 36–46 https://doi.org/10.7240/mufbed.00513
