Pengaruh Desain Interior Diffuser Terhadap Peningkatan Performa Diffuser Augmented Wind Turbine (DAWT)
DOI:
https://doi.org/10.31963/intek.v5i2.573Abstract
The main objective of numerical simulation in thisstudies is to determine the effect of diffuser’s interior design onincreasing the diffuser augmented wind turbine (DAWT)performance by observing wind velocity increment. Numericalstudies were carried out using the computational Fluid Dynamics(CFD) method through a two-dimensional steady approach withAnsys Fluent 18.2 and Ansys Workbench 18.2 software. Thepresent studies spesifically investigate the shapes of diffuser,namely flat diffuser and curved diffuser. The studies demonstratethat the curved diffuser generates stronger increment of the windvelocity than flat diffuser (at centreline), which 1.842 times thefreestream velocity, while the flat diffuser is only able to increseup to 1.742 times the freestream velocity. The curved diffusershows the highest increment of the average wind velocity alongdiffuser with the greatest increment of 78.66 % and the flatdiffuser is only able to provide average wind velocity incrementup to 44.81%. The curved interor of diffuser is able to enlarge thewake area, so the effect of the suction flow entering the diffuserbecomes stronger. Therefore, curved diffuser is better to provideDAWT performance improvements.References
Syahrul, “Prospek pemanfaatan energi angin sebagai energi
alternatif di daerah pedesaan,†Media Elektrik, vol.3 no.2,
hal.140-144, 2008.
Y. Ohya, T. Karasudani, A. Sakurai, K. Abe, and M. Inoue,
“Development of s shrouded wind turbine with a flanged
diffuser,†Journal of wind engineering and industrial
aerodynamics, 96, pp. 524-539, 2008.
D.W. Purwanto dan A.M.T. Nasution, “Interior lengkung
diffuser untuk peningkatan performansi diffuser augmented
wind turbine (DAWT),†Prosiding seminar nasional energi
terbarukan Indonesia I, 2010.
M. Lipian, M. Karczewski, and K. Olasek, “Sensitivity study
of diffuser angle and brim height parameters for the design of
kW diffuser augmented wind turbine,†Open engineering, 5,
pp. 280-286, 2015.
A.T.H. Wibowo, R.A. Wahyuono, dan G. Nugroho, “Studi
numerik pengaruh geometri dan desain diffuser untuk
peningkatan kinerja DAWT (diffuser augmented wind
turbine),†Jurnal Teknik Mesin, vol. 14 no.2, hal.90-96, ISSN
-9867, 2013.
J. Hu, W. Wang, “Upgrading a shrouded wind turbine with a
self adaptive flanged diffuser,†Energies, 8, pp.5319-5337,
K. Abe and Y. Ohya, “An investigation of flow fields around
flanged diffusers using CFD,†Journal of wind engineering
and industrial aerodynamics, 92, pp.315-330, 2004.
F.R. Menter, “Two-equation eddy-viscosity turbulence
models for engineering applications,†AIAA journal, 32(8),
pp.1598-1605, 1994.
B.E. Launder, D.B. Spalding, “Mathematical models of
turbulence,†Academic press, 1972.
D.C. Wilcox, “Turbulance modelling fo CFDâ€. DCW
Industries, 1993.
G. Bangga and H. Sasongko, “Dynamic stall prediction of a
pitching airfoil using an adjusted two-equation URANS
turbulence model,†Journal of Applied Fluid Mechanics,
(1), pp.1-10, 2017.
G. Bangga, T. Kusumadewi, G. Hutomo, A. Sabila, T.
Syawitri, H. Setiadi, M. Faisal, R. Wiranegara, Y. Hendranata,
D. Lastomo, L. Putra, “Improving a two-equation eddyviscosity
turbulence model to predict the aerodynamic
performance of thick wind turbine airfoils,†Journal of
Physics: Conference Series, 974(1), 012019, 2018.
A.L. Pape, and J. Lecanu, “3D Navier–Stokes computations of
a stall regulated wind turbine,†Wind Energy, 7(4), pp.309-
, 2004.
N.N. Sørensen, J.A. Michelsen, S. Schreck, “Navier–Stokes
predictions of the NREL phase VI rotor in the NASA Ames
ft × 120 ft wind tunnel,†Wind Energy, 5(2-3), pp.151-169,
P. Weihing, J. Letzgus, G. Bangga, T. Lutz, and E. Krämer,
“Hybrid RANS/LES Capabilities of the Flow Solver
FLOWer—Application to Flow Around Wind Turbines,†In
Symposium on Hybrid RANS-LES Methods Springer, Cham,
pp.369-380, 2016.
E. Jost, A. Fischer, G. Bangga, T. Lutz, E. Krämer, “An
investigation of unsteady 3-D effects on trailing edge flaps,â€
Wind Energy Science, 2(1), pp.241-256, 2017.
Y. Klistafani, “Studi numerik steady RANS aliran fluida di
dalam asymmetric diffuser,†Journal INTEK, vol. 4 (1),
pp.20-26, April 2017.
Y. Klistafani, “Karakteristik aliran fluida di dalam asymmetric
diffuser dengan penambahan vortex generator,†Journal
INTEK, vol. 5 (1), pp.21-26, 2018.
Y. Klistafani, M.I. Mukhsen, and G. Bangga “Assessment of
Various Diffuser Structures to Improve the PowerProduction
of a Wind Turbine Rotor,†Technische Mechanik, vol. 38,
pp.256-266, 2018.
