نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشکده ی مهندسی مکانیک ، دانشگاه تربیت مدرس
2 دانشکده ی مهندسی مکانیک، دانشگاه تربیت مدرس
3 دانشکده ی مهندسی خودرو، دانشگاه علم و صنعت
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In this paper performance of vertical-axial wind turbine has been studied based
on 5 different flow control techniques. The active methods selected here are
suction and blowing and the passive methods are composed of using riblet,
cavity and porous media, which the latter one is a new method. The benchmark
turbine selected here is Darrieus type and the performance parameter is considered as power coefficient of the turbine. The geometry, location and
depth of the actuators are assumed to be approximately equal in different
methods aiming the better comparison. Two-dimensional CFD and flow simulation was carried out in Star-ccm+ software. The governing equations are unsteady Navier-Stokes equations and turbulence model is selected k-\u{03b5}. The numerical result of the original wind turbine has been validated against
experimental data. Then for each control method, numerical solution has been
performed and being evaluated. The results show that the power coefficient or
efficiency could be improved as much as the control method would reduce the
wake region. The results also show that the blowing and suction control methods
with about 6\% improvement for TSR 1.7 and 2.64 have the better performance
among all other methods. Using porous media as a new control method, improves
power by about 1\% in TSR 1.7. Considering the advantages in noise reduction,
this new technique may be further investigated. In this paper also parametric
study of each control methods have been performed. The change in power
coefficient depends on both TSR and actuator intensity. Based on the numerical
simulations it is recommended that a hybrid layout consisting active and
passive flow control method applied over turbine blades.
کلیدواژهها [English]
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