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Register a new userTHE IMPACT OF BOUNDARY LAYER SUCTION ON THE ENERGY PERFORMANCE FOR SMALL WIND TURBINE
تأثير امتصاص الطبقة الحدية في الأداء الطاقوي لعنفة ريحية صغيرة
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تناول هذا البحث دراسة تأثير طريقة الامتصاص كطريقة من طرق التحكم بالطبقة الحدية من أجل تجنب أو على الأقل تأخير حدوث انفصام الطبقة الحدية و توضيح فعالية هذه الطريقة في تحسين الأداء الأيروديناميكي للسطوح الانسايبية لريشة العنفة الريحية المدروسة و بالتالي إمكانية الحصول على خرج طاقوي كهربائي أفضل للعنفة الريحية أي تحسّن الأداء الكامل للعنفات الريحية و الحصول على تصميم أفضل.
This study treat the effect of the Suction method as a way of the boundary layer controlling in order to avoid or at least delay the boundary layer separation and to explain the effectiveness of this method in improving the aerodynamic performance of the Airfoils of the studied wind turbine blade and thus the possibility of obtaining better electrical output of the wind turbine, that is performance improving of wind turbines and obtains a better design.
References used
WARSI, A 1999 - Fluid Dynamics: Theoretical and Computational Approaches. London Ltd
FUGLSANG, P 1999 - Airfoil Characteristics for Wind Turbines. Technical University of Denmark
HOUGHTON, E 2007 - Aerodynamics for Engineering Students. John Wiley & Sons, Ltd
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This research shows that the design of wind turbine blade for the
best production of energy produces a turbine with a problem of
start-up.
The study focused on ways to improve the process of the small
wind turbine start-up at the low wind speed w
ith the stability of
the pitch blade angle, and study the behavior of the turbine
during the stage of angular acceleration after the start-up until
the turbine reaches the speed of rotation that enable it to produce
the energy.
إقلاع العنفة الريحية
العزم الآيروديناميكي
عزم القصور الذاتي
الفترة الزمنية اللازمة للإقلاع
سرعة الإقلاع
سرعة بداية توليد الطاقة
سرعة دوران العنفة الريحية
Wind Turbine Startup
Aerodynamic Torque
Moment of inertia
Starting Period
Startup Wind Speed
Cut-in Wind Speed
Wind Turbine Rotation Speed
المزيد..
Our research includes the transmission mechanism of the wind turbine and the calculation of losses, such as loss of mechanical ventilation and friction loss and the loss of lubrication between the gear teeth design. Aims and access to high reliabili
ty work and thus obtain high efficiency and taking advantage of electronic programs, We observed that each type of previous losses have an impact on the overall loss of Gearbox, Depending on the working conditions, For example, at low speeds, loss of friction between the teeth is a great percentage of the total loss, And thus controls the overall efficiency of the transport system, while at high speeds noticed this low percentage of loss, while the loss of lubrication and ventilation rate rose.
The aim of this paper is to investigate the overlap between lower atmospheric boundary layer and real wind turbine wake which installed not far from ground surface, Here we adopted rotating actuator-disk model (RADM) as a complex model of 3D actuator
-disk model, virtual blade modeling (VBM) and tip loss correction, in order to get more reliability and satisfied result.
Wind turbines have grown significantly in size over the last years and, it generally placed in an atmospheric boundary layer, then the assumption of uniform wind velocity cannot be valid.
The lower part of atmospheric boundary layer has a high level of turbulence intensity and great velocity gradients, then when wind turbine placed in these conditions, a high rate of fluctuation will occur subsequently power losses in wind farms, and change wake turbulence character which affects the flow-induced dynamic loads on downwind turbines.
reliance on new and renewable sources of energy has grown in order to obtain
electric power without the use of traditional fossil fuel sources. And thus solve
the problems of the global energy crisis and also maintain a clean environment,
through
the fight against the dangers of global warming and its negative results
Wind power is considered as one of the most important of these alternative
energies.
We will work in this research in order to be able to control wind turbine with
variable speed through pitch angle control in order to organize power and
control the rotational speed in order to make the power ideal.
Where we will be using a fuzzy controller to control pitch angle instead of the
traditional controllers, which is expected to improve system response and
provide ease in the application and modification and reduction in the cost.
By reference study we came to the result showing that most previous studies in
advanced wind energy systems have addressed to control wind turbine using
conventional controllers from PI or PID type. Show we have the problem of the
need to know the exact mathematical model of the system. Where traditional
controllers of wind turbines that operate at variable speed are based on
mathematical models which may be complex and non-linear and neglect often
physical phenomena, for example, magnetic saturation which leads to
complexity in the calculation and unexpected performance of the driven system.
The proposed research aims to provide a complete study through modeling and
simulation using the Matlab about the use of fuzzy controller to control the
wind turbine where traditional controllers of type PI will be designed to control
the pitch angle and to control the rotational speed and fuzzy PI controllers to
control the pitch angle. Results will be get and discussed and conclusion will be
extracted from them.
Research Results showed that the fuzzy control improves transient state
behavior, but the steady-state behavior is better controlled when we use PI
controller. So and based on the result we got, the PI controller can't be replaced
actually with the fuzzy controller.
It is the automatic control engineering knowledge forum, as it
should monitor and control the variables that interact in all
industrial processes to perform functions equipment installations
constructed for her. The automatic control system techno
logy has a
big role in easing the burden of daily life, and make them more
luxury. automatic control applications in most appliances, such as:
air conditioning and stoves, washing machines, etc.Automated
control concepts has been used in various areas of knowledge such
as biology, economics, sociology, medicine and education .
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