تقييم تأثير الرياح غير المستقرة على أيروديناميك وأداء العنفات الريحية شاقولية المحور

الموضوعات

علوم تطبيقية وتكنولوجية

روابط وملفات

التعريف والنوع

رقم الوثيقة

0827a55c-41c0-4f91-bac8-e48fb63f21d3

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل دكتوراة

نوع الملف

pdf text

أسماء الملفات

1957493_1.pdf

بيانات النشر

ترجمة العنوان

Evaluating the Influence of Unsteady Wind on the Performance and Aerodynamics of Vertical Axis Wind Turbines (VAWT)

ألقاب المؤلفين

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اللغة

Arabic

المصدر والدورية

اسم المصدر

تقييم تأثير الرياح غير المستقرة على أيروديناميك وأداء العنفات الريحية شاقولية المحور

المحتوى والصفحات

عدد الصفحات

0

ترجمة الملخص

This researchpresents an experimental andnumericalstudy of the influence ofunsteady wind on the performance and aerodynamics of vertical axis wind turbines (VAWT).The experiments were performed byusing two methods. The first was to place the turbine behind the low-speed wind tunnel situated at the University of Aleppo –Faculty of Mechanical Engineering, where the velocity changes have been measured behind the tunnel and at several locations, and the frequency value and the turbulence intensity of the air coming out of the tunnel have been determined. The second method was to place the turbine at the exit of an industrial fan that had installed and, at its outlet a channel has been put to collect the air. Then, the turbulence intensity was controlled and the frequency value was changed by a turbulence generator, which is a plate fixed vertically and at different angles at the outlet of the channel. Knowing the velocity changes at the adopted location where the turbine was fixed, the frequency and Turbulence Intensity have been calculated. The numerical simulation has beenper formed by using ANSYS fluent 14, and that, by selecting the turbulence modelK-ω SST and adopting the same conditions approved by the experimental data.The numerical results showed after comparing the Cp-λ schemes that, in case of adopting the unsteady flow the power coefficient decreased by 8.07% for λ = 1 and 40.037% for λ=2and 16.15% at λ=3. The experimental results also showed at the low rates of the Tip speed ratio (less than 1.2) the frequency influence was negative, ie, the power coefficient was reduced by increasing the frequency. Also, the turbulence intensity influence was negative, so that in increasing the turbulence intensity, the power coefficient was reduced, and at the high values of turbulence intensity (30%,62%), the turbine can't works.Percentage of error between numerical and experimental study in the case of the adoption of unsteady of flow 11.37% and in the adoption of a steady flow in the numerical study 18.53%.

كلمات الباحثين

ANSYS fluent 14, Turbulence Intensity, unsteady wind, VAWT, Wind Frequency

إشراف وإعداد

الإشراف

إجلال حصري , محمود الحسين

الإعداد

سمية الراشد

الاقتباسات الببليوغرافية