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ساختارهای آشفتگی جریان در ناحیه دنباله یک توربین باد به روش شبیهسازی گردابههای بزرگ | ||
| نشریه مهندسی مکانیک امیرکبیر | ||
| مقاله 3، دوره 51، شماره 2، خرداد و تیر 1398، صفحه 261-280 اصل مقاله (3.37 M) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22060/mej.2017.12740.5420 | ||
| نویسندگان | ||
| امین الله ویسی1؛ محمد حسین شفیعی میم* 2 | ||
| 1دانشکده مهندسی مکانیک، دانشگاه سیستان و بلوچستان، زاهدان، ایران | ||
| 2دانشکده مهندسی مکانیک، دانشگاه بزرگمهر قائنات، قاین، ایران | ||
| چکیده | ||
| در کار حاضر جریان حول یک توربین باد محور افقی با استفاده از روش شبیه سازی گردابههای بزرگ در سرعتهای دورانی مختلف مطالعه شده است. نتایج نشان میدهند که افزایش سرعت دورانی باعث افت بیشتر سرعت در پایین دست جریان میشود. برای مثال در فاصله 1D پس از توربین باد در 6= λ2 سرعت کمینه 52 درصد سرعت اولیه است و پس از طی مسافت 6D این مقدار به 67 درصد سرعت اولیه میرسد. در 10 = λ3 سرعت کمینه 26 درصد سرعت اولیه است و پس از طی مسافت 6D این مقدار به 68 درصد سرعت اولیه میرسد. بسامد گردابههای جدا شده از پره با افزایش سرعت دورانی افزایش مییابند. گردابههای جدا شده از پره تمایل به پخش شدن در جهت عمودی دارند و با افزایش سرعت دورانی شدت پخش آن در جهت عمودی بیشتر میشود. تقویت گردابهها در ناحیه دنباله دور در سرعتهای دورانی بالاتر تنها بخاطر افزایش شدت چرخش نیست، بلکه بخاطر برخورد گردابهها به یکدیگر و تشکیل گردابههای جدیدتر است. این موضوع در کارهای گذشته گزارش نشده است. همچنین افزایش شدت آشفتگی و تنشهای برشی رینولدز در جهت جریان، بخاطر برش شدید جریان باد و تولید مکانیکی انرژی سینتیکی آشفتگی است. | ||
| کلیدواژهها | ||
| توربین باد؛ شبیهسازی گردابههای بزرگ؛ جریان آشفته؛ ساختارهای آشفتگی | ||
| عنوان مقاله [English] | ||
| Turbulent Structures in the Wake of a Wind Turbine Using Large Eddy Simulation | ||
| نویسندگان [English] | ||
| A. Veisi1؛ M.H. Shafiei Mayam2 | ||
| 1Department of Mechanical Engineering, Sistan and Baluchestan University, Zahedan, Iran | ||
| 2Department of Mechanical Engineering, Bozorgmehr-University of Qaenat, Qaen, Iran | ||
| چکیده [English] | ||
| In the present work the flow around a horizontal axis wind turbine has been studiedusing large Eddy simulation at different rotational speeds. The results show increasing rotational speedscauses a higher velocity deficit in the downstream direction. For example, in 1D after the wind turbinethe minimum velocity is 54% of the initial velocity and reach to the 67% of the initial velocity after waketravel 6D. At the rotational speed of λ3= 10 the minimum velocity is 26% of the initial velocity and reachto the 68% of the initial velocity after wake travel 6D. The frequency of vortex shedding is increasedby increasing the rotational speeds. Shed vortices tend to be extended in the y direction and its intensityaugmented by increasing the rotational speeds. The strengthen of vortices at higher rotational directionin far wake region not only due to the increased of swirling strength, but it is also due to the collision ofvortices and the formation of new vortices. This issue has not been reported in previous works. Also, theincrease of turbulence intensity and Reynolds shear stress in the flow direction is due to the severe windshear and high mechanical production of turbulent kinetic energy. | ||
| کلیدواژهها [English] | ||
| Wind turbine, Large Eddy Simulation, Turbulent flow, Turbulence structures | ||
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| مراجع | ||
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