بررسی عددی پدیده‌ی دنباله در توربین‌های دو و سه‌پره‌ی جریان جزر و مدی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، گروه مهندسی مکانیک، واحد ماهشهر، دانشگاه آزاد اسلامی، ماهشهر، ایران

2 دستیار تحقیق، گروه مهندسی مکانیک، واحد ماهشهر، دانشگاه آزاد اسلامی، ماهشهر، ایران

چکیده

در این مقاله پدیده دنباله، در توربین­های جریان جزر و مدی دو پره و سه پره مورد بررسی قرار گرفته است. جهت تحلیل، از روش دینامیک سیالات محاسباتی در قالب نرم­افزار ANSYS-FLUENT استفاده شده است. در ابتدا، توربین­ها در مقادیر مختلف سرعت نسبی نوک پره مورد ارزیابی قرار گرفتند و بیشینه توان تولیدی آن ها محاسبه گردید. سپس، ناحیه دنباله برای شرایط بیشینه توان تولیدی مورد ارزیابی قرار گرفت. نتایج نشان داد که در سرعت نسبی نوک پره برابر با 5، بیشینه ضریب توان برای هر دو توربین قابل استحصال است که مقدار آن برای توربین سه پره معادل با 35/0 و برای توربین دو پره برابر با 28/0 می باشد. همچنین، پدیده دنباله در توربین های دو پره نسبت به توربین سه پره زودتر به پایان می رسد به گونه ای که؛ در فاصله ای معادل با سیزده برابر قطر توربین نسبت به محل قرارگیری آن، مقدار سرعت برای توربین دو پره به 87% سرعت اولیه و برای توربین سه پره به 81% سرعت اولیه خود بازگشته است. بنابراین، با در نظر گرفتن توان تولیدی بالاتری که از توربین­های سه پره قابل استحصال است، زمانی که مساحت به کار گرفته شده به منظور ایجاد مزرعه اهمیت کمتری داشته باشد، می­توان با چیدمان سه پره توان بیشتری را از مزرعه برداشت کرد. بالعکس، زمانی که مساحت مزرعه از اهمیت خاصی برخوردار باشد، توربین­های دو پره برای استفاده مناسب تر به نظر می رسند.

کلیدواژه‌ها

موضوعات


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