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بررسی عددی گشتاور راهاندازی توربین باد محور عمودی داریوس با پره جی-شکل | ||
نشریه مهندسی مکانیک امیرکبیر | ||
مقاله 6، دوره 56، شماره 3، 1403، صفحه 439-464 اصل مقاله (3.14 M) | ||
نوع مقاله: مقاله پژوهشی | ||
شناسه دیجیتال (DOI): 10.22060/mej.2024.23060.7714 | ||
نویسندگان | ||
رامین فرزدی؛ مجید بازارگان* | ||
دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی، تهران، ایران | ||
چکیده | ||
پژوهش کنونی با بهرهگیری از شبیهسازی سه بعدی جریان حول توربین داریوس سه پرهای به بررسی توان راهاندازی توربین میپردازد. دو نوع توربین پره مستقیم و پره مارپیچ مجهز به پرههایی با پروفیل جی-شکل مورد بررسی قرار گرفتهاند. تاثیر کمیتهای گوناگون نظیر سرعت باد، ارتفاع پرهها و باز یا بسته بودن انتهای پره جی-شکل مورد مطالعه قرار گرفته و با توربین مجهز به پرههای کامل مقایسه شده است. تحلیل جریان حول پره آشکار ساخت که گردابههای شکل گرفته در سطح فشار پره جی-شکل موجب افزایش گشتاور تولیدی میشوند. با بستن انتهای پره جی-شکل از خروج این گردابهها در لبههای انتهایی جلوگیری میشود که تاثیر مثبت قایل ملاحظهای در شرایط راهاندازی و شرایطی که روتور دارای چرخش است ، دارد. متوسط گشتاور تولیدی برای توربین پره مستقیم و پره مارپیچ مجهز به پره جی-شکل با انتهای بسته به ترتیب تحت شرایط راهاندازی 38/5 و 21 درصد و در نسبت سرعت نوک پره کم 49/5 و41/9 درصد نسبت به توربین با پره کامل افزایش داشته است. اثر مثبت استفاده از پرههای جی-شکل تحت شرایط راهاندازی برای سرعتهای کم باد و ارتفاعهای بلندتر پره بارزتر میباشد که این پره را به گزینه مناسبی برای به کارگیری توربین در مناطق شهری بدل میکند. | ||
کلیدواژهها | ||
توربین داریوس؛ پره جی-شکل؛ قدرت راهاندازی؛ توربین پره مستقیم؛ توربین پره مارپیچ | ||
عنوان مقاله [English] | ||
Numerical study of self-starting torque in Darius vertical axis wind turbines with J-type blades | ||
نویسندگان [English] | ||
Ramin Farzadi؛ Majid Bazargan | ||
Ph.D. Candidate, Mechanical Department, K. N. Toosi University of Technology, Tehran Iran | ||
چکیده [English] | ||
The current study has used a three-dimensional simulation of flow around the three-bladed Darrieus turbine to investigate the turbine's self-starting power. Two types of straight and helical-bladed turbines, which are equipped with J-type blades are considered. The effects of various parameters including wind speed, blade height, and the tip shape of J-type blades which could be open or closed have been studied and compared with those of the turbine with conventional blade form. The flow analysis around the J-type blades determined that the vortices formed on the pressure raise the torque production. By closing the ends of the J-type blade, these vortices are prevented from exiting at the ends that leads to a substantial improvement in the self-starting and low tip speed ratios. The average torque produced by the straight and helical-bladed turbines equipped with closed-end J-type blades is respectively 38.5% and 21% higher than the turbines with full profile blades under self-start-up conditions, and the aforementioned percentages are 49% and 41.9% at low tip speed ratios. The positive effect of using J-type blades under self-starting conditions is more pronounced at low wind speeds and higher blade heights, which makes these blades a viable option for urban applications. | ||
کلیدواژهها [English] | ||
Darrieus turbine, J-type blade, Self-starting power, Straight bladed turbine, Helical bladed turbine | ||
مراجع | ||
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