بهبود عملکرد آیرودینامیکی توربین بادی محور عمودی ترکیبی داریوس-ساونیوس

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر (پلی تکنیک تهران)، تهران، ایران.

چکیده

پره‌های پشت به باد توربین‌های ساونیوس اثر منفی در تولید گشتاور این توربین‌ها دارند. با افزایش نسبت سرعت نوک پره این اثر منفی در تولید گشتاور بیشتر می‌شود. به همین علت بخش ساونیوس در توربین‌های ترکیبی داریوس- ساونیوس پس از شروع به حرکت و با افزایش نسبت سرعت نوک پره، گشتاور منفی تولید می‌نماید. در پژوهش حاضر، مقابل پره‌های پشت به باد توربین ساونیوس یک دیواره قرار داده شده است تا اثرات منفی این پره‌ها در تولید گشتاور کاهش یابد و در نتیجه عملکرد آیرودینامیکی آن بهبود داده شود. دو نوع پره ساونیوس با طول قوس مختلف و سه نوع دیواره با جانمایی مختلف به‌صورت سه‌بعدی شبیه‌سازی شده و گشتاور تولیدی و مقدار نوسانات گشتاور آنها در یک دور کامل محاسبه شده است. توربین ساونیوسی که بیشترین گشتاور متوسط و کمترین نوسانات گشتاور را دارد روی یک توربین داریوس پره مستقیم سوار شده و توربین ترکیبی را تشکیل داده است. در مقایسه با توربین داریوس پره مستقیم، در نسبت سرعت نوک پره 0/9 توربین ترکیبی پیشنهادی 2/3  درصد گشتاور متوسط بیشتر و 40 درصد نوسانات گشتاور کمتری دارد. این امر نشان می‌دهد توربین ترکیبی پیشنهادی در مقایسه با مدل‌های متداول خود از نظر نسبت سرعت نوک پره، حوزه کاری گسترده‌تری دارد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Aerodynamic Performance Improvement of Hybrid Darrieus-Savonius Vertical Axis Wind Turbine

نویسندگان [English]

  • Abolfazl Abdolahifar
  • S.M.H Karimian
Department of Aerospace Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
چکیده [English]

Returning blades of Savonius vertical axis wind turbines make negative effects on the total moment produced by the turbines especially at high tip speed ratios. For hybrid Darrieus[1]Savonius vertical-axis wind turbines at the dynamic mode, with tip speed ratio increment from self[1]starting to that of high values, returning blades of its Savonius part make the whole part to produce negative moment. In the present work, in order to reduce negative effects of returning blades of Savonius vertical-axis wind turbines and consequently improve its aerodynamic performance, a wall is placed in front of them. Several configurations including two types of blade shapes with three types of wall placements are simulated three-dimensionally and their output-moment and moment fluctuations are computed for one complete cycle. Desired Savonius vertical-axis wind turbine with suitable wall which produces the most average-moment and the least moment fluctuations are mounted on a straight-blade Darrieus vertical-axis wind turbine and they formed a hybrid vertical-axis wind turbine. In comparison to straight-blade vertical-axis wind turbine, at the tip speed ratio of 0.9 proposed hybrid vertical-axis wind turbines produces 2.3% more average-moment along with 40% fewer moment fluctuations. This means in term of tip speed ratio values, proposed hybrid vertical-axis wind turbine has wider operating range in comparison to its general types.

کلیدواژه‌ها [English]

  • Darrieus
  • Savonius
  • Hybrid turbine
  • Dynamic mode
  • numerical simulation
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