نوع مقاله : مقاله پژوهشی
نویسندگان
1 صنعتی خواجه نصیرالدین طوسی
2 دانشجوی دکتری، دانشکده مهندسی مکانیک، دانشگاه صنعتی خواجه نصیرالدین طوسی
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The current study has used three-dimensional simulation of flow around the three-bladed Darrieus turbine to investigate the turbine's self-starting power. Two types of straight bladed and helical bladed turbines, which are equipped with a J-type blades are considered. To fully investigate, the effects of various parameters including wind speed, blade height, and the tips shape of J-type blades which could be open or closed have been studied and the results have been compared with those of the turbine with conventional blades. The analysis of the flow around the J-type blades determined that the vortices formed on the pressure side increase the pressure on this surface and thus rise 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 on the self-starting and low TSR situations. The results showed that 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 TSRs. It was also concluded that 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]
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