کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7053538 | 1457609 | 2018 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Schooling behavior of rigid and flexible heaving airfoils
ترجمه فارسی عنوان
رفتار مکانیکی هواپیما بر روی سفت و سخت انعطاف پذیر
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
چکیده انگلیسی
The schooling behavior of rigid and flexible NACA0017 airfoils undergoing a heaving motion was experimentally explored using a merry-go-round configuration. Each airfoil was attached to the end of a horizontal support bar whose other end was connected to a freely rotating vertical axis. The axis was forced to undergo a sinusoidal motion in the vertical direction to generate a pure heaving motion of the airfoil in the frequency range of 0.4 to 4.8â¯Hz. The propulsion due to the heaving airfoil was expressed as the horizontal rotational speed of the support bar. This experimental setup simulates an infinite schooling of airfoils separated by a streamwise distance d undergoing in-phase heaving motions. The ratio of the distance to the chord length, d/c, was determined by the number of airfoils (2 â¤Â n â¤Â 8). The variation in rotational frequency F as a function of heaving frequency f was determined using different experimental parameters. The schooling number Sâ¯=â¯f /(nF), which represents the number of heaving oscillations between each pair of successive airfoils, was introduced to explain the schooling behavior of the airfoils. The effects of airfoil flexibility, d/c and f on the propulsive performance were examined in the context of the schooling behavior of the airfoils.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Heat and Fluid Flow - Volume 69, February 2018, Pages 224-233
Journal: International Journal of Heat and Fluid Flow - Volume 69, February 2018, Pages 224-233
نویسندگان
Sunghyuk Im, Sung Goon Park, Yeunwoo Cho, Hyung Jin Sung,