بررسی تجربی اثر سطح بر واماندگی دینامیکی یک پرنده بالزن در حرکت رو به جلو

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی دانشگاه فردوسی مشهد

2 گروه مکانیک دانشگاه فردوسی مشهد

چکیده

در این تحقیق،اثرسطح بر واماندگی دینامیکی یک پرنده­ بالزن ساده و با بال دارای زاویه شکستگی در پرواز رو به جلو توسط روش تجربی بررسی شده است. برای این منظور، ابتدا یکساز و کاربالزن به همراه تجهیزات نصب در تونل­باد طراحی و ساخته شده است. سپس بالزن ساده و بالزن دارای زاویه شکستگی، در فاصله از سطح 1 و 5/1 برابر طول وتر، فرکانس بالزنی Hz5/3 و زاویه حمله‌های00تا 50/22در تونل­باد با سرعت m/s3 مورد آزمایش قرار گرفته­اند. همچنینبه‌منظور بررسیتأثیر فرکانس بالزنی و فاصله از سطح بر نیروی برآ، نیروی پیشران و توان مفید، بالزن ساده و شکسته با زاویه حمله صفر، در فاصله از سطح­های1، 5/1 و 2برابر طول وتر و فرکانس­های بالزنیHz0، 2، 5/3 و5 درسرعت m/s3تستشده است. نتایج نشان­می­دهند که واماندگی دینامیکی بالزن ساده با کاهش فاصله از سطح، در زاویه حمله کمتری نسبت به بال دارای شکستگی اتفاق می­افتد. در کمترین فاصله از سطح (1 برابر طول وتر)، واماندگی بالزن ساده و بالزن با زاویه شکستگی 1070 به ترتیب در 50/12 و 150 رخ داده­است. علاوه بر این،بالزن با زاویه شکستگی عملکرد بهتری نسبت به بالزن ساده دارد. نتایج این تحقیق نشان می­دهد که با کاهش فاصله از سطح و افزایش فرکانس بالزنی، نیروهای آیرودینامیکی و توان مفید افزایشیافته است.

کلیدواژه‌ها

عنوان مقاله [English]

Empirical Study of the Ground Effect on the Dynamic Stall of a Flapping Wing in Forward Flight

نویسندگان [English]

  • Mohammad Hassan Djavareshkian 1
  • Yeganeh Azargoon 2
1 Mech. Engg. Dept. Faculty of Engg. Ferdowsi University of Mashhad
2 mech Engg. Dept. Ferdowsi University of Mashhad
چکیده [English]

In the present study, the ground effect on the dynamics stall of the flapping wing with the bending deflection angle is experimentally investigated in the forward flight.For this purpose, first, a bending deflection mechanism and the installed facilities for the wind tunnel have been designed and fabricated.Then the simple and bending flapping wings are experimentally examined for h/c=1,1.5, flapping frequency 3.5 Hz and different angles of attack from 00 to 22.50 with velocity 3 m/s. Also, to investigate the effect of flapping frequency and distance from surface on lift force, thrust force and loading power of the simple and bending flapping wings with no angle of attack tested for h/c=1,1.5,2, different flapping frequency from0 Hz to 5 Hz and velocity 3 m/s. Results indicated that decreasing the distance from the surface, dynamic stall of the simple flapping wing occurs at lower angles of attack compared to the bending flapping wing. More specifically, in the minimum distance from the surface (h/c = 1), the stall angle of the simple flapping wing and bending flapping wing (with bending deflection angle of 1070) takes place at 12.50 and 150, respectively. The performance of the bending flapping wing is generally better than the simple flapping wing. Besides, by enhancing flapping frequency and decreasing the distance from the surface, aerodynamic forces and loading power increase.

کلیدواژه‌ها [English]

  • Experimental-aerodynamic"
  • Ground-effect"
  • Stall of flapping wing"
  • Bending deflection "
  • Forward flight"
  • "
  • MAVs"

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سابقه مقاله

  • تاریخ دریافت: 27 آبان 1399
  • تاریخ بازنگری: 13 تیر 1400
  • تاریخ پذیرش: 20 تیر 1400
  • تاریخ انتشار: 08 آذر 1400

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