مطالعه اثرگذاری کنترل‌کننده دمشی بر روی جریان وامانده دینامیکی بالواره ناکا0012

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در این مطالعه به بررسی تاثیر پارامتر‌های جت دمشی که شامل مکان، زاویه، ضریب ممنتوم و مساحت دهانه می‌باشد، در میانگین ضرایب و پارامتر عملکرد آیرودینامیکی بالواره متقارن ناکا0012 پرداخته شده‌است. بالواره دارای حرکت نوسانی سینوسی حول یک چهارم وتر می‌باشد. در اثر این حرکت زاویه حمله بالواره از 5- تا 25 درجه تغییر می‌کند. پنج مکان 1، 4، 6، 10 و 20 درصد طول وتر مورد بررسی قرار گرفتند و نتایچ نشان دادند که قرارگیری جت در مکان 1 درصد طول وتر نسبت به سایر مکان‌ها مناسب‌تر است و باعث بهبود قابل‌توجه‌ای در عملکرد و تاثیر بیشتر جت در کنترل جریان می‌شود . سه زاویه 60،30 و 90 درجه به عنوان زوایای جت خروجی در نظر گرفته شدند و مشاهده شد که زاویه 60 درجه نسبت به دو زاویه دیگر در کنترل جریان بهتر عمل می‌نماید و این زاویه‌موثر در اثر افزایش اندازه دهانه خروجی، کاهش می‌یابد. نتایج نشان دادند که یک روند صعودی یا نزولی منظم برای تاثیر زاویه وجود ندارد. برای ضریب ممنتوم جت که در واقع هدف از آن بررسی تاثیر سرعت جت دمشی بود، مقادیر 0.04، 0.08 و 0.14 در یک اندازه دهانه ثابت در نظرگرفته شد. نتایج حاکی از آن بود که افزایش سرعت جت خروجی و همچنین افزایش اندازه دهانه جت باعث بهبود عملکرد آیرودینامیکی می‌شود اگرچه با افزایش اندازه دهانه در ضریب ممنتوم ثابت، ضریب برای میانگین کاهش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Investigation of the impact of blowing jet on the dynamic stall of NACA0012

نویسندگان [English]

  • saman kasmaiee
  • Mehran Tadjfar
  • siroos kasmaiee
Department of Aerospace Engineering, Amirkabir University of Technology, Tehran, Iran
چکیده [English]

In this study, the effect of blowing jet parameters, which include location, blowing angle, momentum coefficient, and orifice area, on the average aerodynamic coefficients and aerodynamic performance parameter of the NACA0012 is investigated. The airfoil has a sinusoidal oscillating motion around a quarter of the chord. As a result of this movement, the angle of attack of the airfoil changes from -5 to 25 degrees. Five locations by 1, 4, 6, 10, and 20% of the chord length were examined and the results showed that the placement of the jet at 1% of the chord length is more appropriate than the other locations and significantly improves performance and have more impact on the flow control. Three angles of 30, 60, and 90 degrees were considered as the angles of the blowing jet and it was observed that the angle of 60 degrees is better in controlling the flow than the other two angles and this effective angle decreases when orifice length increases. The results show that there is no regular uptrend or downtrend for the angle effect. For the jet momentum coefficient, which actually aimed to investigate the effect of blowing jet velocity, the values of 0.14, 0.08, and 0.04 were considered while the orifice length is considered constants for these cases. The results showed that increasing the blowing jet velocity as well as increasing the jet orifice length improves aerodynamic performance, although increasing the orifice length at a constant momentum coefficient decreases the mean of lift coefficient.

کلیدواژه‌ها [English]

  • Dynamic stall
  • Active controller
  • Continuous blowing jet
  • Unsteady flow
  • Aerodynamics performance

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