تحقیقات موتور

تحقیقات موتور

عملکرد متغیری ایرفویل‌های تداخلی-نوسانی و مکاشفه‌ای بر پتانسیل بال سنجاقک در بهبود بازده پیشرانش

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه تربیت مدرس، تهران، ایران
چکیده
این پژوهش با انجام شبیه‌سازی‌های عددی دقیق جریان در عدد رینولدز 33000، به بررسی کمی و عمیق تأثیر متغیرهای هندسی و آرایشی بر عملکرد ایرفویل‌های نوسانی NACA 0012، مشتقات آن، و یک ایرفویل زیست‌الهام سنجاقک می‌پردازد. نتایج بدست آمده نشان می‌دهند که در آرایش پشت سر هم، چیدمان بهینه با فاصله محوری دو نیم برابر طول وتر ایرفویل و اختلاف حالت‏ 90 درجه، ضریب برآی میانگین (Cl mean​)  ایرفویل جلویی را به میزان قابل توجهی 15% افزایش داده و در عین حال بازده پیشرانش سامانه‏ را در 85% بازده ایرفویل منفرد حفظ می‌کند. تجزیه و تحلیل تأثیر هندسه نشان داد که ضخامت 15% نسبت به 25%، Cl mean را 10% بهبود بخشیده و جدایش جریان را کاهش می‌دهد؛ در حالی که انحنا با وجود افزایش 20 درصدی ​ Cl mean، منجر به کاهش 12 درصدی ​Ct mean (از 0. 5 به 0. 44) و 8 درصدی ​Cp mean (از 0. 6 به 0. 552) می‌شود. همچنین، یک زاویة نصب 10 درجه برای ایرفویل جلویی در آرایش تاندم، ​Cd mean ایرفویل عقبی را 25% (از 0. 4 به 0. 3) کاهش داده و نیروی پیشران معادل 0. 02 (15% Cd منفرد) تولید می‌کند. ایرفویل زیست‌الهام سنجاقک با ساختار چین‌خورده خود، برتری محسوسی در تأخیر انداختن واماندگی تا زاویة حمله 20 درجه و افزایش 18 درصدی Cl (از 0. 908 به 1. 0718) نشان می‌دهد. در مقایسه کلی، ایرفویل منفرد NACA 0012  به طور میانگین Ct mean (0. 5 در مقابل 0. 41، 18% بیشتر)، ​Cl mean (8. 5 در مقابل 7. 58، 12% بیشتر) و Cp mean (0. 6 در مقابل 0. 51، 15% بیشتر) نسبت به متوسط عملکرد چیدمان‌های تاندم مورد بررسی، تولید می‌کند. این مجموعه دقیق از داده‌های کمی، چارچوبی مستحکم برای طراحی و بهینه‌سازی هدفمند سامانه‏‌های پیشرانش نوسانی با تمرکز بر کارایی بالا و تولید برآی مؤثر ارائه می‌دهد و سهم قابل توجهی در پیشبرد دانش دینامیک سیالات ناپایدار در این حوزه دارد.
کلیدواژه‌ها

عنوان مقاله English

Parametric performance of tandem oscillating airfoils and an exploration of dragonfly wing potential in enhancing propulsive efficiency

نویسندگان English

Mehrdad Farokhinejad
Fathollah ommi
Mechanical Engineering Department, Tarbiat Modares University, Tehran, Iran
چکیده English

This research conducts detailed numerical simulations of unsteady flow at a Reynolds number of 33000 to quantitatively and thoroughly investigate the impact of geometric and arrangement parameters on the performance of oscillating NACA 0012 airfoils, their derivatives, and a bio-inspired dragonfly airfoil. The obtained results demonstrate that in a tandem arrangement, an optimal configuration with an axial spacing of two and a half chord lengths (X/c=2. 5) and a 90-degree phase difference significantly increases the mean lift coefficient (Cl_mean​) of the leading airfoil by 15% while simultaneously maintaining the system's propulsive efficiency at 85% of that of the isolated airfoil. Analysis of geometric effects revealed that 15% thickness improves Cl_mean by 10% compared to 25% thickness and reduces flow separation; while camber, despite a 20% increase in Cl_mean (from 8. 5 to 10. 2), leads to a 12% decrease in Ct_mean (from 0. 5 to 0. 44) and an 8% decrease in Cp_mean (from 0. 6 to 0. 552). Furthermore, a 10-degree installation angle for the leading airfoil in the tandem arrangement reduces the trailing airfoil's drag coefficient (Cd) by 25% (from 0. 4 to 0. 3) and generates an equivalent thrust force of 0. 02 (15% of the isolated airfoil's Cd). The bio-inspired dragonfly airfoil, with its corrugated structure, exhibits a significant advantage in delaying stall up to a 20-degree angle of attack and increasing Cl_mean by 18% (from 0. 908 to 1. 0718). In a general comparison, the isolated NACA 0012 airfoil produces higher average Ct_mean (0. 5 vs. 0. 41, 18% more), Cl_mean (8. 5 vs. 7. 58, 12% more), and Cp_mean (0. 6 vs. 0. 51, 15% more) compared to the average performance of the tested tandem configurations. Collectively, these precise quantitative data provide a robust framework for the rational design and targeted optimization of oscillating propulsion systems focusing on high efficiency and effective lift generation, making a significant contribution to advancing the knowledge of unsteady fluid dynamics in this field.

کلیدواژه‌ها English

Propulsive Efficiency
Leading-Edge Vortices (LEV)
Dragonfly Bio-inspired Airfoil
Tandem Configuration
Oscillating Airfoil Aerodynamics
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  • تاریخ دریافت 25 اردیبهشت 1404
  • تاریخ بازنگری 28 اردیبهشت 1404
  • تاریخ پذیرش 01 خرداد 1404