کاهش جدایش جریان و درگ کلی ایرفویل ناکا 4415 با ایجاد شیار بر روی آن
محورهای موضوعی : یافته های نوین کاربردی و محاسباتی در سیستم های مکانیکی
1 - هیئت علمی دانشگاه امام علی(ع)
کلید واژه: ایرفویل ناکا 4415, افزایش راندمان ایرفویل, تغییر هندسی ایرفویل, تاثیر شیار, کاهش جدایش جریان ,
چکیده مقاله :
ایرفویل‌ها با توجه به هندسه خاص خود طوری طراحی شدهاند تا بتوانند به‌صورت بهینه نیروی لیفت ایجاد کنند و کارایی سازه‌های هوایی یا دریایی را بهبود بخشند. علاوه بر طراحی‌های استاندارد و رایج ایرفویل‌ها در صنایع مختلف، می‌توان برای افزایش بهره‌وری آنها را نیز بهینهسازی نمود. در این پژوهش، نیروی لیفت تولید شده توسط ایرفویل‌های شیاردار NACA 4415 که در هواپیماها، پهپادها و توربین‌های بادی کاربرد دارند، مورد بررسی قرارگرفته است. با استفاده از روش طراحی آزمایش فاکتوریل کامل، تأثیر تعداد و عمق شیارها بر نیروی لیفت در زوایای حمله مختلف و در یک عدد رینولدز ثابت ارزیابی شده است. نتایج نشان می‌دهد که شیارها در برخی از زوایا منجر به افزایش چشمگیر نیروی لیفت شدهاند. به طوری که در زاویه حمله 13 درجه افزودن شیار به سطح ایرفویل می‌تواند نیروی لیفت را تا 31% افزایش دهد.
Lift force is essential in the movement of bodies in fluid environments, as it enables aerodynamic objects to shift perpendicularly to the direction of their motion. Airfoils are specifically designed with unique geometries to efficiently generate lift force, enhancing the performance of aerial or marine structures. Despite the use of standardized and widely adopted airfoil designs across various industries, further optimizations are still possible to increase efficiency. In this study, the lift force generated by slotted NACA 4415 airfoils, commonly used in aircraft, UAVs, and wind turbines, is examined. Using a full factorial experimental design, the effects of slot number and depth on lift force at various angles of attack and at a constant Reynolds number were evaluated. The results indicate that slots have minimal impact on lift force at certain angles of attack, while leading to significant increases at others. For example, at an angle of attack of 13 degrees, adding slots to the airfoil surface can increase lift force by up to 31%.
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