تحلیل عددی گذرش در جریان آرام حول ایرفویل با نوسان پیچشی

علوم کاربردی و محاسباتی در مکانیک

مقاله 6، دوره 36، شماره 4 - شماره پیاپی 38، دی 1403، صفحه 93-110   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2024.87292.1246

نویسندگان

حسین انصاریان^{* 1}؛ علیرضا داوری²

¹دانشگاه صنعتی مالک اشتر تهران

²گروه هوافضا، دانشکده فنی مهندسی، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات تهران

چکیده

پاسخ دینامیکی یک ایرفویل جریان آرام طبیعی که تحت نوسانات هماهنگ پیچشی کم‌دامنه قرار می‌گیرد، با استفاده از شبیه‌سازی گردابه‌های بزرگ با عدد رینولدز مبتنی بر وتر 750.000 انجام شده است. در طی چرخه‌های پیچشی، تغییرات زیاد در موقعیت گذرش و همچنین جدایش در لبه‌ی فرار مشاهده می شود. این منجر به پاسخ غیرخطی نیروهای آیرودینامیکی می‌شود. اگرچه ماهیت جریان بسیار غیرخطی است، تکامل لایه مرزی روی سطح ایرفویل را می‌توان با استفاده از یک مفهوم ساده‌‌ی تأخیر فاز مدل‌سازی کرد که تکامل شبه‌پایای لایه‌ی مرزی را پیشنهاد می‌دهد. بر اساس این فرض تأخیر فاز، یک مدل مهندسی ساده‌ی جدید توسعه داده شده که به خوبی با داده‌های تجربی انداز‌ه‌گیری‌شده مطابقت دارد. با کمک این مدل، جمله‌ی شبه‌پایا به‌عنوان منبع اولیه‌ی رفتار غیرخطی‌ در نیروهای آیرودینامیکی ناپایا شناسایی می‌شود که می‌تواند از مشخصه‌های ایرفویل استاتیک استخراج شود. قدرت این جمله با تغییر فرکانس کاهش‌یافته بدون تغییر باقی می‌ماند، اما قدرت عبارت نوسانی که اثرات ناپایا را مدل می‌کند، با افزایش فرکانس افزایش می یابد.

کلیدواژه‌ها

جریان آرام؛ شبیه‌سازی گردابه‌های بزرگ؛ نوسان پیچشی؛ پاسخ ناپایا

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