مطالعه اثرگذاری کنترل‌کننده دمشی بر روی جریان وامانده دینامیکی بالواره ناکا0012

علوم کاربردی و محاسباتی در مکانیک

دوره 34، شماره 1 - شماره پیاپی 27، خرداد 1401، صفحه 1-20   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2022.74008.1074

نویسندگان

سامان کسمائی^* ؛ مهران تاج‌فر؛ سیروس کسمائی

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

واماندگی دینامیکی؛ کنترل‌کننده فعال؛ جت دمشی پیوسته؛ جریان ناپایا؛ عملکرد آیرودینامیکی

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