علوم و فناوری فضایی

علوم و فناوری فضایی

مطالعه عددی مکانیزم کاهش پسا در سطوحی با ریزساختارهای مثلثی عرضی

نوع مقاله : مقالة‌ پژوهشی‌

نویسندگان
1 دانشجوی دکترا، پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
2 پژوهشگاه هوافضا، وزارت علوم، تحقیقات و فناوری، تهران، ایران
چکیده
یکی از مهم‌ترین تکنیک‏های غیرفعال در زمینه کاهش نیروی پسا، استفاده از سطوح ریزساختار می‌باشد. ساختارهای این سطوح که از مرتبه نانومتر تا چند صد میکرومتر می‌باشند می‌توانند به‌صورت تصادفی و یا به شکل منظم و کنترل شده، با هندسه و چیدمان مختلف بر روی سطح ایجاد شوند و با تاثیر بر جریان گذرنده، پسای تولیدی را دستخوش تغییر قرار ‏دهند. این مقاله با هدف مطالعه فیزیک حاکم بر سطوح ریزساختار، به بررسی پارامترهای حاصل از عبور جریان هوا از روی آنها می‌پردازد که از جمله این پارامترها می‌توان به مولفه‌های پسا، پروفیل‌های سرعت و تنش برشی اشاره نمود. به این منظور از ریزساختارهای مثلثی با قاعده و ارتفاعی یکسان و برابر با 50، 100، 200، 400 و 800 میکرومتر استفاده شده است که به‌صورت عرضی در معرض جریانی با سرعت m/s 5 و m/s 25 قرار گرفته‌اند. این ریزساختارها بر روی صفحه‌ای به طول mm 60 ایجاد شده‌اند که برای انجام مقایسه دقیق‌تر، mm 10 از ابتدا و انتهای صفحه در مقایسه‌ها لحاظ نگردیده است. با توجه ‌به تاکید برخی مقالات بر لغزش جریان از روی ریزساختارها، پروفیل‌های سرعت بر روی این سطوح بررسی شده است اما در نهایت تغییر در مقدار و جهت تنش برشی به‌عنوان مکانیزم اصلی کاهش پسای اصطکاکی تشریح گردیده و اثر ابعاد و سرعت جریان بر آن بررسی شده است. نتایج به‌دست‌آمده نشان می‌دهد که گردابه‌های محبوس در میان ساختارهای عرضی این سطوح می‌توانند با کاهش مقدار تنش برشی در اطراف قله‌ها و نیز تغییر جهت آن در دره‌ها منجر به کاهش پسای اصطکاکی گردند. از سوی دیگر ایجاد اختلاف فشار در داخل و اطراف ساختارها منجر به ایجاد پسای فشاری خواهد شد. برآیند این دو مولفه پسا که به ابعاد ریزساختارها و نیز سرعت جریان وابسته‌اند، نهایتا مقدار افزایش و یا کاهش پسای کل را تعیین خواهد کرد.
کلیدواژه‌ها
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دوره 18، شماره 1
1404
صفحه 24-37

  • تاریخ دریافت 27 مرداد 1403
  • تاریخ بازنگری 22 آبان 1403
  • تاریخ پذیرش 09 دی 1403
  • تاریخ اولین انتشار 09 دی 1403