بررسی تجربی تأثیر یک روزنه نوین جت نخودی بر عملکرد حرارتی جت های تزریق‌شده در یک جریان عرضی

نویسندگان

1 مرکز تحصیلات تکمیلی، دانشکاه هوایی شهید ستاری

2 دانشکده مهندسی هوافضا، دانشگاه علوم و فنون هوایی شهید ستاری

چکیده

در خنک­کاری لایه­ای، هوای خنک­کننده از طریق جت­هایی روی سطح تزریق می­شود تا لایه­ای محافظ در برابر گازهای دما بالا  فراهم شود. عملکرد خنک­کاری لایه­ای تا حد زیادی تحت تأثیر شکل روزنه جت­ها قرار دارد. و لذا بهینه­سازی و اصلاح شکل هندسی روزنه جت برای      دست­یابی به عملکرد خنک­کاری بهتر ضروری است. در این پژوهش، عملکرد خنک­کاری لایه­ای هندسه جدید جت­های استوانه­ای ناقص (نخودی) به­صورت تجربی با استفاده از روش دما نگاری مادون­قرمز بررسی شده است. آزمایش­ها در حالت انتقال حرارت پایا در عدد رینولدز جریان اصلی براساس قطر معادل جت (Rejet) 10,000 روی صفحه تخت انجام شده است. اندازه­گیری­ها در چهار نسبت­ دمش (M=ρjetVjet/ρ∞V∞) مختلف 4/0، 5/0، 7/0 و 8/0 انجام شده­اند. نتایج حاصل نشان می­دهد که هندسه­ پیشنهادی دارای نسبت دمش بهینه 7/0 در زاویه تزریق جت 30 درجه است و در نسبت دمش یکسان، اثربخشی خنک­کاری لایه­ای هندسه جدید بیش­تر است. به­عبارت دیگر، با استفاده از همان مقدار نرخ جریان جرمی تزریق­شده، توزیع یکنواخت­تری از لایه سیال خنک­کننده حاصل می­شود.

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