بررسی عددی تاثیر رزوناتور هلمهولتز و نوسان جریان اولیه بر عملکرد اجکتور مادون صوت

نوع مقاله : مقاله مستقل

نویسندگان

1 دانشجوی کارشناسی مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران

2 کارشناسی ارشد مهندسی مکانیک، دانشگاه صنعتی اصفهان، اصفهان، ایران

3 دانشیار دانشکده مهندسی مکانیک در تبدیل انرژی، دانشگاه صنعتی اصفهان، اصفهان، ایران

چکیده

پژوهش حاضر به تحلیل عددی اثر حفره هلمهولتز به عنوان یک یا دو جفت حفره عمیق بر روی محفظه اختلاط یک اجکتور مادون‌ صوت برای بررسی راندمان مکش می‌پردازد. در این تحلیل، با ثابت گرفتن عرض حفره، تأثیر عمق، مکان و تعداد حفره‌ها بر راندمان بررسی شد. معادلات ناپایدار رینولدز متوسط ناویر استوکس با مدل آشفتگی k-ε توسط نرم‌افزار فلوئنت 2R2022 برای درک فیزیک جریان و اندازه‌گیری راندمان مکش حل گردید. مشاهده میدان جریان گذرا نشان داد که حفره‌های مخالف به طور همزمان پر و خالی ‌‌می‌شوند که باعث ایجاد نوسانات طولی و ضربانی جریان در داخل محفظه اختلاط اجکتور می‌‌شود. نتایج نشان دادند که وجود حفره در ابتدا، وسط و انتها محفظه اختلاط، راندمان مکش اجکتور را بترتیب 0.6%، 3.8% و 6.6% و همچنین وجود حفره ثانویه در موقعیت‌های 20، 40 و 60 میلی‌متر نسبت به حفره اول، راندمان مکش را بترتیب 9.9%، 10.1% و 10.2% کاهش می‌دهد. علاوه بر این، اثر طول دو جفت حفره در فاصله 20 میلی‌متر از هم در عمق‌‌های 75، 100 و 125 میلی‌متر باعث کاهش 4.9%، 9.9% و 13.1% راندمان مکش می‌شود. همچنین دامنه نوسانات فشار حفره‌ها در جفت اول از جفت دوم ضعیف‌تر است. بطور کلی، نتایج بررسی رزوناتور هلمهولتز نشان دادند نوسان جریان ثانویه بدلیل انسداد جریان ثانویه باعث کاهش راندمان می‌شود. لذا در بخش پایانی پژوهش، تأثیر ایجاد نوسان جریان محرک اولیه مورد بررسی قرار گرفت که نتایج آن نشان داد نوسان جریان اولیه بدلیل افزایش اختلاط مؤثر جریان اولیه و ثانویه، راندمان مکش را به میزان 5.2% افزایش میدهد.

کلیدواژه‌ها

موضوعات


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