نوع مقاله : علمی پژوهشی
نویسندگان
1 دانشیار، دانشگاه صنعتی شریف ، دانشکده هوافضا ، تهران ، ایران
2 دانشجوی دکتری، دانشگاه صنعتی شریف ، دانشکده هوافضا ، تهران ، ایران.
3 دانشجوی کارشناسی ارشد، ، دانشگاه صنعتی شریف ، دانشکده هوافضا تهران ، ایران.
چکیده
در این مقاله، مطالعة میدان جریان یک محفظة احتراق توربین گاز مدل در حالت سرد برای کارکرد معمول و چسبیدگی شعله به سرمشعل به روش تجربی و نیز با کمک شبیهسازی گردابههای بزرگ انجام شده است. ابعاد هندسی پلنیوم و نتایج اندازهگیری تجربی صدای محفظه بیانگر تولید صدایی با فرکانس نزدیک به رزونانس پلنیوم دارد. برای بررسی اثر میدان جریان، از نتایج عددی برای کارکرد معمول مشعل و حالت شعله چسبیده استفاده شده است. نتایج عددی نشان میدهد که تغییر نسبت هوا میان چرخانندة بیرونی و داخلی به متمایل شدن لایة برشی خروجی به سمت سرمشعل و ایجاد جت کواندا روی دیواره منجر میشود. میدان جریان حاصل از شبیهسازی عددی نشان میدهد که در حالت چسبیدگی شعله به سرمشعل، ناحیة جریان بازگشتی داخلی سرعتهای منفی کوچکتر به خود میگیرد و ناپایداری لایة برشی در خروجی نازل بیرونی و گردابههای آن در اثر چسبیدگی جریان به دیواره از بین میروند. حذف ناپایداری لایة برشی در خروجی یکی از نازلها میتواند عامل حذف یکی از دو فرکانس پایه نوسانات و مضارب صحیح آن در اندازهگیریهای تجربی باشد.
کلیدواژهها
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