تحلیل عددی خنک کاری لایه ای پره توربین در حال چرخش با استفاده از مجرای گسترش‌ یافته جانبی

نویسندگان

دانشکده مهندسی مکانیک دانشگاه سمنان

چکیده

در این مقاله، بهینه­سازی اثربخشی خنک­کاری لایه­ای در یک پره توربین در حال چرخش، با استفاده از مجرای گسترش یافته­ جانبی انجام شده است. شبیه­سازی عددی سه­بعدی خنک­کاری پره توربین با استفاده از مدل آشفتگی k-ε RNG در سه سرعت چرخش صفر، 300 و 500 دور بر دقیقه انجام شده است. نتایج به­دست­آمده، نشان می­دهد که افزایش سرعت دورانی پره به واسطه ایجاد شتاب کریولیس، منجر به انحراف جریان هوای خنک­کننده از روی خط مرکزی می­شود. انحراف جریان هوای خنک­کننده باعث کاهش میزان اثربخشی خنک­کاری در خط مرکزی پره به ویژه در پایین دست سوراخ تزریق می­شود. مقایسه نتایج سوراخ تزریق استوانه­ای (بیضوی) و مجرای گسترش­یافته جانبی، نشان می­دهد که اختلاط هوای خنک­کاری با جریان گرم در مجرای گسترش­یافته جانبی، کمتر از سوراخ استوانه­ای خواهد بود. استفاده از مجرای گسترش­یافته جانبی در سرعت­های چرخش صفر، 300 و 500 دور بر دقیقه منجر به افزایش اثربخشی خنک­کاری توربین به ترتیب به میزان 39، 38 و 35 درصد خواهد شد.

کلیدواژه‌ها

مراجع

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سابقه مقاله

  • تاریخ دریافت: 18 دی 1396
  • تاریخ بازنگری: 01 خرداد 1398
  • تاریخ پذیرش: 28 شهریور 1397
  • تاریخ انتشار: 01 آبان 1397

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