مجله مهندسی مکانیک

مجله مهندسی مکانیک

شبیه سازی عددی میدان های جریان و دما در محفظه احتراق توربین گاز V9.24

نوع مقاله : علمی پژوهشی

نویسندگان
1 استادیار، گروه مهندسی انرژی، دانشکده نفت و گاز گچساران، دانشگاه یاسوج، گچساران
2 دانشیار، دانشکده مهندسی مکانیک، دانشگاه تربیت دبیر شهید رجایی، تهران
چکیده
در این پژوهش محفظه احتراق توربین گاز V94.2 از خروجی کمپرسور تا خروجی محفظه احتراق با استفاده از نرم افزار Ansys CFX شبیه سازی شده است. از آنجایی که این محفظه احتراق دارای 8 عدد مشعل بوده که بطور متقارن روی محفظه احتراق قرار گرفته اند، برای کاهش هزینه های سنگین اجرا و زمان یک هشتم محفظه احتراق مدل سازی شده است. برای مدل سازی اغتشاشی از مدل دو معادله ای realizable k-ε و تشعشعی از مدل P-1 استفاده شده است. نتایج نشان داده است که احتراق تنها با استفاده از مدل اتلاف گردابه ایeddy dissipation تشکیل شده است. پس از استقلال حل از شبکه با مقایسه دمای خروجی محفظه حاصل از حل عددی و نتایج تجربی، تطابق خوبی بین این دو نتیجه مشاهده شد. حداکثر خطای حاصل از تحلیل کمتر از 9 درصد بدست آمده است. با بررسی تغییرات فشار هوای ورودی محفظه احتراق روی میدان های جریان و دما مشخص گردید که افزایش فشار هوای خروجی کمپرسور تا حد bar 12 باعث خاموش شدن محفظه احتراق می شود. در نهایت با تغییر دمای ورودی سوخت مشخص گردید که با افزایش دمای سوخت گاز پروفیل دمای خروجی یکنواخت تر شده و میزان آلودگی نیز کاهش می یابد.
کلیدواژه‌ها

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  • تاریخ دریافت 16 مرداد 1404
  • تاریخ بازنگری 13 مهر 1404
  • تاریخ پذیرش 28 مهر 1404