بررسی اثر اعمال شیار محیطی در پوسته بر رفتار جریان و عملکرد یک کمپرسور چرخش معکوس

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار، دانشکده مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران

2 کارشناسی ارشد، دانشکده مهندسی مکانیک، دانشگاه صنعتی اراک، اراک، ایران

چکیده

در این مقاله به بررسی عددی اثر اعمال اصلاح پوسته از نوع شیار محیطی بر بهبود عملکرد یک کمپرسور محوری چرخش معکوس دو‌طبقه گذرصوت پرداخته شده است. نتایج بر اساس شبیه‌سازی عددی جریان لزج به صورت سه‌بعدی با حل معادلات ناویر- استوکس شامل معادله پیوستگی، مومنتوم و انرژی و با استفاده از نرم‌افزار تجاری Ansys CFX ارائه گردیده‌است. در ابتدا، به منظور اعتبارسنجی، نتایج حاصله با نتایج سایر محققان مقایسه گردیده که تطابق خوبی مشاهده می‌گردد. بررسی منحنی عملکرد کمپرسور در دو حالت پوسته صاف و پوسته شیاردار حکایت از افزایش حاشیه استال در این کمپرسور به میزان حدود 8% دارد. مشاهده می‌گردد که اعمال پوسته شیاردار در شرایط نزدیک استال رخداد سلول استال و پخش محیطی و محوری آن را کاهش می‌دهد. با توجه به تضعیف جریان نشتی نوک در حالت پوسته شیاردار، فصل مشترک جریان اصلی و جریان نشتی نوک به سمت پایین‌دست گذرگاه حرکت می‌کند. بعلاوه برخورد جریان نشتی‌نوک و امواج شوک نیز که منجر به تولید افت‌های زیاد می‌شود به پایین دست منتقل می‌گردد.

کلیدواژه‌ها

موضوعات


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