مطالعه اثر استفاده از پره های ایجاد کننده اغتشاش در دودکش یک آبگرمکن گازسوز دیواری بر هیدرو دینامیک جریان و بهبود انتقال حرارت

علوم کاربردی و محاسباتی در مکانیک

مقاله 6، دوره 36، شماره 3 - شماره پیاپی 37، شهریور 1403، صفحه 93-106   

نوع مقاله: مقاله پژوهشی

شناسه دیجیتال (DOI): 10.22067/jacsm.2024.85997.1231

نویسندگان

سید هادی پورحسینی^* ؛ مجتبی باغبان

گروه مهندسی مکانیک، مجتمع آموزش عالی گناباد، گناباد، ایران.

چکیده

در تحقیق حاضر تاثیر استفاده از تولیدکننده‌های گردابه به شکل صفحات نیمدایره‌ای با زاویه‌ و فواصل طولی مختلف بر هیدرودینامیک جریان و آهنگ انتقال حرارت از محصولات احتراق به دیواره دودکش یک آبگرمکن گازسوز دیواری به شیوه آزمایشگاهی و شبیه‌سازی عددی مورد بررسی قرار گرفته و تاثیر تعداد و زاویه پره‌ها بر آهنگ انتقال حرارت به دیواره تعیین شده است. نتایج به دست آمده نشان می‌دهد که قرار دادن پره های ایجاد کننده اغتشاش (تولید کننده گردابه) در دودکش، ضمن کاهش سرعت در ناحیه مرکزی دودکش و افزایش زمان ماند محصولات احتراق، با مغشوش کردن و هدایت جریان به سمت لایه مرزی مجاور دیواره، باعث افزایش انتقال حرارت به دیواره دودکش می‌شود. همچنین آرایش ۷ پره تولید کننده گردابه با زاویه ۵۵ درجه نسبت به راستای طولی بهینه‌ترین حالتی است که علاوه بر افزایش آهنگ انتقال حرارت به دیواره برگشت جریان محصولات احتراق نیز رخ نمی‌دهد. نتایج به دست آمده همچنین نشان می دهد که در آرایش پره بهینه، با تغییر دبی گاز در محدوده ۵/۰ تا ۷۵/۰ متر مکعب بر ساعت، انتقال حرارت به دیواره دودکش به طور متوسط %۲۱ افزایش می‌یابد.

کلیدواژه‌ها

پره تولید کننده گردابه؛ محصولات احتراق؛ دودکش؛ بهبود انتقال حرارت؛ زاویه پره؛ تعداد پره‌ها

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