مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی تجربی اثر مشخصه‌های جریان ورودی بر دینامیک و بسامدهای نوسانی شعله پیش‌آمیخته جزئی در راکتور مزو استوانه‌ای شکل با هندسه ثابت

نوع مقاله : پژوهشی اصیل

نویسندگان
علی زرگرباشی 1
سروش صرافان صادقی 1
صادق تابع جماعت 2
1 دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر
2 دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر، تهران
10.52547/mme.22.4.213
چکیده
در پژوهش حاضر، به مطالعه تجربی اثر مشخصه‌های جریان ورودی پیش آمیخته متان-اکسیژن، درون یک راکتور مزو با طول و هندسه ثابت پرداخته شده است. جهت این تحقیق دو نسبت اختلاط جزئی 25% و 50% در نظر گرفته شده و نوع رژیم جریان از نوع آرام بوده است. راکتور مورد استفاده، از جنس کوارتز که به صورت افقی نصب گردیده و مشخصات هندسی آن عبارتند از: قطر داخلی 5 میلی‌متر، ضخامت دیواره 1 میلی‌متر و طول 10 سانتی‌متر می‌باشد. در این تحقیق سعی شده است تا عوامل مؤثر بر رژیم‌های شعله، محدوده تشکیل انواع رژیم‌های شعله، دینامیک شعله، توزیع دمای دیواره خارجی راکتور‌، بسامد و نوسان شعله‌های نوسانی همراه با شدت صوت خاموشی شعله نوسانی تحلیل و گزارش گردد. رژیم اصلی شعله مزوی مشاهده شده طی این پژوهش، شعله نوسانی بوده است. دینامیک این شعله از تغییرات به ترتیب نسبت اختلاط، دبی حجمی اکسیژن و نهایتاً دبی حجمی سوخت، که باعث تغییرات در سرعت جریان ورودی و نسبت هم‌ارزی می‌گردد بیشتر تأثیر می‌پذیرد. بررسی نتایج حاصل از نوسانات صوتی بیانگر افزایش سرعت شعله نوسانی با افزایش دبی حجمی و نسبت اختلاط می‌باشد. صوت خاموشی بلند شعله‌ها هنگام خاموشی از تبدیل بخشی از انرژی حرارتی شعله به صوت، در شعله‌گیر و امواج مرتعش صوتی حاصل از خاموشی شعله و اختلاف سرعت گاز، ناشی می‌شود.
کلیدواژه‌ها
احتراق متان- اکسیژن
راکتور استوانه‌ای ابعاد مزو
احتراق پیش‌آمیخته جزئی
دینامیک شعله
نوسانات صوتی شعله

موضوعات

عنوان مقاله English

Experimental study of the effects of input flow characteristics on flame dynamics and oscillating frequencies of a partially-premixed flame in a fixed-geometry Meso-cylindrical reactor

نویسندگان English

ALi Zargarbashi 1
Soroush Sarrafan Sadeghi 1
Sadegh Tabejamaat 2
1 Department of Aerospace engineering, Amirkabir University of Technology
2 Department of Aerospace engineering, Amirkabir University of Technology
چکیده English

An experimental study on the effects of methane-oxygen partially-premixed input flow characteristics in a mesoscale reactor with constant length and geometry was investigated in the present work. For this research, two partially-premixed ratios of 25% and 50% are considered. The reactor is mounted horizontally, made from quartz material and its geometric characteristics are internal diameter: 5 mm, wall thickness: 1 mm, and length: 10 cm. In this research, we have tried to determine the factors affecting flame regimes. The range of flame regimes, flame dynamics, the outer wall temperature distribution of the reactor, frequency, and oscillation of oscillating flames, along with the intensity of the Repetitive Extinction and ReIgnition (RERI) extinguishing sound, were analyzed and reported. This flame's dynamics are more affected by changes in mixing ratio, oxygen volume flow rate, and fuel volume flow rate, causing changes in inlet flow velocity and equivalence ratio, respectively. Examination of the results of acoustic oscillations indicates an increase in oscillating flame velocity with increasing volumetric flow and mixing ratio. Loud extinguishing sound of flames when quenching is caused by converting a portion of the thermal energy of the flame into sound in the flame arrestor and the acoustic vibration waves resulting from the extinguishing of the flame and the difference in gas velocity.

کلیدواژه‌ها English

Methane-Oxygen Flame
Meso-scale Cylindrical Reactor
Partial Premixed Combustion
Flame Dynamics
Flame Sound Oscillations
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مهندسی مکانیک مدرس
دوره 22، شماره 4
فروردین 1401
صفحه 213-223