اثر میزان پیچش جریان بر احتمال اشتعال موفق و نحوه انتشار هسته اولیه شعله در مشعل پیچشی دوگانه* امیرکبیر

تاجیک, حمیدرضا; تابع جماعت, صادق; فضل الهی قمشی, علیرضا

doi:10.22034/jfnc.2023.180232

اثر میزان پیچش جریان بر احتمال اشتعال موفق و نحوه انتشار هسته اولیه شعله در مشعل پیچشی دوگانه* امیرکبیر

نوع مقاله : مقاله پژوهشی

نویسندگان

¹ دانشگاه امیرکبیر دانشکده هوافضا

² دانشکده مهندسی هوافضا، دانشگاه صنعتی امیرکبیر

10.22034/jfnc.2023.180232

چکیده

در این مقاله، تأثیر میزان پیچش جریان بر الگوی اختلاط، احتمال اشتعال موفق و نحوه انتشار شعله در یک مشعل گازی غیرپیش‌آمیخته با سوخت گاز طبیعی، با استفاده از شبیه‌سازی عددی، تصویربرداری دیجیتال و سرعت بالا، اندازه‌گیری، و مورد بررسی قرار گرفت. نقشه‌های احتمال اشتعال موفق با تغییر موقعیت جایگاه جرقه‌زن در جهات محوری و شعاعی اندازه‌گیری و میدان جریان و الگوی اختلاط با استفاده از شبیه‌سازی عددی بررسی شدند. به منظور بررسی نحوه انتشار هسته اولیه شعله، تصویربرداری دیجیتال با سرعت بالا مورد استفاده قرار گرفت. بر اساس نمودارهای احتمال اشتعال موفق سه ناحیه تعریف شد. اولین ناحیه تحت عنوان ناحیه غیرمؤثر نام‌گذاری شده است که در آن احتمال موفقیت اشتعال کمتر از 20 درصد است. ناحیه دوم ناحیه گذار نام دارد که در آن احتمال اشتعال موفق بین20 درصد تا 80 درصد است و موفقیت اشتعال به مقدار زیاد به موقعیت جرقه‌زن وابسته است. ناحیه سوم ناحیه احتمال بالا است که در آن احتمال موفقیت اشتعال بیشتر از 80 درصد است. نتایج این بررسی نشان می‌دهد که افزایش عدد پیچش جریان باعث افزایش نرخ اختلاط می‌شود، اما باعث بهبود توزیع احتمال اشتعال موفق نمی‌شود. در واقع، با مقادیر عدد پیچش بالا، ناحیه احتمال بالا کوچک می‌شود، اما در جریان‌های با مقادیر عدد پیچش کمتر، ناحیه احتمال بالا توزیع گسترده‌تری در خروجی مشعل داشته، و ویژگی‌های اشتعالی بهتری را شامل می‌شود.

کلیدواژه‌ها

عنوان مقاله [English]

The effect of swirl intensity on the probability of successful ignition and kernel propagation in the Amirkabir double swirl burner.

نویسندگان [English]

Hamid reza Tajik ¹
Sadegh Tabejamaat ²
alireza Fazlollahi-Ghomshi ²

¹ Amirkabir university of Technology Aerospace faculity

² Department of Aerospace Engineering, Amirkabir University of Technology

چکیده [English]

In this article, the influences of swirl intensity on the mixing pattern, successful ignition probability, and flame propagation manner in a non-premixed gas burner with natural gas fuel have been examined by using numerical simulation and high-speed digital imaging. The ignition success probability maps were scrutinized under changing spark location in axial and radial directions. The flow field and mixing pattern were further inspected with the aid of numerical simulation. High-speed digital imaging was employed to study the initial flame kernel propagation. The ignition success probability diagrams defined three areas. The first, dubbed the ineffective zone, holds less than a 20% ignition success chance. The second, known as the transitional zone, has an ignition success probability between 20% and 80%. Ignition success here significantly depends on the spark location. The third area—the high-probability zone—has over an 80% ignition success chance. Findings from the study demonstrate an increased swirl number promotes a higher mixing rate, but it doesn't enhance the distribution of successful ignition probability. Higher swirl numbers actually reduce the high-probability zone, whereas lower swirl numbers allow a broader distribution in the burner outlet and better ignition characteristics.

کلیدواژه‌ها [English]

Ignition
Swirl Flame
Non-Premixed Combustion
Flame Propagation
Numerical Simulation

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