مدل‌سازی ریاضی احتراق ابر نانوذرات با در نظر گرفتن تغییر فاز ذرات در ناحیه واکنش در سیستم احتراقی غیر پیش آمیخته با پیکربندی جریان متقابل

نوع مقاله : مقاله علمی

نویسندگان
1 دانشجوی دکتری، گروه مهندسی مکانیک، دانشگاه آزاد اسلامی، مشهد، ایران
2 دانشیار، گروه مهندسی مکانیک، دانشگاه آزاد اسلامی، مشهد، ایران
3 استادیار، گروه مهندسی مکانیک، دانشگاه آزاد اسلامی، مشهد، ایران
4 استادیار، گروه مهندسی مکانیک، دانشکده فناوری‌های نوین، دانشگاه صنعتی قوچان، قوچان، ایران
چکیده
در این پژوهش به مدل‌سازی احتراق لبه‌ای چندمرحله‌ای ابر ذرات پرداخته شده و تأثیر تغییر نوع سوخت بر تغییر سرعت انتشار شعله سه‌گانه، با در نظر گرفتن تبادل حرارت بین ذره و گاز در ناحیه پیش گرم در نظر گرفته شده؛ با واردکردن اثرات گسستگی ذرات در ناحیه پیش گرم برای دو حالت توزیع یکنواخت و تصادفی ذرات، پروفیل تغییرات دمایی ذرات به‌دست‌آمده است. در این پژوهش به بررسی اثرات اتلاف حرارتی در چهار حالت، با فرض مراحل پیرولیز و خشک‌شدن در یک ناحیه حدی پرداخته شده و معادلات بقای کسر جرمی سوخت گازی، سوخت جامد، اکساینده و بقای انرژی برای چهار حالت فوق حل گردیدند. یک نظریه مناسب برای شعله‌های سه‌گانه در حد انرژی فعال‌سازی بزرگ (β بزرگ) و آزادسازی گرمای معین اما کوچک (α کوچک اما غیر صفر) با استفاده از تقریب مسیر شعله سهموی برای احتراق لبه‌ای چندمرحله‌ای ابر نانوذرات ارائه شد. فرمول­های تحلیلی صریح برای تعیین سرعت انتشار شعله و انحنای شعله سه­گانه ارائه شدند. دما، سرعت و آهنگ­های واکنش به‌صورت تحلیلی بیان شدند. در ادامه اثر تغییرات سوخت از سوخت گازی متان به سوخت جامد نانوذره آهن وارد گردید. این تغییر سوخت نشان می‌دهد که در یک گرادیان کسر مخلوط مساوی سرعت انتشار شعله سه‌گانه برای سوخت گازی متان از سوخت نانوذره آهن بیشتر است. نتایج نشان می‌دهد که افزایش عدد لوئیس سوخت از ۴/۰ تا ۵/۲، مکان تشکیل شعله به‌تدریج از ۵۰۰۳/۰ در عدد لوئیس ۴/۰ به ۱۲۳۳/۰ در عدد لوئیس ۵/۲ می‌رسد. همچنین با افزایش عدد لوئیس اکسیدکننده ۴/۰ تا ۵/۲، مکان تشکیل شعله به‌تدریج از ۰۹۱۶/۰- به ۱۹۸۵/۰ می‌رسد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Mathematical modeling of nanoparticle cloud combustion considering particle phase change in the reaction zone in a non-premixed combustion system with counterflow configuration

نویسندگان English

shayan paknezhad 1
seyed reza saleh 2
vahid nejati 3
seyed mohammad javadi 4
1 Ph.D Student, Department of Mechanical Engineering, Islamic Azad University, Mashhad, Iran
2 Associate professor, Department of Mechanical Engineering, Islamic Azad University, Mashhad, Iran
3 Assistant professor, Department of Mechanical Engineering, Islamic Azad University, Mashhad, Iran
4 Assistant professor, Department of Mechanical Engineering,Faculty of Advance Technologies,Quchan University of Technology, Quchan, IranTechnologies, Quchan University of Technology, Quchan, Iran
چکیده English

The multi-stage edge combustion of super particles has been modeled, and the effect of changing the fuel type on the change in the triple flame propagation velocity has been considered; by introducing the effects of particle disintegration in the preheating zone for two states of uniform and random particle distribution, the temperature change profile of the particles has been obtained. the effects of heat dissipation in four states have been investigated, assuming the pyrolysis in a limit zone. The mass fraction conservation equations of gaseous fuel, solid fuel, oxidant and energy conservation were solved for the above four states. A suitable theory for triple flames in the limit of large activation energy (large β) and definite but small heat release (small α but non-zero) was presented using the parabolic flame path approximation for multi-stage edge combustion of super nanoparticles. analytical formulas were presented to determine the flame propagation velocity and triple flame curvature. The temperature, rate and reaction rates were expressed analytically. the effect of fuel changes from methane gas fuel to solid iron nanoparticle fuel was introduced. This fuel change shows that in an equal mixture fraction gradient; the triple flame propagation velocity is higher for methane gas fuel than iron nanoparticle fuel. with increasing fuel Lewis number from 0.4 to 2.5, the flame formation location gradually increases from 0.5003 at Lewis number 0.4 to -0.1233 at Lewis number 2.5. increasing oxidant Lewis number from 0.4 to 2.5, the flame formation location gradually increases from -0.0916 to 0.1985.

کلیدواژه‌ها English

Nanoparticle cloud combustion
non-premixed combustion
counterflow
particle phase change
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  • تاریخ دریافت 02 مهر 1404
  • تاریخ بازنگری 23 آبان 1404
  • تاریخ پذیرش 29 آذر 1404
  • تاریخ اولین انتشار 29 آذر 1404
  • تاریخ انتشار 01 مرداد 1405